Time Hopping Patents (Class 375/138)
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Patent number: 8503594Abstract: The present invention includes a method of determining a phase estimate for an input signal having pilot symbols. The method includes receiving a plurality of pilot symbols, and then multiplying two or more pilot symbol slots by corresponding correlator coefficients to correct a phase estimate of the input signal.Type: GrantFiled: September 5, 2012Date of Patent: August 6, 2013Assignee: Broadcom CorporationInventors: Tommy Yu, Amy Gayle Hundhausen
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Patent number: 8498323Abstract: A novel ultra-wide bandwidth receiver structure dubbed the “zonal” receiver is proposed to detect time-hopping ultra-wide bandwidth signals in multiple access interference channels. The zonal receiver outperforms the conventional matched filter ultra-wide bandwidth receiver and the recently proposed soft-limiting ultra-wide bandwidth receiver when only MAI is present, or AWGN is negligible compared to MAI. In more practical mixed MAI-plus-AWGN environments, the zonal ultra-wide bandwidth receiver achieves better performance than the conventional matched filter ultra-wide bandwidth receiver, the recently proposed soft-limiting ultra-wide bandwidth receiver, and the recently proposed adaptive threshold soft-limiting ultra-wide bandwidth receiver. In multipath fading UWB channels, a new Rake receiver based on the zonal UWB receiver design has been proposed, this new Rake receiver can achieve better BER performance than the conventional matched filter based Rake receiver.Type: GrantFiled: March 7, 2008Date of Patent: July 30, 2013Assignee: The Governors of the University of AlbertaInventors: Norman C. Beaulieu, Hua Shao
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Patent number: 8472500Abstract: A method of demodulating at a receiver a plurality of symbols bk comprised in a e.g. UWB, received signal y(t), said receiver having knowledge of a time hopping sequence vector c of the transmitted signal, said method comprising the step of: generating a plurality of frequency-domain samples from the received signal y(t). It further comprises the steps of: from said plurality of frequency-domain samples and said time hopping sequence vector c, applying a coarse estimation stage (7) for identifying the beginning of a first complete symbol (formula A) in an acquisition interval; applying a stage for fine estimation (8) of the time delay (formula B) of each symbol bk, wherein k denotes the k-th symbol, by searching a relative maximum at which a signal energy distribution exceeds a certain threshold Pth; from said fine estimation of the time delay (formula B) of each symbol bk, demodulating (formula C) said symbols bk.Type: GrantFiled: September 26, 2008Date of Patent: June 25, 2013Assignee: Fundacio Privada Centre Tecnologic de Telecomunicacions de CatalunyaInventors: Montserrat Najar Marton, Monica Navarro Rodero
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Patent number: 8462689Abstract: A technique for a time division multiplex system in which access to shared broadcast communication media is granted on a demand basis. Particular connections are assigned slot times at the transmitter based on demand. However, no specific information regarding the assignment of time slots need be communicated to the receivers. The transmit side employs a forward error correction technique followed by multiplication by a cover sequence unique to each connection. All receivers listen to the broadcast transmission channel all of the time. The receiver assigned to each connection decodes the signals in such a manner that only the receiver with the correct cover sequence assigned to a particular connection will successfully decode the data associated with that connection. Data frames that fail the forward error correction process are discarded, and only those frames which are successfully decoded are passed up to a higher layer.Type: GrantFiled: December 22, 2004Date of Patent: June 11, 2013Assignee: Intel CorporationInventors: Kevin P. Johnson, Antoine J. Rouphael, George Rodney Nelson, Jr.
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Patent number: 8442093Abstract: A novel receiver structure is proposed for detecting a time-hopping ultra-wide bandwidth signal in the presence of multiple access interference. The proposed structure achieves better bit error rate performance than the conventional matched receiver when operating in multiple access interference. When operating in a multiple access interference-plus-Gaussian-noise environment, the receiver structure outperforms the conventional matched filter receiver for moderate to large values of signal-to-noise ratio. A receiver structure with adaptive limiting threshold is further proposed to ensure the performance of the soft-limiting receiver always meets or surpasses the performance of the conventional UWB receiver for all values of signal-to-noise ratio.Type: GrantFiled: August 23, 2007Date of Patent: May 14, 2013Assignee: The Governors of the University of AlbertaInventor: Norman C. Beaulieu
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Patent number: 8437416Abstract: A reference signal cyclic shift (CS) is quantized as a combination of a cell specific CS with an outcome of a pseudo-random hopping, and an indication of the cell specific CS is broadcast in the cell. In one embodiment the CS is quantized as a modulo operation on a sum of the cell specific CS, the outcome of the pseudo-random hopping, and a user specific CS, in which case an indication of the user specific CS is sent in an uplink resource allocation and a user sends its cyclically shifted reference signal in the uplink resource allocated by the uplink resource allocation. The CS may also be quantized according to length of the reference signal as cyclic_shift_symbol=(cyclic_shift_value*length of the reference signal)/12; where cyclic_shift_value is between zero and eleven and cyclic_shift_symbol is the amount of CS given in reference signal symbols.Type: GrantFiled: December 28, 2011Date of Patent: May 7, 2013Assignee: Nokia Siemens Networks OyInventors: Esa Tiirola, Kari Hooli, Kari Pajukoski, Klaus Hugl
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Patent number: 8432979Abstract: A cyclic shift of a reference signal is quantized as a combination of a cell specific cyclic shift with an outcome of a pseudo-random hopping, and an indication of the cell specific cyclic shift is broadcast in the cell. In one embodiment the cyclic shift is quantized as a modulo operation on a sum of the cell specific cyclic shift, the outcome of the pseudo-random hopping, and a user specific cyclic shift, in which case an indication of the user specific cyclic shift is sent in an uplink resource allocation and a user sends its cyclically shifted reference signal in the uplink resource allocated by the uplink resource allocation. The cyclic shift may also be quantized according to length of the reference signal as cyclic_shift_symbol=(cyclic_shift_value*length of the reference signal)/12; where cyclic_shift_value is between zero and eleven and cyclic_shift_symbol is the amount of cyclic shift given in reference signal symbols.Type: GrantFiled: April 30, 2008Date of Patent: April 30, 2013Assignee: Nokia Siemens Networks OyInventors: Esa Tiirola, Kari Hooli, Kari Pajukoski, Klaus Hugl
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Patent number: 8416835Abstract: A frequency hopping pattern and a method for transmitting uplink signals using the same are disclosed. A frequency hopping pattern is defined by combination of subband hopping, which is performed over one or more subbands divided from a system band for transmission of the uplink signals, and mirroring where resource blocks within one subband are arranged reversely based on the center of the subband. Sequences as to whether to apply minoring and subband hopping amount are cell-specific random numbers, and are generated independently or in combination.Type: GrantFiled: October 1, 2008Date of Patent: April 9, 2013Assignee: LG Electronics Inc.Inventors: Joon Kui Ahn, Nam Yul Yu, Young Woo Yun, Ki Jun Kim, Hyun Wook Park
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Publication number: 20130077656Abstract: Disclosed are a radio transmission device and a radio transmission method which can reduce a processing amount or a memory amount while maintaining the randomizing effect of other cell interference. When using as a reference signal, a ZC sequence of the sequence length uniquely correlated to a transmission bandwidth of a reference signal, as the transmission bandwidth becomes smaller and the sequence length of the ZC sequence becomes shorter, the sequence is switched at a shorter time interval and as the transmission bandwidth becomes greater and the sequence length of the ZC sequence becomes longer, the switching is performed at a longer time interval. Thus, a reference signal is generated by using the ZC sequence in accordance with the timing into which the reference signal transmission bandwidth and the sequence are switched.Type: ApplicationFiled: November 26, 2012Publication date: March 28, 2013Applicant: PANASONIC CORPORATIONInventor: PANASONIC CORPORATION
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Publication number: 20130028294Abstract: The present invention relates generally to methods for generating a dynamic pilot symbol structure in spread spectrum communication systems, and in particular to the use of pilot symbols by user equipment in channel estimation. In one form, the method includes, allocating basic pilot symbols at the beginning of each data chunk and spread over the plurality of sub-carrier frequencies; and selectively replacing data symbols in each data chunk with adaptive pilot symbols according to the speed of the user equipment.Type: ApplicationFiled: October 2, 2012Publication date: January 31, 2013Applicant: NEC CORPORATIONInventor: NEC CORPORATION
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Patent number: 8363693Abstract: In a wireless network system, the nodes share a frequency hopping pattern. A method comprises providing a channel list table which includes, for each transmitting node, one or more channel lists, each channel list containing conditions of the channels of the shared frequency hopping pattern that include at least one available channel for communications with a target node; selecting a channel of a next allocated time slot from the shared frequency hopping pattern at the transmitting node; selecting the channel list for the target node from the channel list table, to which the transmitting node transmits; checking if the selected channel is available based on the selected channel list; setting the selected channel at the transmitting node if the selected channel is available; and calculating a substitute channel from the channel list if the selected channel is not available.Type: GrantFiled: April 16, 2010Date of Patent: January 29, 2013Assignee: Hitachi, Ltd.Inventor: Ryosuke Fujiwara
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Publication number: 20130010833Abstract: Provided is a terminal apparatus that can suppress the increase in interference between pilot signals in the same slot, while also suppressing the degradation of the flexibility to design cell cluster structures. When hopping information indicates an inter-slot hopping, a mapping unit (212) arranges a first pilot sequences in which a group to which the sequences used in respective slots belong varies on a slot-by-slot basis. When the hopping information indicates an inter-subframe hopping, the mapping unit (212) arranges a second pilot sequences in which a group to which the sequences used in respective slots belong varies on a subframe-by-subframe basis. The sequence group to which the sequences used in any one of the subframes in the second pilot sequences belong is identical with the sequence group to which the sequence used in any one of the slots included in that one subframe in the first pilot sequences belongs.Type: ApplicationFiled: March 17, 2011Publication date: January 10, 2013Applicant: PANASONIC CORPORATIONInventors: Yoshihiko Ogawa, Takashi Iwai, Akihiko Nishio, Seigo Nakao
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Patent number: 8311076Abstract: The invention relates to a method for transmitting call data in a digital wireless communication network, said call data being transmitted over at least one radio frequency channel in a sequence of timeslots. Call data are transmitted in the network using timeslot hopping in which the call data of each user of the network are transmitted with a different timeslot hopping sequence.Type: GrantFiled: February 3, 2009Date of Patent: November 13, 2012Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Stefan Eriksson Lowenmark, Miguel Lopez, Marten Sundberg
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Patent number: 8243749Abstract: A wireless communication device, and a wireless communication system and a method of beamforming is presented. The wireless communication system and/or device includes a beamformee unit, a beamformer unit and two or more antennas to transmit the data unit and the protocol data unit according to the beamformee and the beamformer units, respectively. The beamformee conveys feedback information by a data unit in one of the feedback positions that include an immediate feedback position, an aggregated feedback position and a delayed feedback position. The beamformer unit generates a protocol data unit including a control field that includes one of the feedback request information types which is selected from a Channel State Information or uncompressed Steering Matrix or compressed Steering Matrix to request feedback from a remote communication device.Type: GrantFiled: December 27, 2006Date of Patent: August 14, 2012Assignee: Intel CorporationInventors: Gal Basson, Solomon B. Trainin
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Patent number: 8243779Abstract: In a wireless communications system which hops from frequency to frequency, rather than hopping according to a fixed dwell interval and a pre-determined pseudo-random hop sequence, a quality-based frequency hopping methodology is defined in which a new frequency is hopped to when the channel quality on the current frequency degrades based on the measured value or values of one or more predetermined metrics that are associated with channel quality. When triggered to hop to a next frequency, the hop-to-frequency may be the next frequency in the pseudo-random hop sequence known to both the transmitter and receiver or, in order to improve the reliability of communications, may be determined based on channel quality measurements on different potential hop-to-frequencies.Type: GrantFiled: April 29, 2005Date of Patent: August 14, 2012Assignee: Alcatel LucentInventors: Krishna Balachandran, Joseph H Kang
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Patent number: 8238406Abstract: A method consisting of determining, by a symbol mapper, whether a previous burst position is below a threshold, wherein the previous burst position defines a location within a previous symbol. A determination that the previous burst position is below the threshold causes generating, by the symbol mapper, a random number in a complete set, the random number defines a current burst position, the current burst position defines a location within a current symbol and sending or receiving a value in the current burst position. A determination that the previous burst position is above the threshold causes generating, by the symbol mapper, a random number in a reduced set, the random number defines a modified current burst position, the modified current burst position defines a location within the current symbol and sending or receiving a value in the modified current burst position.Type: GrantFiled: March 25, 2010Date of Patent: August 7, 2012Assignee: Texas Instruments IncorporatedInventors: June Chul Roh, Anuj Batra
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Patent number: 8213483Abstract: Systems and methodologies are described that facilitate defining and utilizing hopping patterns to transmit broadband pilot signals in a wireless communications network. Portions of bandwidth can be dedicated to transmitting the broadband pilot data, and patterns can be utilized to hop across frequencies in given time periods to effectively utilize the entire dedicated bandwidth. Moreover, the periodicity for transmitting the data is configurable to allow devices requiring additional scheduling (e.g., high activity devices) to transmit the broadband pilot data more frequently. The hopping patterns can also hop across cyclic shifts of the patterns to provide optimum diversity for transmitting broadband pilot signals.Type: GrantFiled: February 5, 2008Date of Patent: July 3, 2012Assignee: QUALCOMM IncorporatedInventor: Durga Prasad Malladi
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Patent number: 8204097Abstract: Provided is an ultra-wideband pulse generator using a digital scheme. The ultra-wideband pulse generator and a method for generating an ultra-wideband pulse therein can easily generate various ultra-wideband pulses having a random center frequency and bandwidth according to digital control schemes in a pulse-based ultra-wideband wireless communication system.Type: GrantFiled: June 26, 2007Date of Patent: June 19, 2012Assignee: Electronics and Telecommunications Research InstituteInventors: Mi-Kyung Oh, Jae-Young Kim, Kwang-Roh Park
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Patent number: 8203433Abstract: The invention relates to a method for implementing an RFID network, comprising the following steps: each read-write station transmits at least one test signal; each read-write station (1, 2, 3, 11, N0-N17) receives the (receivable) test signals of neighboring read-write stations (1, 2, 3, 11, N0-N17), said signals comprising a station address, a frequency channel number and a measured signal intensity of each receivable neighboring read-write station (1, 2, 3, 11, N0-N17); a network structure (110) comprising structure data and a co-ordination plan comprising co-ordination data are calculated using a number of time slots (21, 31, 41) and a number of frequency channels (20, 30, 40), a service frequency channel (reader service channel, RSK) and/or a service time slot (reader service time, RST) being defined and used by the read-write stations (1, 2, 3, 11, N0-N17) for service purposes; and at least corresponding structure data and co-ordination data for an organized, synchronous network operation is transmittedType: GrantFiled: September 22, 2006Date of Patent: June 19, 2012Assignee: Intermec IP Corp.Inventors: Patrick Deuber, Roland Kueng
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Publication number: 20120128035Abstract: Low-power transmitter and/or receiver devices are provided by sacrificing time and/or frequency diversity in exchange for lower power consumption. When channel conditions indicate that time and/or frequency spreading are unnecessary for transmissions, a transmitter may enter into a power-conservation mode in which transmissions are performed using a time gating scheme or a time repetition scheme. In the time gating scheme, symbols are transmitting just once, rather than a plurality of times, but with increased transmission power. In the time repetition scheme, copies of the same symbol are transmitted a plurality of times on the same frequency on different symbol transmission periods, instead of being retransmitted on different frequencies on different symbol transmission periods. Consequently, the symbol can be generated once and stored for subsequent retransmission, thereby allowing some of the transmitter/receiver chain components can be operated at a lower duty cycle or processing speed to conserve power.Type: ApplicationFiled: January 24, 2012Publication date: May 24, 2012Applicant: QUALCOMM INCORPORATEDInventors: Samir Soliman, Ozgur Dural, Krishnan Rajamani, Rabih Chrabieh
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Patent number: 8184674Abstract: A low-power wireless network involves a master and a plurality of RF-enabled fluorescent lamp starter units. In each of a plurality of intervals, a starter wakes up and listens for a beacon, regardless of whether a beacon is transmitted during that interval or not. The starter operates in a low power sleep mode during the majority of the interval. The master can transmit during the beacon slot time of any interval, but typically only transmits frequently enough to maintain starter synchronization. If the master wishes to communicate with the starters with reduced latency, then the master can transmit a beacon in the next interval. Beacon slot time is varied within the interval (for example, from interval to interval or from group of intervals to group of intervals) in a pseudo-random time-hopping fashion known to both the starters and the master, thereby reducing persistence of collisions with similar networks.Type: GrantFiled: September 30, 2009Date of Patent: May 22, 2012Assignee: IXYS CH GmbHInventor: Steven M. Pope
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Patent number: 8160626Abstract: A method of operating a Data Base (DB) server for storing spectrum condition information on a licensed system in a Cognitive Radio (CR)-based wireless communication system and a CR-based wireless communication system are provided. The method includes determining changes in the spectrum condition information on the licensed system, recalculating maximum Equivalent Isotropically Radiated Power (EIRP) allowed for each channel of CR-based devices registered in a list, and transmitting information regarding the recalculated maximum allowed EIRP.Type: GrantFiled: May 7, 2009Date of Patent: April 17, 2012Assignee: Samsung Electronics Co., LtdInventors: Cheng Shan, Eun-Taek Lim, Jung-Soo Woo, Geun-Ho Lee, Sang-Bum Kim, Yong-Ho Park
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Patent number: 8155167Abstract: A system and method for low complexity frequency hopping simulation for communication device performance testing is disclosed. A baseband and channel model combination in a baseband processing module (602) of a testing system (600) reduces the required number of computations while retaining accuracy. A simulated channel is generated (612) with a bandwidth required for frequency hopping, and the hopping is simulated by shifting (614) the channel (612) instead of the signal (606). Signal attenuation by the shifted channel (615) is modeled in the baseband processing module (602), and the resulting simulated signal (610) is then up-sampled (628) to the proper frequency for output to the test device (634).Type: GrantFiled: May 2, 2007Date of Patent: April 10, 2012Assignee: Motorola Mobility, Inc.Inventors: Alexandre Ribeiro Dias, Eric Marlot
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Patent number: 8130813Abstract: A method and apparatus for transmitting beacon signals in a wireless communications network. For a given cell site, a single frequency may be used for the beacon signal by assigning different beacon signal time slots to different sectors of the cell site. During one time slot, the beacon signal is transmitted to one of the sectors, and during another one of the time slots, the beacon signal is transmitted to a different one of the sectors. Because a single frequency can be used for all of the sectors of a cell site, more frequencies are available for other purposes, such as for user traffic, for example. The invention improves spectral efficiency, reduces adjacent channel interference and co-channel interference and allows power consumption to be controlled.Type: GrantFiled: May 1, 2008Date of Patent: March 6, 2012Assignee: AT & T Mobility II LLCInventors: Ming-Ju Ho, Ali Jabbary, Ramzi Barghouthi
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Patent number: 8130717Abstract: Provided are a random access method of a mobile station and a mobile communication device performing the same. The mobile station can obtain a diversity gain without a Random Access Channel (RACH) burst collision by hopping according to a cell group in a frequency domain and transmitting a random access when random access resources are used between neighboring cells and detect an RACH even with low transmission power by applying switching diversity together with the frequency hopping.Type: GrantFiled: July 30, 2007Date of Patent: March 6, 2012Assignees: Electronics and Telecommunications Research Institute, Samsung Electronics Co., Ltd.Inventors: Hyoseok Lee, Il-Gyu Kim, Hyeong-Geun Park, Kapseok Chang, Young-Jo Ko, Young-Hoon Kim, Seung-Chan Bang
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Patent number: 8116349Abstract: A method of multiple access communication in a centralized network is based on an ultra wideband impulse physical layer allowing code-based multiple access. Each user is associated with a code, and the transmission is performed in an asynchronous manner in a propagation medium with multiple paths. It is characterized in that a criterion is established so as to find the codes of the various users making it possible to minimize the variance of the multi-user interference at the output of a linear receiver.Type: GrantFiled: February 7, 2007Date of Patent: February 14, 2012Assignee: ThalesInventors: Christophe Le Martret, Anne-Laure Deleuze, Philippe Ciblat
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Patent number: 8102926Abstract: A method and apparatus for communication in a system employing differing transmission protocols. It is determined whether a first time slot of one transmission protocol is adjacent to a second time slot of another transmission protocol, and if a first symbol within the first time slot is adjacent to a second symbol of the second time slot. A pilot power and/or a number of pilot sub-carriers or tones of the first symbol is increased and channel estimation is performed on the first symbol.Type: GrantFiled: September 23, 2005Date of Patent: January 24, 2012Assignee: QUALCOMM IncorporatedInventors: Ashok Mantravadi, Durga Prasad Malladi, Avneesh Agrawal, Anastasios Stamoulis
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Publication number: 20120014414Abstract: Provided are a node device of a beacon-enabled Wireless Personal Area Network (WPAN) managing a channel resource and a method thereof. The node device may generate a pseudo random binary sequence (PRBS) and generate a hopping sequence based on a number of available channels using the PRBS, thereby generating a hopping sequence having a characteristic of pseudo randomness and selecting a channel to be hopped, using the hopping sequence.Type: ApplicationFiled: July 13, 2011Publication date: January 19, 2012Applicant: Electronics and Telecommunications Research InstituteInventors: Wun Cheol JEONG, Chang Sub SHIN, Tae Joon PARK, Hoyong KANG, Se Han KIM, In Hwan LEE, Cheol Sig PYO
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Publication number: 20110292972Abstract: System and method are disclosed for synchronization of a transmitting device and a receiving device that communicate with each other via pulse modulation. The synchronization technique entails the transmitting device sending one or more quasi-periodic pulse sequences to the receiving device. A quasi-periodic pulse sequence is based on a substantially periodic pulse sequence, and may include some non-periodic pulses or not include some periodic pulses. The transmitting device may transmit frames each including a preamble that comprises one or more quasi-periodic pulse sequences, and a data payload that may comprise data. The receiving device receives the signal, generates samples of the signal, and detects the quasi-periodic pulse sequences in the received signal by analyzing samples based on a sample associated with a pulse and the period associated with the substantially periodic pulse sequence.Type: ApplicationFiled: September 21, 2010Publication date: December 1, 2011Applicant: QUALCOMM IncorporatedInventors: Petru Cristian Budianu, Jun Shi, David Jonathan Julian
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Publication number: 20110280283Abstract: A signal processing arrangement is designed to process a digitalized phase-modulated and/or digitalized spreaded input signal (1) and has a complex channelizer (2) which despreads and/or demodulates the input signal (1) in the time range on the basis of a folding operation.Type: ApplicationFiled: January 18, 2010Publication date: November 17, 2011Inventors: Lutz Braungardt, Martin Opitz, Thomas Reisinger
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Patent number: 8059710Abstract: A space-time coding method for a UWB transmission system comprising at least two radiated elements. The method codes a block of information symbols S=(a1, a2 . . . , ap,)) belonging to an M-PPM modulation or M-PPM-M?-PAM composite modulating alphabet with M being even, into a sequence of vectors (si,j, ?si,j), the components of a vector being intended to modulate a UWB pulse signal for a radiative element of said system and for a given transmission interval (Tƒ).Type: GrantFiled: October 1, 2007Date of Patent: November 15, 2011Assignee: Commissariat a l'Energie AtomiqueInventor: Chadi Abou Rjeily
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Publication number: 20110274141Abstract: A method and apparatus of synchronizing pulsed wireless communication between a first transceiver and a second transceiver. It includes the steps of transmitting a pulse signal from a first transceiver to a second transceiver; transmitting a reflection signal from the second transceiver to the first transceiver if the transmitted pulse signal is received at the second transceiver within an active reception period of the second transceiver; and detecting the reflection pulse to determine synchronization between the first transceiver and the second transceiver. Embodiments of the invention also relate to an apparatus for carrying out the method. In one embodiment, the reflection signal is generated by a super-regenerative oscillator.Type: ApplicationFiled: October 22, 2008Publication date: November 10, 2011Applicants: Nokia Corporation, Commissariat A L'Energie ATomique Et Aux Energies AlternativesInventors: Joni Jantunen, Jarmo Arponen, Iiro Janturen, Michaël Pelissier, Bertrand Gomez, Jaakko Varteva
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Publication number: 20110268158Abstract: Systems and methods for supporting more flexible coverage areas and spatial capacity assignments using satellite communications systems are disclosed. Antenna elements are arranged in one or more phased arrays. The phased arrays may be used to receive uplink communications, transmit downlink communications, or both receive uplink communications and transmit downlink communications. Beam forming networks (BFN's) associated with the one or more phased arrays may be dynamic, allowing for movement of the locations of the receive beams, the transmit beams, or both the receive beams and transmit beams. The beams may then “hop” from location to location according to a predefined or dynamic hopping pattern. In some embodiments, the hopping patterns may be time-varying and may be changed or updated on-the-fly.Type: ApplicationFiled: April 29, 2011Publication date: November 3, 2011Applicant: ViaSat, Inc.Inventors: Mark J. Miller, Charles N. Pateros
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Publication number: 20110261862Abstract: Methods of detecting a pulse sequence in a received signal are disclosed, each of which entails operating on samples of the received signal. One method entails determining a correlation of samples with a reference sequence, and detecting the pulse sequence based on the correlation. Another method entails selecting a reference sample associated with a pulse, and detecting the pulse sequence by analyzing samples based on one or more lengths of a time hopping interval and the reference sample. Another method entails selecting a reference sample associated with non-restricted time hopping intervals, and detecting the pulse sequence by analyzing samples that are based on substantially one or more lengths of a half pulse interval and the reference sample. Further, disclosed is a method of determining a timing drift by selecting samples, determining a time delay between the selected samples, and determining the timing drift based on the determined time delay and an expected time delay.Type: ApplicationFiled: April 23, 2010Publication date: October 27, 2011Applicant: QUALCOMM IncorporatedInventors: Petru Cristian Budianu, Jun Shi, Amal Ekbal, David Jonathan Julian
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Publication number: 20110249703Abstract: A method of demodulating at a receiver a plurality of symbols bk comprised in a e.g. UWB, received signal y(t) said receiver having knowledge of a time hopping sequence vector c of the transmitted signal, said method comprising the step of: generating a plurality of frequency-domain samples from the received signal y(t). It further comprises the steps of: from said plurality of frequency-domain samples and said time hopping sequence vector c, applying a coarse estimation stage (7) for identifying the beginning of a first complete symbol (formula A) in an acquisition interval; applying a stage for fine estimation (8) of the time delay (formula B) of each symbol bk, wherein k denotes the k-th symbol, by searching a relative maximum at which a signal energy distribution exceeds a certain threshold Pth; from said fine estimation of the time delay (formula B) of each symbol bk, demodulating (formula C) said symbols bk.Type: ApplicationFiled: September 26, 2008Publication date: October 13, 2011Applicant: FUNDACIO PRIVADA CENTRE TECNOLOGIC DE TELECOMUNICACIONS DE CATALUNYAInventors: Montserrat Najar Marton, Monica Navarro Rodero
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Publication number: 20110206086Abstract: Systems and/or methods are disclosed for generating a waveform that comprises a plurality of elements by using a Fourier transform and/or an inverse Fourier transform. The waveform that comprises the plurality of elements may be transmitted by transmitting, sequentially in time, the plurality of elements. In some embodiments, the Fourier transform and/or inverse Fourier transform comprises a Fast Fourier Transform and/or Inverse Fast Fourier Transform and the waveform that comprises the plurality of elements may be transmitted by using, sequentially in time, the plurality of elements to modulate a single carrier frequency.Type: ApplicationFiled: May 5, 2011Publication date: August 25, 2011Inventor: Peter D. Karabinis
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Publication number: 20110128994Abstract: A novel ultra-wide bandwidth receiver structure dubbed the “zonal” receiver is proposed to detect time-hopping ultra-wide bandwidth signals in multiple access interference channels. The zonal receiver outperforms the conventional matched filter ultra-wide bandwidth receiver and the recently proposed soft-limiting ultra-wide bandwidth receiver when only MAI is present, or AWGN is negligible compared to MAI. In more practical mixed MAI-plus-AWGN environments, the zonal ultra-wide bandwidth receiver achieves better performance than the conventional matched filter ultra-wide bandwidth receiver, the recently proposed soft-limiting ultra-wide bandwidth receiver, and the recently proposed adaptive threshold soft-limiting ultra-wide bandwidth receiver. In multipath fading UWB channels, a new Rake receiver based on the zonal UWB receiver design has been proposed, this new Rake receiver can achieve better BER performance than the conventional matched filter based Rake receiver.Type: ApplicationFiled: March 7, 2008Publication date: June 2, 2011Applicant: THE GOVERNORS OF THE UNIVERSITY OF ALBERTAInventors: Norman C. Beaulieu, Hua Shao
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Publication number: 20110122924Abstract: A method is provided that determines a delay and phase of an ultra-wide band signal in a communication system using a single correlator. A pulse search is executed that includes correlating a signal template with a UWB signal and sampling a preamble of the UWB signal at various time positions until a pulse in the signal template matches a pulse in the preamble. A chip boundary at which the pulse in the preamble is detected is identified using the signal template. A code search is executed for determining the correct phase of the received signal. The code search utilizes a plurality of phases having a same time-hopping sequence as the received signal. Each pulse of the phases is positioned at the determined chip boundary within each respective chip pulse position. Chips pulse positions of the phases are compared with the chip pulse positions of the UWB signal for determining a phase match.Type: ApplicationFiled: November 24, 2009Publication date: May 26, 2011Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: Xiangming Kong, Mohiuddin Ahmed
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Patent number: 7924958Abstract: An apparatus and method for transmitting and receiving a data stream in a multi-antenna system, in which a plurality of data streams are received, a plurality of code symbol sequences are generated by precoding the plurality of data streams, the code symbol sequences being mapped to the transmit antennas in a one-to-one correspondence, the code symbol sequences being delayed by delay times for the mapped transmit antennas, and the delayed code symbol sequences are transmitted through the mapped transmit antennas.Type: GrantFiled: February 28, 2007Date of Patent: April 12, 2011Assignee: Samsung Electronics Co., Ltd.Inventor: Duck-Dong Hwang
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Patent number: 7916778Abstract: A method analyzes a radio signal received via a wireless channel. The radio signal includes multiple frames representing a transmitted symbol. Energy of each frame is sampled during multiple of non-overlapping time windows. The sampled energies are stored in an energy matrix indexed by the number of frames and the number of time windows in each frame to analyze the radio signal.Type: GrantFiled: April 22, 2005Date of Patent: March 29, 2011Assignee: Mitsubishi Electric Research Labs, Inc.Inventors: Zafer Sahinoglu, Fatih M. Porikli
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Publication number: 20110002362Abstract: A communications system includes RF hardware (104) configured for receiving an input data signal includes a modulated carrier encoded with information symbols and modulated using a sequence of discrete time chaotic samples. The system also includes a chaotic sequence generator (340) configured for generating the sequence of discrete-time chaotic samples and a correlator (328). The correlator is configured for synchronizing the input data signal with the sequence of discrete-time chaotic samples and obtaining normalization factor values for each of the information symbols based on comparing a received symbol energy for the information symbols and a symbol energy of the discrete-time chaotic samples associated with the duration of transmission of the information symbols.Type: ApplicationFiled: July 1, 2009Publication date: January 6, 2011Applicant: Harris CorporationInventors: Alan J. Michaels, David B. Chester
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Patent number: 7822155Abstract: Methods and apparatus that improve interference (I) estimation in CDMA systems in which the DPCH is sorted under a scrambling code different from the scrambling code of a channel such as the CPICH are described. In such systems, DPCH I-estimation cannot be done by measuring on the CPICH and transforming to the DPCH due to the different interference situations on the two channels. Instead, the DPCH interference is estimated by using knowledge of empty channelization codes in the alternative or secondary scrambling code that can be used for I estimation, or using symbols (e.g., control symbols on the DPCCH) on the DPCH, or searching for an empty channelization code and using a found empty code for I-estimation. These techniques improve the SIR estimate in comparison to prior techniques and hence also improve the performance of power control, increasing the system's capacity.Type: GrantFiled: November 4, 2003Date of Patent: October 26, 2010Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Bengt Lindoff, Johan Nilsson, Torgny Palenius
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Publication number: 20100246639Abstract: A method consisting of determining, by a symbol mapper, whether a previous burst position is below a threshold, wherein the previous burst position defines a location within a previous symbol. A determination that the previous burst position is below the threshold causes generating, by the symbol mapper, a random number in a complete set, the random number defines a current burst position, the current burst position defines a location within a current symbol and sending or receiving a value in the current burst position. A determination that the previous burst position is above the threshold causes generating, by the symbol mapper, a random number in a reduced set, the random number defines a modified current burst position, the modified current burst position defines a location within the current symbol and sending or receiving a value in the modified current burst position.Type: ApplicationFiled: March 25, 2010Publication date: September 30, 2010Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: June Chul ROH, Anuj BATRA
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Patent number: 7787516Abstract: A wireless communication system and a method for reducing a ranging time. The communication system includes a main synchronization block group which processes the transceived signal and determines whether the transceived signal is a signal desired by a transmitting device when a receiving device re-transmits the transceived signal to the transmitting device; a ranging block which measures a distance between the transmitting device and the receiving device using a ranging signal when the transceived signal is the desired signal of the transmitting device based on the determination of the main synchronization block group and when the transceived signal is the ranging signal; and a symbol synchronization block which detects a start point and an end point of a symbol forming the signal when the transceived signal from the receiving device is a data communication signal. Accordingly, the fast ranging is feasible and channel occupation time can be shortened.Type: GrantFiled: August 10, 2006Date of Patent: August 31, 2010Assignee: Samsung Electronics Co., Ltd.Inventors: Jae-hyon Kim, Young-hwan Kim, Seong-soo Lee, Joonhyuk Kang, Jaehwan Kim, Yungil Kim
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Patent number: 7773659Abstract: Disclosed herein is an Ultra WideBand (UWB) M-ary Code Shift Keying (MCSK)/Binary Pulse Position Modulation (BPPM) wireless communication system and method. The system includes a transmitter and a receiver. The transmitter selects a specific TH code using MCSK according to an additional data stream, performs BPPM on a desired signal according to the selected TH code, and transmits the modulated signal via a channel. The receiver receives the signal transmitted from the transmitter via the channel, and estimates the transmitted signal, which is transmitted from the transmitter, through detection of a Maximum Likelihood (ML) sequence.Type: GrantFiled: June 20, 2005Date of Patent: August 10, 2010Assignees: INHA-Industry Partnership Institute, Simon Fraser UniversityInventors: Dong In Kim, Serhat Erkucuk, Kyung Sup Kwak
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Patent number: 7769074Abstract: Methods and systems for detecting and synchronizing to frequency hopped packets are presented. A technique for detecting a transmitter frequency hopping pattern includes receiving a packet of preamble symbols respectively transmitted over multiple frequency sub-bands according to the transmitter frequency hopping pattern, and partitioning predetermined frequency hopping patterns into disjoint groups of patterns, each group of patterns having an associated periodicity of the received preamble symbols. A group of patterns is selected by comparing a correlation metric of two received preamble symbols for each of the associated periodicities in a first selected frequency sub-band, and a pattern from the selected group of patterns is selected based on a timing of a detected first peak of the correlation metric in a second selected frequency sub-band.Type: GrantFiled: March 8, 2006Date of Patent: August 3, 2010Assignee: Renesas Technology CorporationInventors: Yves-Paul Nakache, Nikolaus Lehmann
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Publication number: 20100183050Abstract: A low profile low cost mobile in-motion antenna system for satellite TV reception.Type: ApplicationFiled: March 7, 2010Publication date: July 22, 2010Applicant: RAYSAT INCInventors: Yoel Gat, Raz Shani, Danny Spirtus, Robert Yip, Mario Gachev
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Publication number: 20100172393Abstract: An apparatus for communications configured to support first and second spread-spectrum channels, each of the first and second channels being based on a different pseudorandom sequence. The apparatus further configured to select one of the first and second channels for communications to avoid a collision of information that would otherwise occur based on their pseudorandom sequences.Type: ApplicationFiled: January 6, 2009Publication date: July 8, 2010Applicant: QUALCOMM IncorporatedInventors: Zhanfeng Jia, David Jonathan Julian, Amal Ekbal
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Patent number: 7738529Abstract: There is provided with there is provided with a wireless communication method using a frequency hopping scheme, which performs wireless communication with a different wireless communication apparatus by using a plurality of frequency bands, including: measuring interference quantities showing strength of interference signals in respective frequency bands; selecting a hopping pattern from a plurality of hopping patterns each having hopping densities set for the respective frequency bands on the basis of the interference quantities in the respective frequency bands, the hopping densities being the number of times that transmission is performed per unit time in the respective frequency bands; notifying the different wireless communication apparatus of the selected hopping pattern; and communicating with the different wireless communication apparatus by using the selected hopping patter.Type: GrantFiled: August 31, 2006Date of Patent: June 15, 2010Assignee: Kabushiki Kaisha ToshibaInventor: Tomoya Horiguchi
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Patent number: 7729407Abstract: A transmitted reference ultra-wide band communication signal embodied in an electromagnetic wave and configured to communicate a data value includes a first frame having a first reference pulse and a first data pulse. The first reference pulse has a reference polarity and the first data pulse has a data polarity. The first reference pulse is separated from the first reference pulse by a delay time. The reference polarity is set based on a predetermined reference value and a first pseudo-random polarity code sequence, and the data polarity is set based on the data value and a second pseudo-random polarity code sequence. A receiver configured to receive the signal, a transmitter configured to transmit the signal, and a system of transmitters and receivers are also provided.Type: GrantFiled: February 10, 2005Date of Patent: June 1, 2010Assignee: Renesas Technology Corp.Inventors: Zafer Sahinoglu, Sinan Gezici