Quadrature Amplitude Modulation Patents (Class 375/298)
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Patent number: 8418018Abstract: A system and method for encoding information is disclosed. In one embodiment, information is encoded using a high protection code for the least significant bit and a low protection code for the next three most significant bits. The remaining bits are uncoded. The high protection code may be a turbo code and the low protection code may be a trellis coded modulation code. In this embodiment, the collection of bits is then mapped according to a diagonally shifted QAM constellation technique.Type: GrantFiled: September 24, 2009Date of Patent: April 9, 2013Assignee: Ikanos Communications, Inc.Inventors: Julien Pons, Patrick Duvaut, Oliver Moreno, Laurent Pierrugues
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Patent number: 8416884Abstract: The digital RF transmitter includes a decoder for receiving the in phase (I) and quadrature (Q) digital baseband signals, a phase generator for generating eight waveforms at a carrier frequency where each phase is a multiple of 45 degrees, a first set of main amplifiers of fixed output power, a second set of auxiliary amplifiers of fixed output power such that the ratio of the voltage amplitudes at the outputs of the second set of auxiliary amplifiers to the voltage amplitudes at the outputs of the first set of main amplifiers is fixed at sqrt(2)?1, and a set of multiplexers for selecting one of the eight carrier waveforms, or an off signal, to transmit to each of the first set of main amplifiers and the second set of auxiliary amplifiers based on both the in phase (I) digital baseband signal and the quadrature (Q) digital baseband signal.Type: GrantFiled: August 18, 2010Date of Patent: April 9, 2013Assignee: Panasonic CorporationInventors: Richard W. D. Booth, Gregoire Le Grand de Mercey
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Patent number: 8416871Abstract: The present invention discloses a transmission method and apparatus for a wireless communication system. The data transmission method comprises the following steps. A first data mapped in a QAM constellation pattern is transmitted in a first transmission. And a second data, which is reversion of the first data and mapped in said QAM constellation pattern, is retransmitted. In embodiment, the interleaved data is partially swapped based on a predetermined swapping pattern. In another embodiment, first interleaved data and second interleaved data are multiplexed per N bits, N is an integer larger than 1. Therefore, improvement of reliability at first transmission or retransmission in a wireless communication system can be achieved.Type: GrantFiled: March 2, 2010Date of Patent: April 9, 2013Assignee: Acer IncorporatedInventors: Yan-Xiu Zheng, Yu-Chuan Fang
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Patent number: 8406283Abstract: Provided is a modulation apparatus that quadrature modulates a periodic signal, comprising an I-side signal output section that outputs an I-component signal; a Q-side signal output section that outputs a Q-component signal; a quadrature modulator that quadrature modulates the periodic signal with the I-component signal and the Q-component signal; an I-side correcting section that corrects the I-component signal according to an error of the quadrature modulator; and a Q-side correcting section that corrects the Q-component signal according to the error of the quadrature modulator.Type: GrantFiled: July 20, 2009Date of Patent: March 26, 2013Assignee: Advantest CorporationInventor: Go Utamaru
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Digital clipping method for a transmitter of an orthogonal frequency division multiple access system
Patent number: 8406320Abstract: The present invention relates to a digital clipping method for reducing a high peak-to-average power ratio (PAPR) of a transmission signal in a transmitter of an orthogonal frequency division multiplexing access (OFDMA) system. In the method, a) the transmission signal to be digitally clipped is divided into real and imaginary parts, b) magnitudes of the real and imaginary part signals are divided into a plurality clipping levels, and c) the transmission signal is respectively clipped by comparing the real and imaginary part signals with the plurality of clipping levels while allowing phase errors. In c), a plurality of comparators is used to respectively compare the real and imaginary parts of the complex number transmission signal with the plurality of clipping levels.Type: GrantFiled: October 26, 2005Date of Patent: March 26, 2013Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute, KT Corp., SK Telecom Co., Ltd., KTFreetel Co., Ltd., Hanaro Telecom, Inc.Inventors: Hyeong-Sook Park, Youn-Ok Park -
Publication number: 20130070866Abstract: The present invention provides an optical communication method, comprising: performing modulation on the obtained bit stream data to generate modulated signals; performing differential encoding on the modulated signals to generate differentially encoded signals; converting the differentially encoded signals into electrical signals; and mapping the electrical signals onto optical carriers to generate optical signals for transmission. With the present invention, it is possible to enhance the system's capability of resisting inter-carrier interference without decreasing spectrum efficiency, hence improving the tolerance of existing optical communication systems towards laser linewidth, fast-changing PMD, optical fiber nonlinearity, inter-channel interference and other damages, greatly enhancing system performances.Type: ApplicationFiled: April 19, 2012Publication date: March 21, 2013Inventors: Jian WU, Hui Wang, Yan Ll, Xiaobin Hong, Hongxiang Guo, Yong Zuo, Kun Xu, Wei Ll, Jintong Lin
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Patent number: 8400229Abstract: An vector modulator using a time delay and a phase shifter is disclosed, the vector modulator including a time delay (110) varying a phase of an input signal by time-delaying the input signal; a first coupler (120) converting the signal outputted in changed phase through the time delay to an I channel signal and a Q channel signal each having a 90° phase difference and outputting the I/Q channel signals; a first phase shifter (130) varying the phase of the I channel signal outputted from the first coupler within a predetermined phase range and outputting the phase-variable I channel signal; a second phase shifter (140) varying the Q channel signal outputted from the first coupler within a predetermined phase range and outputting the phase-variable Q channel signal; and a second coupler (150) coupling phase-variable I/Q channel signals and outputting the coupled signals.Type: GrantFiled: March 7, 2011Date of Patent: March 19, 2013Assignee: LS Industrial Systems Co., Ltd.Inventors: Heon soo Choi, Chang su Choi, Hyung jun Jeon, Yeong chan Kim, Jae hwan Im, Jin Kuk Hong
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Patent number: 8396150Abstract: A tone selection module selects tones suitable for use in an orthogonal frequency division multiplexing (OFDM) data transmission device based on several constraints. These constraints include number of available tones, modulation type, and code rate. The OFDM device may use either wired or wireless transmission.Type: GrantFiled: December 22, 2009Date of Patent: March 12, 2013Assignee: Intel CorporationInventors: Thomas J. Kenney, Eldad Perahia, Robert J. Stacey
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Patent number: 8396433Abstract: At a transmitting side, during carrier leak adjustment, quadrature modulation means uses a carrier wave having a frequency different from that at a receiving side to quadrature-modulate an outgoing signal. Feedback means feeds a modulated wave resulting from the quadrature modulation back to the receiving side. At the receiving side, quadrature demodulation means quadrature-demodulates the fed back modulated wave. Phase locking means locks the phase of the signal resulting from the quadrature demodulation to match the phase to the phase at the transmitting side. Offset detection means time-averages the phase-locked signal to detect a direct-current offset. At the transmitting side, based on the value of the direct-current offset detected at the receiving side, offset adjustment means corrects a direct-current offset of the outgoing signal to be quadrature-modulated.Type: GrantFiled: October 28, 2008Date of Patent: March 12, 2013Assignee: NEC CorporationInventor: Masahiro Kawai
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Patent number: 8391403Abstract: 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 first plurality of bits is mapped to a modulation state according to a given Gray mapping of binary numbers to modulation states and transmitted. The plurality of bits is re-transmitted at least once, with a sub-set of bits contained in the plurality of bits inverted, and mapped to further modulation states according to the same Gray mapping. The bits to be inverted are determined in a way that the number of different vector sum results obtainable, for all combinations of bit values within the first plurality of bits, by adding vectors representing complex values of the first and further modulation states in a complex plane, is lower than the number of different modulation states within the Gray mapping.Type: GrantFiled: February 10, 2012Date of Patent: March 5, 2013Assignee: Panasonic CorporationInventors: Alexander Golitschek Edler Von Elbwart, Christian Wengerter, Isamu Yoshii
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Patent number: 8391407Abstract: The present invention discloses a data transmission device and method thereof, and a data reception device and method thereof. The data transmission method in the present invention includes the following steps: encoding information data to obtain mother codes; generating transmission data including the mother codes and repetition codes from the mother codes, wherein parts of the mother codes with low reliability are selected to be repetition codes according to the modulation type of the mother codes; modulating the transmission data; transmitting the modulated data.Type: GrantFiled: June 8, 2011Date of Patent: March 5, 2013Assignee: Fujitsu LimitedInventors: Shengbao Liang, Hua Zhou, Jie Zhang
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Patent number: 8385445Abstract: The present invention relates to a method for processing digital signals and to a transmission/reception system implementing said method; the present invention is based on the use of LDPC codes, in particular the LDPC code of the DVB-S2 standard, in combination with a QAM modulation, in particular the 1024QAM and 4096QAM modulations; in transmission, a bit permutation (Demux) is carried out prior to the QAM constellation mapping function; in reception, the bit permutation is carried out after the QAM constellation demapping function.Type: GrantFiled: June 8, 2009Date of Patent: February 26, 2013Assignee: RAI Radiotelevisione Italia S.p.A.Inventors: Giovanni Vitale, Vittoria Mignone
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Patent number: 8385461Abstract: A system and method including deriving a subcarrier frequency from a binary data stream having a clock frequency, wherein the subcarrier frequency is substantially the same as the clock frequency; gating the subcarrier frequency using the data stream to produce a modulated OOK signal; determining a OOK subcarrier center frequency based on the modulated OOK signal with the clock frequency; delaying the modulated OOK signal relative to the binary data stream by a predetermined amount to produce a delayed modulated OOK signal; conditioning the modulated OOK signal and the delayed modulated OOK signal to create a differential transition signal in an I channel and a Q channel to provide a stable amplitude signal level reference at an input to an I and Q vector modulator.Type: GrantFiled: April 20, 2010Date of Patent: February 26, 2013Assignee: Vubiq, Inc.Inventors: Michael Gregory Pettus, Larry Bruce Nadeau
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Patent number: 8386873Abstract: Disclosed are a cooperation communication method and system using feedback signals. The cooperation communication method includes transmitting a packet to a base station by a terminal, determining, by the terminal, whether decoding of the transmitted packet is successfully performed using a feedback signal from the base station, and re-transmitting the packet to the base station by the terminal according to whether decoding of a packet of an adjacent terminal within a prescribed distance from the terminal is successfully performed.Type: GrantFiled: November 28, 2008Date of Patent: February 26, 2013Assignee: Electronics and Telecommunications Research InstituteInventors: Seong Rag Kim, Jun Young Nam, Hyun Kyu Chung
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Patent number: 8374073Abstract: A modulator and a modulation method for a communication device are disclosed. The modulator is configured to multiplex control symbols and data symbols for transmission in a signal based on information of the distance between the positions of at least two control symbols in a representation of symbol positions in the signal.Type: GrantFiled: April 22, 2008Date of Patent: February 12, 2013Assignee: Nokia Siemens Networks OyInventors: Zhenhong Li, Kari Pekka Pajukoski, Esa Tapani Tiirola
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Publication number: 20130034189Abstract: Methods and apparatuses are provided for increasing the frequency resolution of a multi-channel QAM modulator and using a novel IDFT/IFFT and polyphase filter bank architecture to provide a more computationally efficient and high density multi-channel QAM modulator. The implementations of the improved multi-channel QAM modulator modulate QAM symbol streams onto respective carrier signals where the frequency of each carrier signal is an integer multiple of a fraction of the input sample rate of the respective QAM symbol stream. The modulated carriers are then combined using a novel IDFT/IFFT and polyphase filter bank architecture.Type: ApplicationFiled: August 5, 2011Publication date: February 7, 2013Inventor: Zhuan Ye
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Patent number: 8369448Abstract: A digital communication system, having a transmitter to transmit a digital signal; and a receiver to receive the digital signal; wherein the digital signal utilizes a 32APSK system with FEC coding, and the signal is bit-mapped using gray mapping, and bits of the digital signal are ordered based on the values of a log likelihood ratio from a communications channel.Type: GrantFiled: September 18, 2006Date of Patent: February 5, 2013Assignee: Availink, Inc.Inventors: Juntan Zhang, Fengwen Sun
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Patent number: 8369433Abstract: Embodiments of a digital up-converter and an N-channel modulator are provided herein. The embodiments of the digital up-converter, in combination with the N-channel modulator, are capable of efficiently filling the spectrum of one or more RF signals with one or more types of information signals. For example, the digital up-converter can fill the spectrum of one or more RF signals with both broadcast and narrowcast video and data signals. In addition, the digital up-converter is capable of flexibly mapping the information signals to one or more channels of the one or more RF signals using a novel, three-level switching architecture.Type: GrantFiled: January 7, 2011Date of Patent: February 5, 2013Assignee: Broadcom CorporationInventors: Joel I. Danzig, Richard S. Prodan, Niki Pantelias, Thomas Kolze, Victor T. Hou, Taruna Tjahjadi
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Patent number: 8369449Abstract: A method (600) of communicating a plurality of data bits over L diversity channels uses a constellation set comprising a plurality (L) of M-point quadrature amplitude modulation (QAM) constellations corresponding to the L diversity channels. The constellations do not exhibit overlapping data points, and provide full diversity. The method includes mapping (650) k*L data bits to L QAM transmission symbols in the L QAM constellation sets, and transmitting (660) the L QAM symbols where M=2k*L. Each of each of the k*L data bits is directly mapped into all of the L QAM symbols of the QAM constellation set, and for all combinations of k*L bits, changing a value of one of k*L data bits changes all of the L symbols.Type: GrantFiled: September 19, 2006Date of Patent: February 5, 2013Assignee: Koninklijke Philips Electronics N.V.Inventor: Seyed-Alireza Seyedi-Esfahani
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Publication number: 20130028269Abstract: A digital television (DTV) system uses parallel concatenated coding (PCC), together with QAM constellations for modulating OFDM carriers. A first encoder responds to bits of randomized data to generate a first component of parallel concatenated coding. A second encoder responds to delayed bits of the randomized data to generate a second component of parallel concatenated coding. A constellation mapper generates QAM symbols responsive to successive time-slices of the first component of the PCC interleaved with successive time-slices of the second component of the PCC. An OFDM modulator generates a COFDM modulating signal responsive to the QAM symbols. In a receiver for the DTV system, the second component of the PCC and delayed first component of the PCC are iteratively decoded. Corresponding soft bits from the second component and delayed first component of the PCC are combined to supply soft randomized data used in that iterative decoding.Type: ApplicationFiled: June 15, 2012Publication date: January 31, 2013Inventor: Allen LeRoy Limberg
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Patent number: 8363752Abstract: A communications transmitter configured to reduce the average-to-minimum magnitude ratio (AMR) of a communications signal includes a symbol mapper, a pulse-shaping filter, an AMR reduction circuit, and a modulator. The symbol mapper operates to generate a sequence of symbols from a binary-source data stream containing a message to be transmitted, and the pulse-shaping filter generates a baseband signal based on the sequence of symbols. The AMR reduction circuit is configured to compare magnitudes of samples of the baseband signal to a time-varying low-magnitude threshold, and modify the baseband signal to produce a modified baseband signal having a reduced AMR if a sample of the baseband signal is determined to have a magnitude less than the time-varying low-magnitude threshold. Finally, the modulator operates to modulate a carrier signal based on the modulation information contained in the modified baseband signal.Type: GrantFiled: September 1, 2009Date of Patent: January 29, 2013Assignee: Panasonic CorporationInventor: Wayne Lee
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Patent number: 8363751Abstract: A communication method includes: (a) dividing one bit data group into a plurality of bit groups, the one bit data group being taken out from a plurality of bit data groups defined by a communication protocol for transmitting predetermined information, and exerting no substantial influence on the predetermined information even when arbitrarily inverting a value of the bit; (b) determining whether or not the values of the bits constituting the bit group are all the same by each of the plurality of bit groups divided into in step (a); (c) inverting at least one of the values of the bits of the bit group determined in step (b) that the values of the bits are all the same; and (d) arranging the plurality of bit groups, each of which has at least one of the values of the bits inverted in step (c), in the plurality of bit data groups except the one bit data group at regular intervals.Type: GrantFiled: April 8, 2010Date of Patent: January 29, 2013Assignee: Seiko Epson CorporationInventor: Hideaki Yamada
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Publication number: 20130022150Abstract: A communications transmitter includes a combination modulator and a baseband processor configured to generate amplitude, angle, in-phase and quadrature signals. The combination modulator is configured to modulate in the quadrature domain or the polar domain, depending on an output power level of the transmitter and/or the type of modulation scheme being used. When configured to modulate in the quadrature domain, the baseband processor is configured to generate time-varying in-phase and quadrature modulating signals and time-invariant amplitude and angle signals for the combination modulator. When configured to modulate in the polar domain, the baseband processor is configured to generate time-varying amplitude and angle modulating signals and time-invariant in-phase and quadrature signals for the combination modulator. In another embodiment of the invention, the communications transmitter is configurable to operate in three different operational modes: linear, envelope tracking and switch modes.Type: ApplicationFiled: July 20, 2011Publication date: January 24, 2013Inventor: Earl W. McCune, JR.
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Publication number: 20130022149Abstract: A communications transmitter includes a combination modulator and a baseband processor configured to generate amplitude, angle, in-phase and quadrature signals. The combination modulator is configured to modulate in the quadrature domain or the polar domain, depending on an output power level of the transmitter and/or the type of modulation scheme being used. When configured to modulate in the quadrature domain, the baseband processor is configured to generate time-varying in-phase and quadrature modulating signals and time-invariant amplitude and angle signals for the combination modulator. When configured to modulate in the polar domain, the baseband processor is configured to generate time-varying amplitude and angle modulating signals and time-invariant in-phase and quadrature signals for the combination modulator. In another embodiment of the invention, the communications transmitter is configurable to operate in three different operational modes: linear, envelope tracking and switch modes.Type: ApplicationFiled: July 20, 2011Publication date: January 24, 2013Inventor: Earl W. McCune, JR.
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Publication number: 20130022151Abstract: A communications transmitter includes a combination modulator and a baseband processor configured to generate amplitude, angle, in-phase and quadrature signals. The combination modulator is configured to modulate in the quadrature domain or the polar domain, depending on an output power level of the transmitter and/or the type of modulation scheme being used. When configured to modulate in the quadrature domain, the baseband processor is configured to generate time-varying in-phase and quadrature modulating signals and time-invariant amplitude and angle signals for the combination modulator. When configured to modulate in the polar domain, the baseband processor is configured to generate time-varying amplitude and angle modulating signals and time-invariant in-phase and quadrature signals for the combination modulator. In another embodiment of the invention, the communications transmitter is configurable to operate in three different operational modes: linear, envelope tracking and switch modes.Type: ApplicationFiled: July 20, 2011Publication date: January 24, 2013Inventor: Earl W. McCune, JR.
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Patent number: 8358719Abstract: A method and device for the simultaneous compensation of several signal errors that occur in an IQ-modulator, using respective inverse correction signals, wherein the optimized signal magnitude of each correction signal is calculated by the determination of the effective signal error and by the subsequent iterative minimization of the effective signal error.Type: GrantFiled: May 6, 2005Date of Patent: January 22, 2013Assignee: Rohde & Schwarz GmbH & Co. KGInventor: Joachim Danz
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Patent number: 8358711Abstract: To reduce the crest factor of a total signal, the signal dynamic range is corrected in baseband upstream of the interpolation filters. To this end, provision is made for the input of a correction device to be coupled to at least two signal sources which are designed to provide digital signals on different frequency bands. The correction device is designed to determine correction factors from the digital signals applied to the input and use them to alter the respective digital signals. The output of the correction device is coupled to a first and at least one second interpolation filter. This allows reduction of the signal dynamic range in baseband, which reduces the crest factor without having to accept substantial losses in signal quality.Type: GrantFiled: November 22, 2006Date of Patent: January 22, 2013Assignee: Lantiq Deutschland GmbHInventor: Stefano Marsili
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Publication number: 20130016796Abstract: A signal modulator includes: a modulating circuit; a first signal trace block arranged to conduct a first in-phase oscillating signal to the modulating circuit, and conduct a first quadrature-phase oscillating signal to the modulating circuit; and a second signal trace block arranged to conduct a second in-phase oscillating signal to the modulating circuit, and conduct a second quadrature-phase oscillating signal to the modulating circuit, and a phase difference caused by the first signal trace block substantially equals a phase difference caused by the second signal trace block.Type: ApplicationFiled: July 14, 2011Publication date: January 17, 2013Inventors: Chih-Hao Sun, Chi-Yao Yu
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Patent number: 8355463Abstract: A radio transmission device includes a modulation unit that maps a transmission bit sequence to a symbol corresponding to any one signal point by using a constellation in which a plurality of congruent equilateral triangles having a signal point as an apex are formed in each of four quadrants of an IQ plane representing an in-phase component and a quadrature component of a signal, two arbitrary neighboring equilateral triangles share one side, and signal points closest to an original point in the four quadrants form two neighboring equilateral triangles that share one side. The radio transmission device also includes a transmission unit that transmits the symbol obtained by mapping performed by the modulation unit.Type: GrantFiled: March 10, 2011Date of Patent: January 15, 2013Assignee: Fujitsu LimitedInventor: Jianming Wu
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Patent number: 8355465Abstract: A circuit for providing AM/PM modulation is described. The circuit includes a signal generator, which provides two phase modulated (PM) signals used to form two drive signals which are later combined in a constructive/destructive fashion. The combination of the two phase modulated signals form a signal for driving a load. When the load is driven, the resulting signal is AM/PM modulated.Type: GrantFiled: November 10, 2004Date of Patent: January 15, 2013Assignee: SiGe Semiconductor (Europe) LimitedInventor: Jeffrey Wojtiuk
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Patent number: 8355715Abstract: An encoded signal is modulated to produce a first radio frequency (RF) signal that is transmitted to a client module over a first transceiver channel when a first transceiver module is in a transceive mode. A channel scan is performed when the first transceiver module is in a scan mode. The encoded signal is modulated to produce a second RF signal and that is transmitted over a second transceiver channel when a second transceiver module is in a transceive mode.Type: GrantFiled: April 21, 2006Date of Patent: January 15, 2013Assignee: ViXS Systems, Inc.Inventors: Mathew A. Rybicki, Suiwu Dong, James Ward Girardeau, Jr., Paul Morris Astrachan, Michael M. Chen
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Patent number: 8355427Abstract: A system and method that demodulates the phase characteristic of a carrier signal are described. The scrambling of the phase characteristic of each carrier signal includes associating a value with each carrier signal and computing a phase shift for each carrier signal based on the value associated with that carrier signal. The value is determined independently of any input bit value carried by that carrier signal. The phase shift computed for each carrier signal is combined with the phase characteristic of that carrier signal so as to substantially scramble the phase characteristic of the carrier signals. Bits of an input signal are modulated onto the carrier signals having the substantially scrambled phase characteristic to produce a transmission signal with a reduced PAR.Type: GrantFiled: April 4, 2012Date of Patent: January 15, 2013Assignee: TQ Delta, LLCInventor: Marcos C. Tzannes
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Publication number: 20130010897Abstract: A method and apparatus is disclosed to map a sequence of data to Quadrature Amplitude Modulation (QAM) constellation symbols. The method and apparatus encodes only a portion of the sequence of data and leaves a remaining portion of the sequence of data unencoded. The encoded portion of the sequence of data and the remaining unencoded portion of the sequence of data are then mapped into modulation symbols of the QAM constellation. The encoded portion of the sequence of data selects subsets of the QAM constellation, and the remaining unencoded portion of the sequence of data determines a specific modulation symbol within each subset of the QAM constellation.Type: ApplicationFiled: September 14, 2012Publication date: January 10, 2013Applicant: Broadcom CorporationInventors: Lin He, Thomas J. Kolze, Ba-Zhong Shen, Gottfried Ungerboeck, Bruce J. Currivan
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Publication number: 20130010883Abstract: A data re-transferring method is based on bit transformation in a communication system. The communication system adopts a high order modulation and supports a re-transferring mechanism. The method includes transforming bits of data to be retransferred in a symbol according to a selected transformation mode, mapping the transformed bits to one constellation figure, and performing Quadrature Amplitude Modulation for the mapped bits.Type: ApplicationFiled: September 15, 2012Publication date: January 10, 2013Applicant: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Tao Fan, Hao Hu
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Patent number: 8351527Abstract: A method of transmitting a control channel format indicator (CCFI), also known as PCFICH (Physical Control Format Indicator Channel), in case where the length of a coded CCFI is not an integer multiple of three, including mapping a plurality of two-bit CCFI into a codebook with each component codeword having three bits; generating a sequence of codewords selected from the codebook by repeating the selected component codeword for predetermined times; generating a codeword by concatenating the sequence of the selected component codewords with the original CCFI bits; and transmitting the codeword carrying information of CCFI. The method further includes a step of generating a permutation of each of the four codewords by assigning K repetitions of the three-bit component codeword to the number of K resource units respectively and mapping remaining K bits of each of the four codewords separately to the number of K resource units.Type: GrantFiled: December 2, 2011Date of Patent: January 8, 2013Assignee: Samsung Electronics Co., Ltd.Inventors: Jianzhong Zhang, Joonyoung Cho, Zhouyue Pi, Farooq Khan
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Patent number: 8351870Abstract: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.Type: GrantFiled: November 15, 2006Date of Patent: January 8, 2013Assignee: ParkerVision, Inc.Inventors: David F. Sorrells, Gregory S. Rawlins, Michael W. Rawlins
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Publication number: 20130003892Abstract: The present application relates to a near field communications (NFC) transmitter (10) that is configured to modulate a carrier signal with a data signal using a quadrature modulator (12). A delay is introduced into the data signal, and this delayed version of the data signal is input to the input ports of the quadrature modulator (12). The resulting I and Q signals are combined to generate an output signal that is modulated in both amplitude and phase. An NFC receiver receiving the signal transmitted by the transmitter (10) is able to recover the data signal even when the amplitude of the received signal is greatly compressed, as the phase modulation of the transmitted signal is unaffected by the compression associated with power harvesting.Type: ApplicationFiled: June 28, 2012Publication date: January 3, 2013Applicant: Cambridge Silicon Radio LimitedInventor: Anthony McFarthing
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Patent number: 8340209Abstract: The disclosure relates to a method and apparatus for providing efficient signal transmission. Conventional linear amplifiers are most efficient when operated in compressed mode. In the compressed mode, the digital power amplifier switches between the on and off modes. A digital power amplifier operates in compressed mode only if the incoming signal is an on-off constant envelop signal. In one embodiment, the disclosure provides a method and apparatus for converting a digital baseband signal to on-off constant envelop signals for processing through binary-weighted or thermometer-weighted amplifier which are operated in compressed mode.Type: GrantFiled: September 4, 2009Date of Patent: December 25, 2012Assignee: Panasonic CorporationInventors: Paul Cheng-Po Liang, Koji Takinami, Hua Wang, Toru Matsuura
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Patent number: 8325074Abstract: A continuous-time delta-sigma digital-to-analog converter (DAC) includes a first delta-sigma modulator configured to quantize a most significant bit or bits of a digital input signal and produce a first quantization error signal, and a second multi-stage delta-sigma modulator configured to quantize less significant bits of the digital input signal. A first DAC is coupled to an output of the first delta-sigma modulator, and a second DAC is coupled to an output of the second noise-shaping filter. The second DAC has a greater resolution than the first DAC. A low pass output filter is coupled to a sum of an output of the first DAC and an output of the second DAC.Type: GrantFiled: March 22, 2011Date of Patent: December 4, 2012Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.Inventor: Martin Kinyua
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Publication number: 20120300691Abstract: The present invention is related to integrated multi-datastream transmission technology, more particularly, to integrated multi-datastream modulation technology. According to one aspect of the present invention, there is provided a modulation equipment (10), including: a symbol integration means (101), configured to combine a first bit stream with a second bit stream to form a symbol to be modulated; a symbol mapping means (102), configured to map the symbol to be modulated into a QAM modulation symbol according to a set of predetermined mapping rules; wherein, in the set of predetermined mapping rules, multiple constellations corresponding to any first bit stream are located in at least two quadrants in the constellation diagram, while multiple constellations corresponding to any second bit stream are located in at least two quadrants in the constellation diagram. The integrated transmission of a first service data and a second service data (e.g.Type: ApplicationFiled: December 31, 2010Publication date: November 29, 2012Applicant: ALCATEL LUCENTInventors: Hua Chao, Ji Li, Yonggang Wang, Zhongji Hu
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Patent number: 8319569Abstract: A quadrature amplitude modulator is provided. An oscillator generates an in-phase carrier signal having a rectangular wave, a trapezoidal wave or a waveform similar to these, and a quadrature carrier signal, the phase of which is shifted by ¼ cycle relative to the in-phase carrier signal. A multi-level driver generates an in-phase modulated signal by amplitude modulating the in-phase carrier signal with an analog in-phase baseband signal having a discrete voltage level or current level in accordance with the in-phase baseband data. Likewise, the multi-level driver generates a quadrature modulated signal by amplitude modulating the quadrature carrier signal with an analog quadrature baseband signal having a discrete voltage level or current level in accordance with the quadrature baseband data The multi-level driver generates a modulated signal, the amplitude of which takes a discrete level, by combining the modulated signals together.Type: GrantFiled: October 7, 2008Date of Patent: November 27, 2012Assignee: Advantest CorporationInventor: Shoji Kojima
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Patent number: 8300724Abstract: Digital Transceiver (DTRX) usable in a radio communications systems for transmitting and receiving digital base-band signals, wherein the DTRX (300) comprises: at least one digital up-converter (DUC) (310) for transmitting digital base-band signals and at least one digital down-converter for receiving digital base-band signals. In one aspect of the teachings disclosed herein the DUC (310) comprises at least two over-sampling units (314, 315), at least one quadrature modulation unit (340), and at least one time-discrete sigma delta band-pass modulator (318). The digital down-converter comprises at least one quadrature demodulation unit (360), at least two decimator units (356,357), and at least two sub-sampling units (354, 355). The digital base-band signal comprises an in-phase component (I-signal) and a quadrature component (Q-signal).Type: GrantFiled: December 19, 2008Date of Patent: October 30, 2012Assignee: Ubidyne, Inc.Inventors: Clemens Rheinfelder, Werner Korte, Ingeborg Sigrid Ilse-Dore Korte-Gericke, legal representative
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Patent number: 8300729Abstract: Methods and apparatus for reducing high-frequency events in polar domain signals. An exemplary method includes first generating an unmodified rectangular-coordinate signal having in-phase (I) and quadrature phase (Q) components that are modulated according to a predetermined modulation scheme. Next a first sample of the unmodified rectangular-coordinate signal is modified based on how close the first sample is to the origin in the complex signal plane and how fast a signal trajectory between the first sample and a subsequent sample changes. Finally, the modified rectangular-coordinate signal is converted to a polar domain signal having amplitude and phase components. By modifying the first sample in this manner, either or both the amplitude and phase components have reduced high-frequency content compared to a polar domain signal that would be generated without the first sample having been first modified.Type: GrantFiled: March 30, 2009Date of Patent: October 30, 2012Assignee: Panasonic CorporationInventors: Hua Wang, Paul Cheng-Po Liang
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Publication number: 20120269294Abstract: Modulation code set (MCS) and LDPC (Low Density Parity Check) coding within multiple user, multiple access, and/or MIMO wireless communications. Selective operation in accordance with different operational modes is performed. Operation within a first mode may correspond to that which is in full compliance with a given protocol, standard, and/or recommended practice, while operation within a second mode may correspond to that which provides additional/augmented capability and/or functionality with respect to that protocol, standard, and/or recommended practice. Operational modes selectivity may be made between proprietary and non-proprietary modes of operation. All available modulation coding sets (MCSs) may be in employed by providing such multi-mode operation. When operating within one of the operational modes (e.g., proprietary), a signal is generated to include an integer number of data bits per orthogonal frequency division multiplexing (OFDM) symbol using any desired operation (e.g.Type: ApplicationFiled: August 30, 2011Publication date: October 25, 2012Applicant: BROADCOM CORPORATIONInventors: Jun Zheng, Vinko Erceg, Andrew J. Blanksby
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Patent number: 8295399Abstract: A digital radio communication method includes selecting a modulation scheme for a transmission data signal from among a plurality of modulation schemes. The transmission data signal is modulated according to the selected modulation scheme to generate a first symbol, the first symbol being a first quadrature baseband signal. Further, a pilot signal is modulated according to a specific modulation scheme to generate a second symbol, the second symbol being a second quadrature baseband signal.Type: GrantFiled: September 8, 2008Date of Patent: October 23, 2012Assignee: Panasonic CorporationInventors: Yutaka Murakami, Shinichiro Takabayashi, Masayuki Orihashi, Akihiko Matsuoka
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Patent number: 8295398Abstract: The present invention discloses a data re-transferring method based on bit transformation in a communication system which adopts a high order modulation and supports a re-transferring mechanism. The method includes the processes of: exchanging the location of each bit modulated to a symbol in a constellation figure used in Quadrature Amplitude Modulation (QAM) according to a selected transformation mode; mapping re-transferred data to each bit modulated to a symbol in a constellation figure of which the location has been exchanged; performing the QAM of the re-transferred data. With the method, storage amount can be decreased, balance of reliability of bits within the same data symbol after multiple re-transferring processes can be ensured, in addition, performance of the decoder and reliability of data transmission can be improved.Type: GrantFiled: March 29, 2002Date of Patent: October 23, 2012Assignee: Huawei Technologies Co., Ltd.Inventors: Tao Fan, Hao Hu
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Patent number: 8290087Abstract: Transmitter comprising a delta-sigma modulator (DSM), a sample rate converter (SRC) situated downstream of the delta-sigma modulator with respect to a direction of transmission signal flow, and a switching amplifier (SA) situated downstream of the sample rate converter (SRC) with respect to the direction of transmission signal flow. The invention as defined above allows for a decoupling of the clock frequency of the delta-sigma modulator (DSM) and the carrier frequency, for example in radio frequency (RF) signal generation applications using delta-sigma modulators. With the invention described herein it is possible to design the delta-sigma modulator independently of the carrier frequency.Type: GrantFiled: October 21, 2008Date of Patent: October 16, 2012Assignee: Ubidyne, Inc.Inventors: Johannes Schlee, Maik Riegler
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Patent number: 8290086Abstract: Techniques for producing an output signal using an outphasing transmitter are disclosed. In some examples, constant modulation (CM) signals may be produced from a digital input signal. The CM signals may be converted to an analog state and filtered. The signals may then be modulated to produce modulated signals, which may be amplified. The amplified signals may be combined to produce combined signals, which may further be combined to produce an output signal.Type: GrantFiled: December 9, 2009Date of Patent: October 16, 2012Inventors: Tamal Bose, Xuetao Chen, Jeffery H. Reed
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Patent number: 8290083Abstract: A system and method are provided for transmitting an unbiased communications training sequence. The method generates an unbiased training sequence in a quadrature modulation transmitter. The unbiased training sequence represents a uniform accumulated power evenly distributed in the complex plane. As a result, training information in the time domain is sent via an in-phase (I) modulation path having an accumulated power. Training information in the time domain is sent via a quadrature (Q) modulation path having an accumulated power equal to the I modulation path power. Also provided are system and method for calculating an unbiased channel estimate from a received unbiased training sequence.Type: GrantFiled: May 30, 2007Date of Patent: October 16, 2012Assignee: Qualcomm IncorporatedInventor: Rabih Chrabieh
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Patent number: RE43963Abstract: A constrained-envelope digital-communications transmitter circuit (22) in which a binary data source (32) provides an input signal stream (34), a phase mapper (44) maps the input signal stream (34) into a quadrature phase-point signal stream (50) having a predetermined number of symbols per unit baud interval (64) and defining a phase point (54) in a phase-point constellation (46), a pulse-spreading filter (76) filters the phase-point signal stream (50) into a filtered signal stream (74), a constrained-envelope generator (106) generates a constrained-bandwidth error signal stream (108) from the filtered signal stream (74), a delay element (138) delays the filtered signal stream (74) into a delayed signal stream (140) synchronized with the constrained-bandwidth error signal stream (108), a complex summing circuit (110) sums the delayed signal stream (140) and the constrained-bandwidth error signal stream (108) into a constrained-envelope signal stream (112), and a substantially linear amplifier (146) amplifiesType: GrantFiled: June 14, 2010Date of Patent: February 5, 2013Assignee: Intersil Americas Inc.Inventors: Ronald D. McCallister, Bruce A. Cochran, Bradley P. Badke