By Signal Quality (e.g., Signal To Noise Ratio) Patents (Class 455/135)
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Patent number: 8494466Abstract: A method and apparatus of selecting which of a plurality of receiver chains of a mobile unit to receive wireless signals, is disclosed. One method includes measuring a first receive signal quality while all of the plurality of receiver chains are receiving wireless signals, and measuring a second receive signal quality while a subset of the plurality of receiver chains are receiving wireless signals. The subset of the plurality of receiver chains are selected to receive wireless signal unless the first receive signal quality is a threshold better than the second receive signal quality. If the first receive signal quality is a threshold better than the second receive signal quality then all the plurality of receiver chains are selected to receive wireless signals.Type: GrantFiled: March 26, 2008Date of Patent: July 23, 2013Assignee: Broadcom CorporationInventors: Louay Jalloul, Sam P. Alex, Soumen Chakraborty, Sindhu Verma, Manish Airy, Anuj Puri
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Patent number: 8493922Abstract: A method of operating a wireless device includes determining a preferred subset of bands of a set of bands for communicating with a first node, communicating a scheduling request with the first node, and determining whether to schedule a data transmission on each band of the set of bands based on the preferred subset of bands and the scheduling request.Type: GrantFiled: July 8, 2010Date of Patent: July 23, 2013Assignee: QUALCOMM IncorporatedInventors: Junyi Li, Saurabh Tavildar, Nilesh Khude, Thomas Richardson, Rajiv Laroia
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Patent number: 8489036Abstract: A mobile phone to transmit and receive a radio frequency signal through a first antenna and a second antenna in a radio communication system includes a first radio frequency signal receiving unit to convert the radio frequency signal received through the first antenna into a baseband signal to be transmitted to a controller, a second radio frequency signal receiving unit to convert the radio frequency signal received through the second antenna into a baseband signal to be transmitted to the controller, and a radio frequency signal transmitting unit to convert a baseband signal transmitted from the controller into a radio frequency signal, to distribute the radio frequency signal, and to selectively output the distributed radio frequency signal to the first antenna and the second antenna.Type: GrantFiled: August 24, 2012Date of Patent: July 16, 2013Assignee: Pantech Co., Ltd.Inventors: In Kwang Kim, Hong Woo Lee
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Patent number: 8483304Abstract: A radio transmitter of the present invention includes a scheduler for assigning a communication time or a communication frequency to each radio receiver based on quality information of a received signal transmitted by the radio receiver, a transmission circuit controller for transmitting either a frequency diversity region or a multiuser diversity region to be selected with respect to each chunk, and a transmission circuit for applying different delay times to signals of a plurality of transmission antennas based on a transmission result of the transmission circuit controller.Type: GrantFiled: October 31, 2006Date of Patent: July 9, 2013Assignee: Sharp Kabushiki KaishaInventors: Kimihiko Imamura, Ryota Yamada
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Patent number: 8483742Abstract: A method and apparatus for controlling uplink power in a wireless communication system are disclosed. The uplink power controlling method includes receiving target Signal-to-Interference plus Noise Ratio (SINR) parameters and an uplink noise and interference level from a base station, determining an uplink power based on a target SINR and an estimated average power level of noise and interference of a user equipment, the target SINR being determined using the target SINR parameters and the estimated average power level of noise and interference of the user equipment being calculated using the uplink noise and interference level, and receiving at least one of selectively transmitted first and second offsets from the base station and adjusting the uplink power based on the received at least one of the first and second offsets.Type: GrantFiled: July 26, 2010Date of Patent: July 9, 2013Assignee: LG Electronics Inc.Inventors: Dong Cheol Kim, Wook Bong Lee, Han Gyu Cho, Jin Sam Kwak, Bin Chul Ihm
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Patent number: 8483745Abstract: The present invention pertains to the technology for avoiding interference between adjacent frequencies occurring on cell boundaries or sector boundaries in a mobile wireless communication system using an OFDMA (Orthogonal Frequency Division Multiple Access) scheme. There are a single sector mode of no collaboration between sectors; a sector selection mode of collaborating between sectors to transmit with a specified frequency resource from only one sector, and a collaboration mode of collaborating between sectors to transmit signals from both sectors. Any of the three modes is selected on the basis of measurement results of RSRP (Reference Signal Received Power) reported from a mobile station.Type: GrantFiled: April 23, 2010Date of Patent: July 9, 2013Assignee: Hitachi, Ltd.Inventors: Koichiro Furueda, Mikio Kuwahara
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Patent number: 8467462Abstract: To suppress effects produced on other terminals as much as possible, while obtaining the advantage of soft-combining. A multicarrier receiving apparatus that receives a packet comprised of at least a propagation path estimation symbol and a scrambled information symbol to demodulate, and has propagation path estimating sections 3-a and 3-b that respectively estimate propagation paths of radio signals transmitted from a plurality of transmission antennas, scramble multiplying sections 5-a and 5-b that respectively perform the same scrambling on propagation path estimation values output from the propagation path estimating sections 3-a and 3-b as scrambling provided in the information symbol on the transmission antennas sides, an adding section 3-c that adds scrambled propagation path estimation values, and a propagation path compensating section 7 that performs propagation path compensation of the information symbol included in the received packet using a signal output from the adding section 3-c.Type: GrantFiled: November 15, 2006Date of Patent: June 18, 2013Assignee: Sharp Kabushiki KaishaInventors: Yasuhiro Hamaguchi, Minoru Kubota, Shimpei To, Shoichi Shitara, Kimihiko Imamura
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Patent number: 8463212Abstract: A receiving apparatus includes: a signal-level detecting unit detecting a signal level of an input signal; a first signal-level converting unit including amplifiers, capturing the input signal and converting a signal level of the input signal; a switching unit switching an output of a converted level signal; a switching control unit selecting a specific amplifier and controlling the switching unit to select an output signal from the selected amplifier; a band-pass filter allowing only a predetermined frequency hand in the switched signal to pass; a second signal-level converting unit converting a signal level of an output signal from the amplifier into a predetermined signal level at which S/N of a mixer is maximized; the mixer mixing the converted signal passed through the band-pass filter, and an oscillation signal to generate an intermediate frequency signal; and a demodulating unit demodulating the intermediate frequency signal.Type: GrantFiled: February 3, 2010Date of Patent: June 11, 2013Assignee: Sony CorporationInventors: Nobuyuki Ishikawa, Yukio Yamazaki
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Patent number: 8457236Abstract: A method for signal processing in a receiver includes receiving in the receiver a Multi-User Multiple-Input Multiple-Output (MU-MIMO) signal. The MU-MIMO signal includes at least a first signal, which is precoded using a first precoding scheme and is addressed to the receiver, and a second signal, which is precoded using a second precoding scheme. An average error rate achievable in decoding the first signal in the presence of the second signal is computed. The average error rate is computed over a set of possible choices of the second precoding scheme. The first precoding scheme is selected from among a plurality of available precoding schemes so as to satisfy a criterion defined over the average error rate. The receiver sends feedback to a transmitter transmitting the first signal. The feedback depends on the selected first precoding scheme and causes the transmitter to control transmission of the first signal.Type: GrantFiled: March 14, 2010Date of Patent: June 4, 2013Assignee: Marvell World Trade Ltd.Inventors: Krishna Srikanth Gomadam, Daniel Yellin, Yu-Ngok Li
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Patent number: 8457625Abstract: A mobile communication system including base stations, wherein each base station includes: a report unit which exchanges a current target value of communication quality for a mobile station with other base stations; a comparison unit which compares a current target value of a current station with target values of the other base stations; and a management unit which changes the current target value based on the comparison result of the comparison unit.Type: GrantFiled: March 5, 2009Date of Patent: June 4, 2013Assignee: NEC CorporationInventor: Kenichi Takai
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Patent number: 8446972Abstract: A reception device which communicates with a transmission device including multiple transmission antennas, the reception device including: at least one reception antenna which receives multiple transmission signals transmitted by the transmission device from the multiple transmission antennas; a propagation channel response estimation unit which estimates propagation channel responses among the multiple transmission antennas and the reception antenna; a block division unit which divides a reception signal of at least one of the reception antennas into multiple blocks based on a multipath; and a transmission signal detection unit which detects the transmission signals transmitted by the transmission device based on the reception signal divided by the block division unit into the multiple blocks and the propagation channel responses estimated by the propagation channel response estimation unit. The transmission signal detection unit includes: an interference cancellation unit and a signal separation unit.Type: GrantFiled: April 24, 2009Date of Patent: May 21, 2013Assignee: Sharp Kabushiki KaishaInventors: Ryota Yamada, Takashi Yoshimoto, Kazuyuki Shimezawa
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Patent number: 8442469Abstract: Signal quality of a composite received signal in a radio communication network is optimized by adjusting a phase offset between received and/or transmitted signals based on signal quality parameters of the received and/or transmitted signals. The phase offset is adjusted by varying the phase offset between the received or transmitted signals such that that the composite signal is circularly, elliptically, or linearly polarized. The phase offset between the received or transmitted signals is continually adjusted based on the received signal quality parameters.Type: GrantFiled: December 15, 2009Date of Patent: May 14, 2013Assignee: AT&T Mobility II LLCInventors: John E. Lewis, Melvin D. Frerking, David G. Shively
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Patent number: 8433359Abstract: An uplink power control technique may include a simplified maximum sector throughput (SMST) and a generalized maximum sector throughput (GMST). The SMST and GMST techniques may be used to determine a maximum sector throughput and cell-edge throughput to enhance the overall efficiency of the communication system. The uplink power control technique may determine the optimal uplink power value without collecting interference over thermal noise and without computing the individual channel losses in each neighboring sector.Type: GrantFiled: December 3, 2009Date of Patent: April 30, 2013Assignee: Intel CorporationInventors: Rongzhen Yang, Wei Guan, Hujun Yin
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Patent number: 8422976Abstract: There is disclosed an antenna diversity system for relatively broadband broadcast reception in vehicles such as motor vehicles. The device can include a diversity processor having numerous components including a microprocessor for controlling a signal selection switch. In alternative embodiments the processor can be incorporated into a receiver or into a multi-antenna system. One advantage of these designs is that it is able to exist with one reception tuner and being able to select one signal from a plurality of antenna signals A1, A2, . . . AN, with great probability, whose signal components lie above the level necessary for interference-free reception, over the entire channel bandwidth B.Type: GrantFiled: July 10, 2008Date of Patent: April 16, 2013Assignee: Delphi Delco Electronics Europe GmbHInventors: Heinz Lindenmeier, Stefan Lindenmeier, Jochen Hopf, Leopold Reiter
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Patent number: 8423066Abstract: A method, wireless communication device, and computer program product are provided for scheduling wireless communication between a base station and one or more mobile wireless communication devices. Signals indicative of motion are obtained and utilized to facilitate scheduling operations. In some embodiments, signals indicative of motion are used in estimation or prediction of variable conditions of the common radio medium, and scheduling, such as opportunistic scheduling, is performed based at least in part on the estimates or predictions. Signals indicative of motion may be obtained from GPS data, accelerometer data or other data generated at a mobile wireless communication device.Type: GrantFiled: February 23, 2010Date of Patent: April 16, 2013Assignee: Research In Motion LimitedInventor: Michael Joseph DeLuca
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Patent number: 8411777Abstract: A wireless communications device having a complex vector quantization codebook for use in a downlink multi-user MIMO (multiple-input-multiple-output) mobile broadcast system with feedback enables the interference between data simultaneously sent by the base station to a plurality of mobile terminals to be reliably minimized. The codebook contains many subsets of code vectors that are substantially mutually (i.e., pairwise) orthogonal, or almost orthogonal, to each other. With use of such a codebook, a base station can transmit simultaneously to subsets of mobile terminals associated with these subsets of code vectors with minimal interference therebetween.Type: GrantFiled: June 22, 2007Date of Patent: April 2, 2013Assignee: Alcatel LucentInventor: Alexei Ashikhmin
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Patent number: 8412108Abstract: A method including: processing at a first processing frequency, such that each instance of processing is separated by a first processing time period, at least a first signal; increasing the processing frequency to a second processing frequency and switching from processing the first signal to processing a second signal; determining a parameter indicative of the quality of the second signal; and determining, within the first processing time period measured from the last instance of processing the first signal at the first frequency, which one or more signals to process at the next instance of processing by comparing respective parameters of at least the first and second signals.Type: GrantFiled: April 10, 2008Date of Patent: April 2, 2013Assignee: Nokia CorporationInventors: Kimmo Marko Tapani Alanen, Jari Tapani Syrjarinne
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Patent number: 8396502Abstract: A power controlling method and corresponding base station for controlling the transmission power of each user terminal are disclosed, in which, each user terminal is paired into virtual MIMO transmission. In the solution, first, determining the transmission power of each user terminal that makes the sum of the transmission power of each user terminal minimum under the case that the specific index for each user terminal meets a required threshold value; then, feed backing the determined transmission power of each user terminal to each user terminal. Compared with the prior art, the solution can achieve a preferable power efficiency.Type: GrantFiled: July 23, 2007Date of Patent: March 12, 2013Assignee: Alcatel LucentInventor: Keying Wu
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Patent number: 8396412Abstract: A mobile terminal is provided having a memory, a display, a wireless communication unit having a first module to receive a first broadcast signal and a second module to receive a second broadcast signal, and a controller to control the wireless communication unit, wherein when a signal strength of the first broadcast signal received by the first module is less than a first signal strength, the controller to control the second module to receive the second broadcast signal and the second broadcast signal is buffered in the memory while the display displays content corresponding to the first broadcast signal received by the first module.Type: GrantFiled: December 17, 2009Date of Patent: March 12, 2013Assignee: LG Electronics Inc.Inventors: Sang Hoon Lee, Youn Sik Kim
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Patent number: 8391927Abstract: An antenna structure includes first and second antennas. The first antenna has a first geometry corresponding to a first frequency. The second antenna has a second geometry corresponding to a second frequency. The second antenna is proximal to the first antenna and utilizes electrical-magnetic properties of the first antenna to transceive signals at the second frequency.Type: GrantFiled: June 12, 2010Date of Patent: March 5, 2013Assignee: Broadcom CorporationInventors: Jesus Alfonso Castaneda, Franco De Flaviis, Ahmadreza (Reza) Rofougaran
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Patent number: 8391902Abstract: To schedule uplink transmission time slots for a collection of mobile communication devices, a set of base station target interference patterns is associated with base stations. A time slot target interference pattern is assigned for each time slot and it repeats after several time slots. The time slot target interference pattern in a given time slot specifies the interference allowed by each time slot to a given base station by any single mobile. A priority index may be determined for each time slot for each mobile associated with the particular base station. The priority index may be based, in part, on a determined correlation between the time-slot target interference patterns and a potential interference profile of a mobile to which a time slot is to be allocated.Type: GrantFiled: March 22, 2012Date of Patent: March 5, 2013Assignee: Apple Inc.Inventors: Nimal Senarath, Kelvin Kar-Kin Au, Shalini Periyalwar
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Patent number: 8391879Abstract: Methods and apparatus well suited to decentralized traffic scheduling in wireless peer to peer network are described. An individual wireless terminal corresponding to a peer to peer connection makes a transmitter yielding or receiver yielding decision for a traffic slot. Quality of service information is disseminated as part of the scheduling control signaling. A scheduling control signal, e.g., a traffic transmission request signal or a traffic transmission request response signal, includes a pilot portion and a quality of service information portion. The pilot facilitates the recovery of the quality of service information by a plurality of different devices which may have different channel conditions with respect to the transmitter of the scheduling control signal. The different devices may benefit from utilizing the recovered quality of service information in making a yielding decision regarding traffic signaling in a traffic segment.Type: GrantFiled: November 10, 2008Date of Patent: March 5, 2013Assignee: QUALCOMM IncorporatedInventors: Junyi Li, Saurabh Tavildar, Rajiv Laroia, Gavin Horn, Ashwin Sampath, Xinzhou Wu
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Patent number: 8391807Abstract: A communication device includes memory, an input interface, a processing module, and a transmitter. The processing module receives a digital signal from the input interface, wherein the digital signal includes a desired digital signal component and an undesired digital signal component. The processing module identifies one of a plurality of codebooks based on the undesired digital signal component. The processing module then identifies a codebook entry from the one of the plurality of codebooks based on the desired digital signal component to produce a selected codebook entry. The processing module then generates a coded signal based on the selected codebook entry, wherein the coded signal includes a substantially unattenuated representation of the desired digital signal component and an attenuated representation of the undesired digital signal component. The transmitter converts the coded signal into an outbound signal in accordance with a signaling protocol and transmits it.Type: GrantFiled: August 20, 2012Date of Patent: March 5, 2013Assignee: Broadcom CorporationInventor: Nambirajan Seshadri
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Patent number: 8385965Abstract: A method for generating a filtered signal quality value used in a power control system of a wireless communication apparatus. An estimated signal quality value of a received signal is generated. A filtered signal quality value is generated based on the estimated signal quality value. The filtered signal quality value is generated in dependence of at least one of registering a difference between a first and a second reference signal quality value, and a change in transmitted power of said received signal. A power control device comprising a signal quality estimator, a BLER estimator, a regulator, and an inner loop is configured to implement the method.Type: GrantFiled: December 15, 2005Date of Patent: February 26, 2013Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Elias Jonsson, Johan Nilsson, Rama Kumar Mopidevi
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Patent number: 8374616Abstract: In a broadcast service area having regions with varying inter site distances between transmitter sites, the robustness of the transmitted signal is set to meet minimum quality of service (QoS) requirements in the region having small ISD, and additional resources are allocated to the region having large ISD to provide greater robustness. The additional resources in the large ISD area may be used for blind retransmissions of either the original data or new data.Type: GrantFiled: April 26, 2010Date of Patent: February 12, 2013Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Jörg Huschke, Ghyslain Pelletier, Mai-Anh Phan
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Patent number: 8374711Abstract: A method for selecting an audio data source for a multimedia device includes detecting an error state of audio data for generating a detection result, wherein the audio data is generated by a digital source of the multimedia device, generating an initial counting value, generating a counting result according to the detection result and the initial counting value, confining the counting result within a boundary for generating a limit result, and comparing the limit result with a threshold for generating a comparison result, for selecting the audio data source of the multimedia device.Type: GrantFiled: December 8, 2008Date of Patent: February 12, 2013Assignee: NOVATEK Microelectronics Corp.Inventor: Chih-Sheng Chou
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Patent number: 8359042Abstract: Provided is a communication system using various types of random beamforming technologies. Each of terminals that belong to a user group may generate a decoding matrix, based on interference caused by a neighboring base station of a serving base station. Each of the terminals may transmit, to the serving base station or the neighboring base station, information associated with a signal-to-interference plus noise ratio (SINR) or throughput based on the decoding matrix. The serving base station may select, from the terminals, at least one target terminal to communicate with the serving base station.Type: GrantFiled: July 27, 2009Date of Patent: January 22, 2013Assignee: Samsung Electronics Co., Ltd.Inventors: Young-Doo Kim, Chan Soo Hwang, Eung Sun Kim
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Patent number: 8345806Abstract: An apparatus and a method are provided for detecting N number of TX signals in a MIMO wireless communication system. The apparatus includes an RF processor, a channel estimator, and a signal detector. The RF processor converts signals, received through multiple antennas, into baseband signals. The channel estimator estimates channel information of the respective antennas by using the received signals. The signal detector arranges the baseband signals of the respective antennas on the basis of the channel information, calculates a threshold value of each stage, and selects symbols with a cumulative metric smaller than or equal to the threshold value as candidates at each stage, to detect a TX signal vector with N number of symbols.Type: GrantFiled: May 28, 2008Date of Patent: January 1, 2013Assignees: Samsung Electronics Co., Ltd., ICU Research and Industrial Cooperation GroupInventors: Sung-Yoon Jung, Sang-Boh Yun, Young-Hoon Kwon, Sung-Soo Hwang, Jong-Ho Lee, Hyun-Cheol Park, Hyoun-Kuk Kim, Ki-Hwan Jeon
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Patent number: 8346293Abstract: There are provided a plurality of systems of reconfigurable radio processing unit (102) whose function and performance can be modified. A control unit (104) collects quality information on the communication link in communication methods received at respective radio processing systems (102a, 102b). According to this, the control unit (104) selects an optimal communication method and transmission mode from a plurality of communication methods and transmission modes (for example, diversity transmission between a plurality of systems, diversity transmission by a single communication method, and MIMO channel multiplex transmission). By modifying configurations of the reconfigurable radio processing unit (102) according to the selected communication method and transmission mode, it is possible to communicate at a desired transmission mode. Thus, it is possible to perform an optimal transmission to the communication link according to the quality condition and other request condition.Type: GrantFiled: June 13, 2005Date of Patent: January 1, 2013Assignee: Panasonic CorporationInventors: Katsuaki Abe, Michiaki Matsuo, Noriaki Saito, Takenori Sakamoto, Akihiko Matsuoka
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Patent number: 8331297Abstract: Embodiments of the invention describe a method for antenna selection (AS) in a wireless communication network, the network comprising user equipment (UE), wherein the UE comprises a plurality of subsets of antennas including a first subset of antennas and a second subset of antennas, and wherein the UE is configured to transmit a sounding reference signal (SRS) from a subset of antennas at a time. The method transmits a first SRS from the first subset of antennas, transmits a second SRS from the second subset of antennas, receives, in response to the transmitting the first SRS and the second SRS, information identifying an optimal subset of antennas from the first subset of antennas and the second subset of antennas, and transmits user data from the optimal subset of antennas.Type: GrantFiled: June 30, 2009Date of Patent: December 11, 2012Assignee: Mitsubishi Electric Research Laboratories, Inc.Inventors: Koon Hoo Teo, Neelesh B. Mehta, Jinyun Zhang
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Patent number: 8311573Abstract: A first wireless device associated with a first profile is communicated with using a first transmitted power. A second wireless device associated with a second profile is communicated with using a second transmitted power. A third transmitted power is determined. The third transmitted power is associated with the first wireless device receiving data using a target modulation and coding scheme. A maximum transmitted power is determined to be exceeded if the third transmitted power is used to communicate with the first wireless device. The second wireless device is communicated with using a fourth transmitted power. The fourth transmitted power allows the third transmitted power to be used to communicate with the first wireless device without exceeding the maximum transmitted power.Type: GrantFiled: April 24, 2012Date of Patent: November 13, 2012Assignee: Clearwire IP Holdings LLCInventors: Esmail Hejazi Dinan, Krishna D. Sitaram, Jong-hak Jung, Swati Tiwari, Hemanth Balaji Pawar
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Patent number: 8295225Abstract: Systems and methodologies are described that provide techniques for generating and utilizing reverse link feedback for interference management in a wireless communication system. Channel quality and/or interference data can be obtained by a terminal from a serving sector and one or more neighboring sectors, from which an interference-based headroom value can be computed that contains interference caused by the terminal to an allowable range. The interference-based headroom value can then be provided with power amplifier (PA) headroom feedback to the serving sector. Based on the provided feedback from the terminal, the serving sector can assign resources for use by the terminal in communication with the serving sector. Further, the serving sector may choose to honor or disregard a received interference-based power value based on quality of service and/or other system parameters.Type: GrantFiled: August 31, 2007Date of Patent: October 23, 2012Assignee: QUALCOMM IncorporatedInventors: Tingfang Ji, Rajat Prakash, Mohammad J. Borran, Alexei Gorokhov
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Patent number: 8295389Abstract: A method for allowing a reception end to effectively detect a sequence used for a specific channel of an OFDM communication system, and apparatus for the same are provided. During the sequence transmission, a specific part of a Zadoff-Chu sequence corresponding to the frequency “0” is omitted from a transmitted signal. In addition, first 31 constituent components of the sequence are continuously mapped to frequency resource elements of “?31” to “?1”, and the last 31 constituent components of the sequence are continuously mapped to frequency resource elements of “1” to “31”.Type: GrantFiled: August 25, 2009Date of Patent: October 23, 2012Assignee: LG Electronics Inc.Inventors: Seung Hee Han, Min Seok Noh, Yeong Hyeon Kwon, Hyun Woo Lee, Dong Cheol Kim, Jin Sam Kwak
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Patent number: 8295324Abstract: Complex digital data values derived from a DSSS signal, in particular, a GNSS signal, are delivered to a general purpose microprocessor at a rate of 8 MHz and chip sums over eight consecutive data values spaced by a sampling length (TS), each beginning with one of the data values as an initial value, formed and stored. For code removal, each of a series of chip sums covering a correlation interval of 1 ms and each essentially coinciding with a chip interval of fixed chip length (TC), where a value of a basic function (bm) reflecting a PRN basic sequence of a satellite assumes a correlation value (Bm), is multiplied by the latter and the products added up over a partial correlation interval to form a partial correlation sum. The partial correlation interval is chosen in such a way that it essentially coincides with a corresponding Doppler interval having a Doppler length (TD) where a frequency function used for tentative Doppler shift compensation and represented by a step function (sine, cosine) is constant.Type: GrantFiled: January 26, 2010Date of Patent: October 23, 2012Assignee: u-blox AGInventors: Clemens Bürgi, Marcel Baracchi, Grégoire Waelchli
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Patent number: 8290528Abstract: A base station includes: means that derives a transmission power of a mobile station based on receive quality of an uplink pilot channel; means that reports the derived transmission power to the mobile station; and means that receives a control channel transmitted by the mobile station according to the reported information. Accordingly, irrespective of transmission power history over a past continuous time, the mobile station receives an instruction on the transmission power from the base station each time when transmitting a packet so as to be able to adjust the transmission power.Type: GrantFiled: June 13, 2006Date of Patent: October 16, 2012Assignee: NTT DoCoMo, Inc.Inventors: Kenichi Higuchi, Hiroyuki Atarashi, Mamoru Sawahashi
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Patent number: 8284731Abstract: To provide a communication terminal apparatus that efficiently transmits feedback on information regarding the reception quality and transmission form to a communication control apparatus.Type: GrantFiled: September 26, 2006Date of Patent: October 9, 2012Assignee: Sharp Kabushiki KaishaInventors: Shoichi Shitara, Toshizo Nogami
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Patent number: 8285235Abstract: A wireless communication apparatus includes: an antenna; a communication unit for receiving a radio signal via the antenna; a tuning unit for tuning an impedance of the antenna; an impedance controller for controlling the tuning unit to match the impedance of the antenna with an impedance of the communication unit; and a halting unit for halting controlling the impedance of the antenna in accordance with an intensity of the received radio signal.Type: GrantFiled: June 17, 2010Date of Patent: October 9, 2012Assignee: Fujitsu LimitedInventors: Hiroyuki Egawa, Masahiko Shimizu
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Patent number: 8285234Abstract: A mobile station apparatus is provided which is capable of obtaining a diversity effect and preventing an increase in noise even if an antenna phase difference containing an error is detected. The mobile station apparatus includes a closed-loop transmit diversity control section for exerting, when the quality of the component from the second antenna is lower than a predetermined quality value based on the quality measured by the common pilot channel quality measurement section, control to cause the feedback information generation section not to use the detection result at the antenna phase difference detection section, and to continue to use the immediately preceding feedback information, control to cause the antenna verification section not to operate, and control to cause the first channel inference section to operate and the second channel inference section not to operate.Type: GrantFiled: February 16, 2011Date of Patent: October 9, 2012Assignee: Hitachi Kokusai Electric IncInventor: Takahito Ishii
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Patent number: 8265684Abstract: There is provided a method for controlling a transmission power in a second communication service making secondary usage of a spectrum assigned to a first communication service, with use of any node of one or more secondary usage node that transmits a radio signal of the second communication service, comprising the steps of: acquiring an acceptable interference power allocated to the second communication service; calculating a total sum of interference power levels on the first communication service based on transmission powers respectively required for the one or more secondary usage node; and excluding any secondary usage node of the one or more secondary usage node from allocation of the transmission power when the calculated total sum of interference power levels is larger than the acceptable interference power.Type: GrantFiled: July 21, 2010Date of Patent: September 11, 2012Assignee: Sony CorporationInventor: Ryo Sawai
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Patent number: 8249044Abstract: To generate notification information for improving accuracy of channel quality information reconstructed based on a difference in notifying using the difference in channel quality information between channels.Type: GrantFiled: March 6, 2007Date of Patent: August 21, 2012Assignee: Sharp Kabushiki KaishaInventors: Takashi Onodera, Toshizo Nogami, Naoki Okamoto
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Patent number: 8249201Abstract: Certain embodiments of the present disclosure allow for detection of a transmitted preamble sequence by processing a correlation of a received signal and a preamble hypothesis in a way that exploits the good correlation properties of the known set of preamble sequences. For certain embodiments, the highest peaks of the correlation output may be compared across all preamble hypotheses to decide which preamble sequence is transmitted.Type: GrantFiled: January 31, 2009Date of Patent: August 21, 2012Inventors: Mingguang Xu, Miguel Griot, Pranav Dayal, Ayman Fawzy Naguib
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Patent number: 8249631Abstract: There is provided a method for allocating a transmission power to a second communication service making secondary usage of a spectrum assigned to a first communication service, in a node which is able to communicate with a secondary usage node, comprising the steps of: determining an interference power acceptable for two or more second communication services when the two or more second communication services are operated; distributing a transmission power depending on the interference power among the two or more second communication services according to a first rule; distributing the transmission power similarly according to a second rule; selecting one of the first rule and the second rule based on transmission powers distributed according to the first rule and transmission powers distributed according to the second rule; and allocating the transmission powers distributed according to the selected rule respectively to the two or more second communication services.Type: GrantFiled: July 21, 2010Date of Patent: August 21, 2012Assignee: Sony CorporationInventor: Ryo Sawai
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Patent number: 8233523Abstract: In one embodiment, a system includes one or more digital feedback equalizers (DFEs) that include one or more residual intersymbol interference (ISI) detectors, one or more column balancers, and one or more weight selectors. The residual ISI detectors produce a first output signal indicating whether the residual ISI of a received input signal has a positive sign or a negative sign. The column balancers select one of the first output signals to produce a second output signal. The weight selectors access one of the weight values. The weight value corresponds to the column balancer, the residual ISI detector, and the sign of the residual ISI, and has a magnitude that is dependent on the sign of the residual ISI. The weight selectors produce a third output signal based on the weight value and the sign of the residual ISI.Type: GrantFiled: June 22, 2009Date of Patent: July 31, 2012Assignee: Fujitsu LimitedInventor: Yasuo Hidaka
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Patent number: 8219058Abstract: A radio receiver adapted to alternatively receive data over a communication channel in a first mode and a second mode. The second mode facilitates reception of data at higher data rates than the first mode. The radio receiver comprises a signal-processing unit and a control unit. The signal processing unit is adapted to determine a quality condition of the communication channel. The control unit is adapted to determine, based on the quality condition, whether the communication channel facilitates operation in the second mode and assess at least one configuration condition, one of the at least one configuration condition being that the communication channel is determined to facilitate operation in the second mode. The control unit is further adapted to configure the radio receiver to operate in the second mode when all of at least one configuration condition are fulfilled or to operate in the first mode otherwise. A method for controlling the radio receiver is also disclosed.Type: GrantFiled: July 6, 2007Date of Patent: July 10, 2012Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Bengt Lindoff, Anders Wallén
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Patent number: 8219030Abstract: Systems and methodologies are described that facilitate employing distributed frequency planning and reuse factor optimization based upon forward link and/or reverse link interference management techniques. An optimal reuse factor for a base station can be determined based upon a metric that evaluates levels of service associated with neighboring base stations. Moreover, a subset of available resource sets can be selected for use by the base station; thus, a base station specific collection of resource sets can be formed through such selection. Further, mappings of each resource set to a set of physical resources can be disseminated in a network or portion thereof. According to another example, frequency hopping can be constrained to use of resources within a resource set (rather than across more than one resource set) as provided in a base station specific hopping pattern.Type: GrantFiled: June 19, 2008Date of Patent: July 10, 2012Assignee: QUALCOMM IncorporatedInventors: Alexei Gorokhov, Avneesh Agrawal, Naga Bhushan, Tingfang Ji
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Patent number: 8213494Abstract: In one embodiment, a system includes one or more digital feedback equalizers (DFEs) that include one or more residual intersymbol interference (ISI) detectors, one or more column balancers, and one or more weight selectors. The residual ISI detectors produce a first output signal indicating whether the residual ISI of a received input signal has a positive sign or a negative sign. The column balancers select one of the first output signals to produce a second output signal. The weight selectors access one of the weight values. The weight value corresponds to the column balancer that produced the second output signal and the residual ISI detector that produced the first output signal, and has a magnitude that is substantially independent of the sign of the residual ISI. The weight selectors produce a third output signal based on the weight value and the sign of the residual ISI.Type: GrantFiled: June 22, 2009Date of Patent: July 3, 2012Assignee: Fujitsu LimitedInventor: Yasuo Hidaka
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Patent number: 8204445Abstract: A receiver device comprising: a frequency hopping radio receiver for operation according to a frequency hopping radio protocol and arranged to detect the presence of interference characteristic of a predetermined other radio protocol; and a user-alerting unit responsive to the receiver; the receiver device being configurable to actuate the user-alerting unit for alerting a user in response to the detection of interference characteristic of the other radio protocol.Type: GrantFiled: January 30, 2006Date of Patent: June 19, 2012Assignee: Cambridge Silicon Radio LimitedInventor: Peter Wood
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Patent number: 8175630Abstract: A method and apparatus for controlling the transmit power of a mobile device in a mobile communication network takes the level of self-interference into account to perform inner-loop power control. For normal inner-loop power control, a signal quality estimate is compared to a signal quality target and power control commands are generated based on the comparison. When self-interference is the dominant impairment in the received signal, a “fast break” is introduced to change inner-loop power control command generation. The amount of self-interference is determined based on the delay spread of the channel.Type: GrantFiled: July 10, 2009Date of Patent: May 8, 2012Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventor: Douglas A. Cairns
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Patent number: 8170492Abstract: A received total wideband power in a wireless communications system is measured (202) a number of times during a time interval. A site communication throughput is determined (204) and processed (206) into a time averaged site communication throughput. A probability distribution for received total wideband power is estimated (210) from the measured received total wide-band power. An estimate of a noise floor measure is computed (214) based on the probability distribution for received total wideband power and a noise rise measure is calculated (218) based on the probability distribution for received total wideband power and the estimate of a noise floor measure. According to the present invention, an adjustment (208) of the noise rise measure is provided based on the averaged site communication throughput.Type: GrantFiled: April 10, 2006Date of Patent: May 1, 2012Inventors: Torbjörn Wigren, Claes Tidestav
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Patent number: 8170161Abstract: A receiver system and method are provided, wherein the system includes a plurality of antenna elements, and a receiver device configured to emit an output based upon the received signal. The receiver device communicates a control signal that corresponds to a determined signal quality of the received signal. The receiver system also includes a switch system adapted to switch among the plurality of antenna elements in a plurality of modes, wherein the switch system includes a first switch device and a second switch device. Further, the system includes a controller that receives the control signal, wherein the controller commands the switch system to operate in a first mode utilizing the first switch device when the determined signal quality is above a threshold value, and the controller commands the switch system to operate in a second mode utilizing the second switch device when the determined signal quality is below a threshold value.Type: GrantFiled: January 23, 2009Date of Patent: May 1, 2012Assignee: Delphi Technologies, Inc.Inventors: Daniel G. Morris, Nazar F. Bally, Raed S. Shatara, Steven S. Langston