Phase Shift Keying Patents (Class 375/308)
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Publication number: 20120177144Abstract: A method and an apparatus for a transmitter to transmit data in a wireless communication system are provided. This method includes: generating a first signal field including at least one symbol; generating a second signal field configured by repeating at least one symbol of the first signal field; and transmitting a frame including the first signal field, the second signal field, and a data field and a first symbol of the second signal field is modulated through binary phase shift keying (BPSK) and symbols from a second symbol of the second signal field are modulated through Q-BPSK. According to the present invention, a service filed can be extended while maintaining compatibility with a wireless communication system in the related art by transmitting a frame using symbol repetition.Type: ApplicationFiled: January 10, 2012Publication date: July 12, 2012Applicant: Electronics and Telecommunications Research InstituteInventors: Il Gu LEE, Heejung Yu, Hun Sik Kang, Sok Kyu Lee
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Patent number: 8218680Abstract: A transmitting apparatus includes a modulation signal generating section that generates a modulation signal by modulating transmission data using one of a plurality of modulation schemes. The plurality of modulation schemes include a first modulation scheme, a second modulation scheme, and a third modulation scheme, where the first modulation scheme has maximum m-ary modulation value, the second modulation scheme has a lower m-ary modulation value than the first modulation scheme, and the third modulation scheme has a lower m-ary modulation value than the second modulation scheme. The transmitting apparatus also includes a pilot signal generating section that generates a pilot signal having one of a plurality of amplitudes, the pilot signal having a lower amplitude than a maximum amplitude of the first modulation scheme.Type: GrantFiled: April 25, 2011Date of Patent: July 10, 2012Assignee: Panasonic CorporationInventors: Yutaka Murakami, Shinichiro Takabayashi, Katsuaki Abe, Masayuki Orihashi, Akihiko Matsuoka
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Publication number: 20120170683Abstract: It is disclosed a method (and related apparatus) including configuring N information channels each carrying acknowledgement information such that the N pieces of acknowledgement information are transmittable in the form of a phase shift keying symbol having an order of N2, N being an integer equal to or greater than 2; and a method (and related apparatus) including configuring N information channels each carrying acknowledgement information such that the N pieces of acknowledgement information are receivable in the form of the phase shift keying symbol having the order of N2.Type: ApplicationFiled: June 23, 2009Publication date: July 5, 2012Inventors: Frank Frederiksen, Esa Tapani Tiirola, Kari Pekka Pajukoski, Kari Juhani Hooli
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Patent number: 8213537Abstract: An exemplary apparatus includes a modulator configured to modulate a data signal onto a carrier signal to generate a modulated signal having a transmit frequency within a predefined frequency range adjacent to and within a boundary of an uplink frequency band, a filter configured to at least partially remove a carrier frequency component from the modulated signal to produce a filtered modulated signal, and an antenna configured to transmit the filtered modulated signal.Type: GrantFiled: January 23, 2009Date of Patent: July 3, 2012Assignee: Verizon Patent and Licensing Inc.Inventors: Andrew Youtz, Iftekhar Rahman, Pingping Zong
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Patent number: 8213547Abstract: A system and method to detect a signal of interest. In one embodiment, the system comprises a memory including a first parameter value, a second parameter value, a third parameter value and a program to identify active video values and null values in a first plurality of signals including the signal of interest. The system includes an interface portion adapted to receive a second plurality of signals based upon power levels of a first plurality of signals. The signal of interest is detectable based on the first, second and third parameter values.Type: GrantFiled: December 12, 2008Date of Patent: July 3, 2012Assignee: The United States of America as represented by the Secretary of the NavyInventors: Brandon M. Sisley, Brad Prichard, Douglas N. Morgan, Craig A. Rouland
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Patent number: 8213534Abstract: Disclosed herein is a transmission apparatus including a first transmission block configured to modulate a carrier-wave signal having a predetermined frequency on the basis of a first input signal, thereby outputting a first transmission signal; and a second transmission block configured to modulate a carrier-wave signal having a predetermined frequency on the basis of a second input signal, thereby outputting a second transmission signal; wherein a first input point for inputting the first transmission signal outputted from the first transmission block into a waveguide and a second input point for inputting the second transmission signal outputted from the second transmission block into the waveguide are shifted by a distance for providing a predetermined phase difference between the first transmission signal and the second transmission signal.Type: GrantFiled: March 25, 2010Date of Patent: July 3, 2012Assignee: Sony CorporationInventors: Shigenori Uchida, Norihito Mihota, Kenichi Kawasaki
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Publication number: 20120163489Abstract: A transmitter used in a communication system includes a raised cosine filter for transmit pulse shaping. A receiver in the communication system, designed to receive and demodulate transmissions from the transmitter, includes a root-raised cosine filter for receive pulse shaping. The use of a raised cosine filter in the transmitter enables reduction of peak-to-average ratio (PAR) of the output of a power amplifier used in the transmitter, enabling the power amplifier to be implemented to have relatively higher power efficiency than otherwise. In an embodiment, the transmitter and receiver employ ?/2-shift binary phase-shift keying (?/2 BPSK), and the raised cosine filter in the transmitter is implemented to have a roll-off factor of 0.5 and a total length of four symbol periods. In an embodiment, the root-raised cosine filter is implemented to have a roll-of factor of 0.2 and a length of four symbol periods.Type: ApplicationFiled: December 23, 2010Publication date: June 28, 2012Applicant: TEXAS INSTRUMENTS INCORPORATEDInventor: Sthanunathan Ramakrishnan
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Patent number: 8208499Abstract: An approach is provided for supporting frame synchronization in a digital broadcast and interactive system. A transmitter includes an encoder that outputs a Low Density Parity Check (LDPC) codeword. The transmitter also includes a framing module generates a LDPC coded frame in response to the LDPC codeword, and appends a physical layer signaling field to the LDPC codeword for specifying modulation and coding information associated with the LDPC coded frame. The physical layer signaling field is encoded with a Forward Error Correction (FEC) code and has an embedded framing structure to assist with frame synchronization. The above arrangement is particularly suited to a digital satellite broadcast system.Type: GrantFiled: April 1, 2004Date of Patent: June 26, 2012Assignee: DTVG Licensing, Inc.Inventors: Feng-Wen Sun, Lin-Nan Lee
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Patent number: 8199847Abstract: A method and apparatus for providing an asymmetrical backwards compatible communications signal that is capable of being decoded by QPSK and OQPSK receivers as well as PSK and QAM receivers is provided. The invention comprises a timing error accumulator coupled to a first bit stream. The first bit stream includes content that is common to the QPSK/OQPSK receiver and to the PSK/QAM receiver. A phase error accumulator is coupled to a second bit stream and adjusts the phase of symbols in the second bit stream. A phase and timing error compensator is coupled to the phase error accumulator and the timing error accumulator and adjusts the first and second bit streams received from the phase error accumulator and the timing error accumulator in order to reduce timing and phase errors. A higher order modulator coupled to the phase- and timing error compensator is also provided. The higher order modulator processes the first and second bit streams to provide the asymmetrical backwards compatible signal.Type: GrantFiled: July 18, 2007Date of Patent: June 12, 2012Assignee: The DIRECTV Group, Inc.Inventors: Lin-Nan Lee, Feng-Wen Sun, Mustafa Eroz, Yimin Jiang
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Publication number: 20120140854Abstract: A radio communication device which when transmitting both a first information sequence, on which ?/4-shift differential phase shift modulation is performed, as a delayed wave and a second information sequence, on which a differential phase shift modulation is performed, as an advance wave by using a PADM method, interchanges signal points respectively belonging to quadrants which are one of a first quadrant and a third quadrant, a second quadrant and a fourth quadrant, the first quadrant and the second quadrant, the first quadrant and the fourth quadrant, the second quadrant and the third quadrant, and the third quadrant and the fourth quadrant, the signal points being included in signal points mapped onto a complex plane which consists of a real number axis and an imaginary number axis, to change the arrangement of the information sequence.Type: ApplicationFiled: August 13, 2010Publication date: June 7, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yoshihiro Hamamatsu, Masaru Nobesawa, Koji Tomitsuka, Kenichiro Tanaka
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Patent number: 8189708Abstract: A method for controlling code power levels of individual codes of a composite quadrature phase shift keyed (QPSK) signal. The method may involve obtaining a sample of the composite QPSK signal; separating the individual codes from the composite QPSK signal; analyzing the individual codes against corresponding commanded code power settings for the individual codes; and determining a code power correction signal needed for each of the individual codes needed to adjust a code power for each of the individual codes to match their corresponding commanded code power settings.Type: GrantFiled: August 8, 2008Date of Patent: May 29, 2012Assignee: The Boeing CompanyInventor: Armando Benavides
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Publication number: 20120114076Abstract: A phase shifter-attenuator system having: a controller for producing a digital word representative of a predetermined phase shift and attenuation provided to an input signal; and a phase shifter-attenuation section. The phase shifter-attenuation section includes: a phase rotator for providing one of a plurality combinations of phase shifts-attenuation states to the input signal selectively in accordance with one portion of the produced digital word; and an attenuation section for distributing the plurality of combinations of phase shift-attenuation states over a selected range of attenuations, such range being selected in accordance with a second portion of the produced digital word.Type: ApplicationFiled: November 9, 2010Publication date: May 10, 2012Applicant: Raytheon CompanyInventors: Matthew A. Morton, Jonathan P. Comeau, Edward W. Thoenes
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Patent number: 8170153Abstract: Disclosed is a binary signal modulator for minimizing deterioration of receiving performance caused by phase error. The binary signal modulator receives binary signals, and converts the binary signals into complex symbols according to a predetermined mapping relation. Here, the mapping relation is generated when a plurality of mapping symbols are arranged on a plurality of trajectories so that the distance between the mapping symbols is greater than or equal to a predetermined distance and the phase between the mapping symbols is greater than or equal to a predetermined angle from among the trajectories starting from a plurality of points on the complex plane, and a distance between the trajectories is greater than or equal to the minimum distance from among the distances between the points.Type: GrantFiled: December 14, 2007Date of Patent: May 1, 2012Assignee: Electronics and Telecommunications Research InstituteInventors: Byung-Jae Kwak, Nah-Oak Song, Dong-Seung Kwon
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Patent number: 8170138Abstract: There is an apparatus and technique for generating a sequence of modulated waveforms of finite duration in which the difference in start time of each waveform is shorter than the waveform's overall duration and each waveform in the sequence has independent data modulation imparted upon it. The apparatus consists of a bank of memory cells arranged in an N×M configuration with associated control circuitry, along with an arrangement scheme for the data in the N×M memory cells such that the waveforms will be correctly reproduced when the memory cells are addressed by the control circuitry in the prescribed order.Type: GrantFiled: July 23, 2008Date of Patent: May 1, 2012Inventor: John Pinkney
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Patent number: 8170143Abstract: A method and a corresponding transmitting device to encode data with a differential space-time block code. A code matrix is calculated recursively from a momentary data matrix with a previous code matrix as a DSTBC block with symbols that are to be transmitted, the data matrix is formed from at least two data symbols that are to be transmitted, and the amplitude is modulated. Amplitude modulation data is encoded into an amplitude difference of at least two data symbols within each individual DSTBC block.Type: GrantFiled: August 21, 2006Date of Patent: May 1, 2012Assignee: Siemens AktiengesellschsftInventors: Hermann Rohling, Alexander Vanaev
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Patent number: 8164308Abstract: There is provided an apparatus for capturing cosmic background radiation and for converting cosmic background radiation into electricity. An antenna is configured so as to capture cosmic background radiation. An electrostatic electron multiplier is connected to the antenna. A high voltage power supply is connected to the electrostatic electron multiplier whereby cosmic background radiation is converted to electricity.Type: GrantFiled: June 23, 2010Date of Patent: April 24, 2012Inventor: Stefan Juchnowycz
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Publication number: 20120093262Abstract: Modulating method and apparatus in a broadcasting and communication system are provided. The modulating apparatus includes: a first quadrature phase shift keying (QPSK) modulating unit QPSK-modulating first data including in-phase (I) data and quadrature (Q) data to generate a first signal; a phase rotating unit rotating a phase of the first signal by ? to generate a phase rotated signal; a second QPSK modulating unit QPSK-modulating second data different from the first data and including I? data and Q? data to generate a second signal; and a layer modulating unit modulating the phase rotated signal and the second signal to output a final signal.Type: ApplicationFiled: October 18, 2011Publication date: April 19, 2012Applicant: Electronics and Telecommunications Research InstituteInventors: Jae Hyun SEO, Hyoungsoo LIM, Heung Mook KIM, Soo In LEE
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Patent number: 8160178Abstract: A transmitter has a transmission modulator including first and second modulators, a phase comparator and a controller. First and second non-inverted local signals supplied to the modulators are set to have a predetermined phase difference. In a calibration action for reducing carrier leakage, the phase comparator is supplied with the first or second local signals, and carrier signals leaking at an output of the transmission modulator. The controller keeps changing the ratio of DC biasing currents to paired transistors of each modulator until the predetermined phase difference is detected with the phase comparator. When the predetermined phase difference is detected, the controller stops changing the ratio of DC biasing currents. The chip footprint of a transmitter on the direct up-conversion (DUC) architecture is reduced, and carrier leakage owing to local signals supplied to the transmission modulator are decreased.Type: GrantFiled: March 3, 2009Date of Patent: April 17, 2012Assignee: Renesas Electronics CorporationInventors: Kenji Toyota, Kazuhiko Hikasa
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Patent number: 8155246Abstract: Methods, apparatus, and systems for generating bit-wise path equivalency information corresponding to 1T decision nodes in a soft output Viterbi algorithm (“SOVA”) decoder operating with an nT clock signal. An add, compare, select circuit (ACS) of the SOVA generates decision data for decision nodes 1T through nT responsive to each nT clock signal pulse. The decision data is applied to corresponding 1T through nT path equivalency detector circuits to generate 1T through nT path equivalency information for generation of soft output signals corresponding to the 1T through nT decision data.Type: GrantFiled: December 28, 2007Date of Patent: April 10, 2012Assignee: LSI CorporationInventors: Kripa Venkatachalam, Brian K. Gutcher
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Patent number: 8155232Abstract: A method from transmitting data via multiple antennas. The method contemplates modulating data to be transmitted into a plurality of modulated symbols, encoding each pair of modulated symbols from among said plurality of symbols in accordance with a transmission diversity scheme to result in a plurality of 2 by 2 matrices, with each 2 by 2 matrix corresponding to each pair of modulated symbols, orthogonally spreading the plurality of 2 by 2 matrices to generate an output matrix, and transmitting the symbols in the output matrix via a plurality of antennas by using either a space time transmission diversity scheme, a space frequency transmission diversity scheme, or a combination of a space time transmission diversity scheme and a space frequency transmission diversity scheme.Type: GrantFiled: August 29, 2007Date of Patent: April 10, 2012Assignee: Samsung Electronics Co., Ltd.Inventors: Farooq Khan, Jianzhong Zhang, Jiann-an Tsai
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Patent number: 8149975Abstract: A system for identifying at least one phase transition in a phase-shift keying signal comprising a plurality of data samples corresponding to phase values. The system comprises a memory operable to store computing device executable instructions; and a computing device. The computing device is operable to generate a first falling edge region function for each data sample; generate a first rising edge function for each data sample; generate a first level function for each data sample; and generate a second falling edge function for each data sample. The second falling edge function equals the first falling edge function if the first falling edge function is greater than the first rising edge function and the first level function, and the second falling edge function equals zero.Type: GrantFiled: September 14, 2009Date of Patent: April 3, 2012Assignee: L3 Communications Integrated Systems L.P.Inventor: Stephen Ha
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Publication number: 20120076241Abstract: A wireless transceiver includes a receiver and a transmitter, the receiver and transmitter implemented to have multiple receive and transmit channels respectively, to provide multiple-input multiple-output (MIMO) capability. In an embodiment, the transceiver is implemented to include two transmit channels and two receive channels. Some blocks/circuitry of each of the receive and transmit channels are implemented with reduced area and current consumption, with a corresponding increase in noise. In a single-input single-output (SISO) mode of operation, the receiver combines the output of both the receive channels to compensate for the increase in noise due to the implementation with smaller area and lower current consumption. Similarly, the transmitter combines the output of both the transmit channels to compensate for the increase in noise. The transceiver operates with no signal degradation in SISO mode, and with a small degradation in signal quality in the MIMO mode.Type: ApplicationFiled: September 29, 2010Publication date: March 29, 2012Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Gireesh Rajendran, Anand Kannan, Krishnaswamy Thiagarajan
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Publication number: 20120069933Abstract: The present invention discloses a method and a device for sequencing the ZC sequences of the random access channel. The method for sequencing the ZC sequences includes the following steps: Step 202, ZC sequences are divided into a plurality of groups according to the cubic metrics of the ZC sequences; Step 204, the ZC sequences are sequenced, according to the maximum cyclic shift supported by the ZC sequences under a high speed circumstance, within each group to form a plurality of sub-groups; and Step 206, the ZC sequences within each of the plurality of sub-groups are sequenced according to the cubic metrics of the ZC sequences, wherein, the adjacent sub-groups in the same group are sequenced in different orders, while the sub-groups at the boundary of the two adjacent groups are sequenced in the same order. Thereby, the sequences could be assigned according to the CMs, and the sequence fragments could be collected for use.Type: ApplicationFiled: December 27, 2007Publication date: March 22, 2012Applicant: ZTE CorporationInventors: Peng Hao, Shuqiang Xia, Gang Tian
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Patent number: 8126029Abstract: A method, a process and an audio system for embedding bit stream in a voice signal is disclosed. A voice/data interference signal is composed and supplied to the mixer of the voice signal and the data signal such that the resulting mixed signal effectively cancels the interference and allows the interference-free signal being transmitted to the audio signal receiver/decoder. The decoder may decode the data without interference errors. A method using profile shaping to mask the noise due to modulated carrier signal is also disclosed.Type: GrantFiled: June 8, 2005Date of Patent: February 28, 2012Assignee: Polycom, Inc.Inventor: Eric Elias
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Patent number: 8126082Abstract: A method and system for generating a composite binary phase shift keying (BPSK) code from at least two independent component BPSK codes that is representative of each of the component BPSK codes. According to one embodiment the method involves gain weighting each BPSK code by its respective code power ratio to form a corresponding pluarity of gain weighted codes. The gain weighted codes are then processed in accordance with an algorithm to form a composite BPSK code. The composite BPSK code has at least a fifty percent probability of matching each one of the component BPSK codes. Specific implementations for generating a composite BPSK code from either two component BPSK codes, or from three component BPSK codes, are also disclosed.Type: GrantFiled: January 11, 2008Date of Patent: February 28, 2012Assignee: The Boeing CompanyInventor: Isaac Ming-En Jeng
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Patent number: 8126075Abstract: A system and method for encoding data for transmission over a telecommunications network. The system and method involve embedding a control data block (Ik0) within a plurality of real data blocks (IN0). Preferably, real data in the real data blocks (INO) is convoluted with at least some of the control data in the control data block (Ik0) For example, each entry in each real data block (INO) may be phase convoluted with phase angle of the corresponding entry in the control block using an encoding module. Once this is done, the real data in the real data blocks and additionally the control data block in the control block is modulated with every sub carrier.Type: GrantFiled: March 16, 2004Date of Patent: February 28, 2012Assignee: University Court of Glasgow Caledonian UniversityInventor: Brian Gordon Stewart
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Publication number: 20120045021Abstract: A transmission method for multi-antenna retransmission is provided, comprising steps of: generating the bits to be transmitted by respective antennas; mapping the bits to be transmitted by the respective antennas into symbols; and multiplying by a constant the vector constituted by the mapped symbols transmitted by multiple antennas, wherein the resulting vector is orthogonal to the matrix constituted by the symbols previously transmitted by multiple antennas, and transmitting the orthogonal symbols. According to the method of the present invention, the remapped symbols transmitted by the respective antennas and the symbols previously transmitted by the respective antennas constitute a matrix that has an orthogonal property. The orthogonal property can be used to effectively detect signals. In addition, the method has a reception algorithm with low complexity and brings about significant performance gains over conventional methods.Type: ApplicationFiled: April 27, 2010Publication date: February 23, 2012Inventors: Zheng Zhao, Xufeng Zheng
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Publication number: 20120039342Abstract: A method for execution on an apparatus configured to operate in a telecommunications network comprising a processor, wherein said processor is configured to execute said method, said method comprising encoding a plurality of uplink feedback information elements for carrier aggregation, by a set of codewords where each codeword comprises a channel, wherein at least two information elements have the same channel distribution.Type: ApplicationFiled: August 2, 2011Publication date: February 16, 2012Applicant: Huawei Technologies Co., Ltd.Inventors: Fredrik Berggren, Jianghua Liu
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Patent number: 8102897Abstract: Direct sequence spread spectrum communications can use composite codes and can operate at a plurality of different chipping rates. The composite codes can be formed using a plurality of component codes, wherein the component codes can be relatively prime and at least one of the nominal lengths of the component codes can include a plurality of prime number multiplicands. The chipping rate and code length can be reduced by dividing a master rate by one or more of the prime number multiplicands. Symbol timing and time division multiple access timing can be tied to epochs of the component codes.Type: GrantFiled: January 28, 2009Date of Patent: January 24, 2012Assignee: L-3 Communications, Corp.Inventors: Vaughn L. Mower, Merle L. Keller, Kent R. Bruening
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Publication number: 20120014470Abstract: The method and system are disclosed for automatic feedback control of integrated optical quadrature modulator for generation of optical quaternary phase-shift-keyed signal in coherent optical communications. The method comprises the steps of detecting at least a part of an output optical signal from the QPSK modulator, extracting of a particular portion of the output signal in frequency domain, and processing the signal in frequency domain to optimize the transmission of an optical link. The system and method of optical communications in fiber or free space are disclosed that implement the quadrature data modulator with automatic feedback control.Type: ApplicationFiled: September 23, 2011Publication date: January 19, 2012Inventors: Pak Shing Cho, Jacob Khurgin, Isaac Shpantzer
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Patent number: 8098758Abstract: Certain aspects of a digital baseband transmitter with digital RF/IF support in GSM/GPRS/EDGE compliant devices may comprise receiving digitized data within a chip. A control signal may be generated within the chip indicating whether the received digitized data is to be processed by an IF processing interface or a digital RF processing interface. The baseband processor has the capability to work together with different kinds of RF chips on the market and since this design is implemented on a single module, most of the circuits are shared which reduces the die size significantly. This design also provides a customer more flexibility to choose among different RF vendors.Type: GrantFiled: September 3, 2004Date of Patent: January 17, 2012Assignee: Broadcom CorporationInventor: Weidong Li
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Patent number: 8098764Abstract: Millimeter wave radio with phase modulation. In preferred embodiments each of the two radios in a link uses a single aperture to transmit radiation in one of the two bands, and receive radiation in the other of the bands. The counterpart radio used to form a link preferably is almost identical, except for the interchange of the transmit and receive frequencies. Preferred embodiments utilize a modulation scheme in which the radios each receive on-off keyed data and transmit the on-off keyed data encoded in a millimeter wave carrier wave with binary phase shift keying.Type: GrantFiled: August 7, 2008Date of Patent: January 17, 2012Assignee: Trex Enterprises Corp.Inventors: Eric Korevaar, Richard Chedester, Paul Johnson
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Patent number: 8094755Abstract: A modulation system can switch between two modulation modes. In order to comply with limits on peak power in spectral bands outside the RF operating one the transmitter is required to ramp down to a condition of minimal power. To avoid fixed ramping and trailing bits, the transmitting signal is subjected to FIR filtering. The two FIR filters are primed with a sequence using a parallel input mode before serially entering the information data.Type: GrantFiled: July 4, 2005Date of Patent: January 10, 2012Assignee: Freescale Semiconductor, Inc.Inventors: Conor O'Keeffe, Robert O'Sullivan, Patrick Pratt
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Publication number: 20120002756Abstract: A plurality of training fields of a preamble of a physical layer data unit are generated, and training fields of the plurality of training fields are mapped to respective signal streams of a plurality of streams using a mapping matrix. A signal field of the preamble of the data unit is generated, and the signal field is mapped to the plurality of signal streams using a column of the mapping matrix. The plurality of signal streams are mapped to a plurality of spatial streams, and at least i) the plurality of training fields and ii) the signal field are transmitted via the plurality of spatial streams.Type: ApplicationFiled: June 30, 2011Publication date: January 5, 2012Inventors: Hongyuan Zhang, Sudhir Srinivasa
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Patent number: 8085108Abstract: A radiofrequency transmitting device delivers output signals having a chosen radiofrequency from input data split up into complementary phase data and amplitude data. This device includes a radiofrequency reference oscillator for outputting a reference signal having a fixed radiofrequency reference, and a digital phase modulator for synthesizing the chosen radiofrequency from the fixed radiofrequency reference and for phase modulating the reference signal with the phase data, in order to produce an output signal having the chosen radiofrequency.Type: GrantFiled: September 14, 2007Date of Patent: December 27, 2011Assignee: ST-Ericsson SAInventor: Pascal Philippe
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Patent number: 8064541Abstract: A communications system and method for transmitting digital information includes arranging a modulator to have an input bit stream of binary data and arranging a signal generator to generate four orthonormal hyper phase shift keying (HPSK) basis functions that are periodic functions with a duration T. A bit to symbol mapper is arranged to combine the bit stream and the HPSK basis functions to form a succession of 4-bit HPSK symbols for 16-HPSK, 5-bit HPSK symbols for 32-HPSK or 6-bit HPSK symbols for 64-HPSK, and a transmitter is arranged to transmit signals indicative of the HPSK symbols. A receiver is arranged to receive the signals from the transmitter and the HPSK symbols are demodulated with the HPSK basis functions to reproduce the bit stream of binary data.Type: GrantFiled: January 8, 2009Date of Patent: November 22, 2011Assignee: The United States of America as represented by the Secretary of the NavyInventor: James Caldwell
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Publication number: 20110274212Abstract: The present invention is directed to a transmitter and method for transmitting data in a digital communication system, the method comprising generating an original symbol by mapping the bits of the original bit sequence using a modulation constellation, generating at least one counter part symbol from the original symbol or from at least one counter part bit sequence generated from the original bit sequence where a combination of the original symbol and the at least one counter part symbol forms a quasi pilot symbol.Type: ApplicationFiled: May 9, 2011Publication date: November 10, 2011Applicant: PANASONIC CORPORATIONInventors: Alexander GOLITSCHEK EDLER VON ELBWART, Christian Wengerter, Isamu Yoshii
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Patent number: 8055212Abstract: A wireless communication transmitter is configured to determine transmitter phase shift, and correspondingly includes a derivation circuit, one or more slope polarity tracking circuits, and a phase shift computation circuit. The derivation circuit derives a reference signal from a signal input to the transmitter and a feedback signal from the transmit signal corresponding to that input signal. So derived, differences in the reference and feedback signals reveal the effect the transmitter has on the transmit signal. Accordingly, the transmitter focuses on differences in the polarities of the reference signal's slope and the feedback signal's slope to determine the effect the transmitter has on the phase of the transmit signal. That is, the slope polarity tracking circuits track the slope polarities of the reference and feedback signals, while the phase shift computation circuit computes the transmitter phase shift as a function of differences in those tracked slope polarities.Type: GrantFiled: May 26, 2009Date of Patent: November 8, 2011Assignee: ST-Erisson SAInventors: Jonas Persson, Ralf Burdenski, Ralf Dittrich
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Patent number: 8050351Abstract: The method and system are disclosed for automatic feedback control of integrated optical quadrature modulator for generation of optical quaternary phase-shift-keyed signal in coherent optical communications. The method comprises the steps of detecting at least a part of an output optical signal from the QPSK modulator, extracting of a particular portion of the output signal in frequency domain, and processing the signal in frequency domain to optimize the transmission of an optical link. The system and method of optical communications in fiber or free space are disclosed that implement the quadrature data modulator with automatic feedback control.Type: GrantFiled: February 27, 2007Date of Patent: November 1, 2011Assignee: CeLight, Inc.Inventors: Pak Shing Cho, Jacob Khurgin, Isaac Shpantzer
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Patent number: 8044742Abstract: An apparatus for phase modulation includes a delay locked loop configured to generate from a reference signal a plurality of phase shifted signals, each of the phase shifted signals being locked to the reference signal and having a different phase shift from the other phase shifted signals with respect to the reference signal, and a multiplexer configured to select one of the phase shifted signals.Type: GrantFiled: March 11, 2009Date of Patent: October 25, 2011Assignee: QUALCOMM IncorporatedInventor: Bo Sun
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Patent number: 8036319Abstract: A direct conversion receiver and a method for correcting phase imbalance including applying an input signal to an in-phase channel and a quadrature channel of the receiver. The input signal is processed by the receiver to obtain an in-phase zero intermediate frequency (IF) signal in the in-phase channel and a quadrature zero-IF signal in the quadrature channel. The in-phase zero-IF signal and the quadrature zero-IF signal are filtered to obtain a fixed band signal. A phase imbalance correction value is obtained for the fixed-band quadrature zero-IF signal as a function of the frequency of the fixed-band in-phase zero-IF signal and the fixed-band quadrature zero-IF signal. The in-phase zero-IF signal and the quadrature zero-IF signal are sampled and the phase imbalance correction value is applied using an interpolation to the sampled quadrature zero-IF signal or to the sampled in-phase zero-IF signal to correct the phase imbalance in the direct conversion receiver.Type: GrantFiled: November 1, 2007Date of Patent: October 11, 2011Assignee: Intel CorporationInventors: Bernard Arambepola, Nick Cowley
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Patent number: 8036301Abstract: A technique for controlling a transmitter apparatus is useful for reducing power consumption, and may be particularly applicable to portable apparatuses such as mobile transceivers which employ a battery power supply. According to an exemplary embodiment, the transmitter apparatus includes a power amplifier for amplifying a transmission signal. A processor controls the power amplifier based on a type of digital modulation associated with the transmission signal.Type: GrantFiled: February 9, 2005Date of Patent: October 11, 2011Assignee: Thomson LicensingInventors: Philippe Gilberton, Vincent Demoulin
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Patent number: 8036286Abstract: A phase-shift based pre-coding scheme used in a transmitting side and a receiving side that has less complexity than those of a space-time coding scheme, that can support various spatial multiplexing rates while maintaining the advantages of the phase-shift diversity scheme, that has less channel sensitivity than that of the pre-coding scheme, and that only requires a low capacity codebook is provided.Type: GrantFiled: May 29, 2007Date of Patent: October 11, 2011Assignee: LG Electronics, Inc.Inventors: Moon-Il Lee, Bin-Chul Ihm, Jin-Young Chun, Jae-Won Chang, Jin-Hyuk Jung
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Method and transmitter structure reducing ambiguity by repetition rearrangement in the symbol domain
Patent number: 8036309Abstract: A method is provided which improves reliability of channel estimation in a digital communication system by reducing the ambiguity in the recognition of received symbols evaluated for the channel estimation. A data word transmitted according to a first mapping of data word values to modulation states is re-transmitted at least once with a second, re-arranged mapping of data word values to modulation states. The second mapping and possible further mappings are generated from the first mapping in a way that the number of different results which can be obtained from combining the transmitted original data symbol and the re-transmitted counterpart data symbol(s) is lower than the number of original modulation states in the first mapping.Type: GrantFiled: July 20, 2005Date of Patent: October 11, 2011Assignee: Panasonic CorporationInventors: Alexander Golitschek Edler Von Elbwart, Christian Wengerter, Isamu Yoshii -
Patent number: 8036310Abstract: There is provided with a transmitter including: a pilot generation unit configured to generate a plurality of pilot symbols; a bit sequence generation unit configured to invert each bit in a first bit sequence to generate a second bit sequence; a transmission block generation unit configured to generate a transmission block by giving phase rotation determined according a value of each of bits in the first and second bit sequence to each of the pilot symbols corresponding to each of the bits; and a transmission unit configured to transmit the transmission block.Type: GrantFiled: August 14, 2008Date of Patent: October 11, 2011Assignee: Kabushiki Kaisha ToshibaInventor: Koichiro Ban
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Patent number: 8031028Abstract: A circuit for providing AM/PM modulation is described. The circuit provides two drive signals which are later combined in a constructive/destructive fashion. The circuit provides AM modulation with a drive signal having a consistent power level modulated to have varying pulse widths in order to provide variable power within each cycle.Type: GrantFiled: October 22, 2004Date of Patent: October 4, 2011Assignee: SiGe Semiconductor (Europe) Ltd.Inventor: Jeffrey Wojtiuk
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Publication number: 20110216852Abstract: Various embodiments are directed to systems and methods for combining a plurality of codes. The plurality of codes may be binary codes having possible logical values of ?1 and +1 and may comprise an even number of codes. An output of the combining v0,k may be given by: v0=sgn(vi), where vi is the sum of the first plurality of codes at the first time. Embodiments for allocating different power levels among various codes are presented.Type: ApplicationFiled: March 2, 2010Publication date: September 8, 2011Inventor: Rajendra Kumar
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Patent number: 8014468Abstract: The receiver portion of a UWB wireless device is altered by replacing analog-to-digital circuitry with a simple energy detection circuit. In embodiments of the invention, the coding methodology of a transmitter is altered to support the simplified receiver configuration. For example, instead of coding the data to be sent in the phase of the UWB signal, the data is encoded in a binary fashion in discrete frequency subbands of the UWB signal. Although this may reduce the usable bandwidth of the channel, it also decreases the complexity and power consumption of UWB devices. In another embodiment of the invention, a UWB device is able to select a transmission mode (BPSK or Energy Coding) based on its environment. Moreover, in a further embodiment of the invention, receiving devices may switch between coding modes based on the capabilities of a remote transmitter and/or a peer receiver.Type: GrantFiled: December 15, 2004Date of Patent: September 6, 2011Assignee: Microsoft CorporationInventors: Amer A. Hassan, Jenelle R. Coberly
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Patent number: 8014462Abstract: Methods, apparatus, and systems for alternating quadratures differential binary phase shift keying (AQDBPSK) modulation and demodulation radically increase overall energy efficiency of a communication system due to the combined effect of efficient utilization of transmitter power, high noise immunity of modulation and demodulation, fast synchronization, and simple implementation.Type: GrantFiled: March 28, 2006Date of Patent: September 6, 2011Assignee: Teledyne Licensing, LLCInventor: Yefim Samullovich Poberezhskiy
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Patent number: RE43338Abstract: An input digital signal is periodically and alternately subjected to first modulation and second modulation, being thereby converted into a pair of a baseband I signal and a baseband Q signal. The first modulation and the second modulation are different from each other. The pair of the baseband I signal and the baseband Q signal are outputted. The first modulation may be at least 8-signal-point modulation while the second modulation may be phase shift keying.Type: GrantFiled: April 21, 2010Date of Patent: May 1, 2012Assignee: Panasonic CorporationInventors: Yutaka Murakami, Masayuki Orihashi, Akihiko Matsuoka, Morikazu Sagawa