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| Number | Title | Issue Date |
| 8184731 | Feedback adjustable constellation de-mapper A system and method to adjust the symbol constellation used to de-map a signal in an optical coherent communications system. A feedback de-mapper adjustment module is configured to compare average Error Vector Magnitude and Bit Error Ratio to a pre-defined table to ... | 05/22/2012 |
| 8160170 | Signal space expansion for a 16 QAM scheme The invention relates to methods for transmitting and receiving a data bit stream in a communication system using a 16-QAM constellation. Further, an apparatus for performing the methods is provided. To provide a modulation and coding scheme using a signal space exp... | 04/17/2012 |
| 8149938 | Transmission of ACK/NACK bits and their embedding in the CQI reference signal A transmission of information within a wireless cellular network may include a first and second type of information. A subframe is produced that includes a plurality of symbols, wherein at least one symbol is designated as a data symbol and at least one symbol is de... | 04/03/2012 |
| 8102930 | Demodulation of 16-QAM, DCM data symbols using two hybrid-QPSK constellations In one embodiment, a demapper uses two hybrid-QPSK constellations to demap pairs of equalized data symbols recovered from 16-QAM, DCM OFDM symbols, wherein the equalized data symbols in a pair correspond to the same four-bit group. A first hybrid-QPSK constellation ... | 01/24/2012 |
| 8085863 | Radio receiver or transmitter and method for reducing an IQ gain imbalance A radio receiver includes an in-phase channel and a quadrature channel, the channels being provided in parallel at a respective input with quadrature modulated radio frequency signals; and an error correction loop for detecting and correcting an imbalance in gain be... | 12/27/2011 |
| 8081695 | Channel estimation using frequency smoothing A system and method are provided for supplying a frequency-smoothed communications training signal. The method generates a frequency-smoothed unbiased training signal in a quadrature modulation transmitter. The frequency-smoothed unbiased training signal includes a ... | 12/20/2011 |
| 8081696 | Method and apparatus for multi-carrier HSDPA traffic transmission channel coding Three channel coding schemes for multi-carrier HSDPA packet data transmission are disclosed. The first scheme includes: dividing data into N groups (S210); performing CRC attachment, code block segmentation, channel coding and rate matching on each group of d... | 12/20/2011 |
| 8068548 | Method, apparatus and system for transmitting information bits A method, an apparatus, and a system for transmitting information bits, where the method for transmitting information bits includes: dividing the information bits to be transmitted into at least two groups; encoding the information bits to be transmitted in each gro... | 11/29/2011 |
| 8059738 | Apparatus and method for transmitting data using a plurality of carriers A data transmitting and receiving method of transmitting supplementary data in an OFDM communication system is disclosed. The method of transmitting and receiving the OFDM signal includes: mapping an input bit stream into at least one transfer symbol; changing at le... | 11/15/2011 |
| 8050345 | QAM and GMSK systems Transmit baseband filter and modulator for filtering and modulating a first bit rate signal into a Gaussian filtered modulated signal and a second transmit filter and modulator for filtering and modulating a second bit rate signal into a Quadrature Amplitude Modulat... | 11/01/2011 |
| 8045635 | Inter-symbol interference cancellation method for orthogonal frequency division multiple access system An inter-symbol interference cancellation method for an orthogonal frequency division multiple access system is provided. The inter-symbol interference cancellation method includes transmitting, at a base station, an OFDMA symbol having a first half part and a secon... | 10/25/2011 |
| 8040967 | Noise power interpolation in a multi-carrier system A signal is received in a telecommunication network in the form of P signals received on P corresponding antennas, where P is greater than or equal to 1. The received signals correspond to a multi-carrier signal transmitted in the form of flames comprising symbols o... | 10/18/2011 |
| 8036294 | Apparatus and method for interference cancellation in a wireless communication system A symbol demapping method and apparatus for efficient interference cancellation in a wireless communication system. Decision signal points are generated which include decision signal points based on a modulation scheme and a virtual signal point added to a zero poin... | 10/11/2011 |
| 8023580 | System and method of communication using at least two modulation methods A device may be capable of communicating using at least two type types of modulation methods. The device may include a transceiver capable of acting as a master according to a master/slave relationship in which communication from a slave to a master occurs in respon... | 09/20/2011 |
| 8023578 | Two-stage low-complexity max-log bit-level LLR calculator and method A demodulator and demodulation method includes a bit/symbol hard demodulator configured to obtain hard bit or symbol information from a received signal. At least one lookup table is configured to reference coefficients for computation of log-likelihood ratios (LLRs)... | 09/20/2011 |
| 8023579 | Quadrature demodulation device, quadrature demodulation method, and quadrature demodulation program A quadrature demodulation device effectively utilizes the result of quadrature detection in order to improve demodulation efficiency. The quadrature modulation device includes a quadrature detector DT which performs quadrature detection on a reception signal obtaine... | 09/20/2011 |
| 8005158 | Overhead signaling in a wireless communication system Improved ways of communicating assignment signals using flash signaling are described, e.g., for wireless terminals with low SNR, that are more robust against large variation of channel gains due to e.g., frequency selective fading and fast fading in time. Coding an... | 08/23/2011 |
| 8000402 | System and method for accelerated performance of quadrature amplitude modulation (QAM) decoding operations in a processor A system and method for accelerated performance of quadrature amplitude modulation (QAM) is provided. The system includes multiple general purpose registers and multiple execution units configured to decode a set of QAM tones in parallel or an individual QAM tone in... | 08/16/2011 |
| 7986741 | Method and apparatus of improved circular buffer rate matching for turbo-coded MIMO-OFDM wireless systems Methods and apparatus for determining the starting points of redundancy version transmissions in a circular rate matching operation. At least one block of information bits to be transmitted are encoded to generate a plurality of coded bits, which are then segmented ... | 07/26/2011 |
| 7986740 | Wireless mobile communication system without pilot signals Method and system for allowing abandoning pilot signals use and for increasing the immunity to Doppler Effect influence in OFDMA based wireless mobile communication systems and as a result, make them more efficient. This is carried out by transmitting N orthogonal I... | 07/26/2011 |
| 7978777 | Methodology and method and apparatus for signaling with capacity optimized constellations Communication systems having transmitter, includes a coder configured to receive user bits and output encoded bits at an expanded output encoded bit rate, a mapper configured to map encoded bits to symbols in a symbol constellation, a modulator configured to generat... | 07/12/2011 |
| 7974357 | Method and device for carrying out flexible demodulation in an OFDM-CDMA system This method for carrying out the flexible demodulation of data modulated following an amplitude modulation in quadrature is used in a communications system employing a code division multiple access technique (CDMA) and an optical frequency division multiplexing (OFD... | 07/05/2011 |
| 7961805 | Method for the coding of an OFDM/OQAM signal using symbols with complex values, and corresponding signal, devices and computer programs A method and apparatus are provided for coding an OFDM/OQAM-type multi-carrier signal formed by a temporal succession of symbols comprising a set of data elements. Each of the data elements modulates a carrier frequency of the signal. Each of the data elements is fo... | 06/14/2011 |
| 7957482 | Bit-operated rearrangement diversity for AICO mapping Transmit diversity system in which constellation rearrangement is used. Both diversity signals contain the same data and both are 16-QAM, but the location of the data bits within the constellation is different. This averages the effect of the different levels of rel... | 06/07/2011 |
| 7944984 | I/Q calibration in the presence of phase offset An I/Q calibration system for a quadrature amplitude modulation (QAM) mode transceiver includes a signal generator that generates reference in-phase (I) and quadrature (Q) signals. An I/Q mismatch compensation module generates compensated I and Q signals based on th... | 05/17/2011 |
| 7933352 | Cross QAM modulation-based symbol mapping method and apparatus in a mobile communication system A method for determining a bit pattern of a symbol in a wireless communication system using a cross modulation scheme. The method includes generating symbols with the cross modulation scheme, classifying positions of coding symbols by reliabilities of at least 3 cla... | 04/26/2011 |
| 7929630 | Adaptive RFID receiver for QAM signals The present invention provides methods and apparatuses for demodulation and decoding of backscattered 16-QAM RFID tag signals, represented by their in-phase and quadrature components at the output of the demodulator in the receiver portion of a reader interrogator. ... | 04/19/2011 |
| 7920636 | Signal space expansion for a 16 QAM scheme The invention relates to methods for transmitting and receiving a data bit stream in a communication system using a 16-QAM constellation. Further, an apparatus for performing the methods is provided. To provide a modulation and coding scheme using a signal space exp... | 04/05/2011 |
| 7899128 | Multiple-output transmitter for transmitting a plurality of spatial streams A multiple output transmitter is configured for transmitting a single input data stream over two or more spatial channels using OFDM signals. The transmitter includes a commutator to select bits from the single input data stream for two or more bit streams and two o... | 03/01/2011 |
| 7899127 | Method and device for reducing the crest factor of a signal A method and a device for reducing the crest factor of a signal is operable to generate a correction signal as a combination of a plurality of partial correction signals having respectively predetermined frequencies and a signal having a reduced crest factor being i... | 03/01/2011 |
| 7894541 | Communication system At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point g... | 02/22/2011 |
| 7876846 | Method of QAM soft demapping A method of demapping in a receiver including deriving M intermediate soft bit values yj for the I and Q data of the input signal as a function of the spacing in the constellation; and limiting the range of the M values yj. A look-up table inde... | 01/25/2011 |
| 7860180 | OFDM modem for transmission of continuous complex numbers The invention enables the transmission of continuous complex numbers using a symbol based transmission scheme such as OFDM. Accordingly, complex numbers are mapped to the constellation map, enabling a fine granularity of constellation points. This scheme may be used... | 12/28/2010 |
| 7856067 | Unequal hierarchical communications modulation method Hierarchical modulation preferably uses a 16-ary quadrature amplitude modulation (QAM) modulator with a convolutional encoder that combine to effectively provide unequal protection to two different segments of streaming input data, with improved power efficiency wit... | 12/21/2010 |
| 7835457 | Demodulating a signal having multiple frequency bands A method and an arrangement for processing a received signal which comprises phase-shift modulated or amplitude-quadrature modulated part-signals which are transmitted in a plurality of different frequency bands, wherein the received signal is processed in a plurali... | 11/16/2010 |
| 7796700 | Method and system for computing log-likelihood ratios for coded quadrature amplitude modulated signals According to an embodiment of the invention, a method and system is disclosed for determining log-likelihood ratios for a coded set of individual bits (40) of a quadrature amplitude modulation (QAM) codeword. In the method at most two constant values (33,3... | 09/14/2010 |
| 7787551 | Phasor fragmentation circuitry and method for processing modulated signals having non-constant envelopes An improvement for a phasor fragmentation engine and method, whereby a phasor flipping algorithm is applied when determining fragment phasors for a non-constant envelope modulation signal (e.g. OFDM). The phasor flipping algorithm avoids sharp phase transitions for ... | 08/31/2010 |
| 7738580 | Quadrature amplitude modulation trellis coded modulation decoding apparatus and method thereof A quadrature amplitude modulation trellis coded modulation (QAM-TCM) decoding apparatus and the related method that receives and decodes a QAM signal. The QAM-TCM decoding apparatus includes an in-phase least significant bit (LSB) decoding path, which includes a in-... | 06/15/2010 |
| 7720165 | Demapper applied to quadrature amplitude modulation trellis coded modulation decoder and related method A demapper, applied to a quadrature amplitude modulation trellis coded modulation (QAM-TCM) decoder, for generating more significant bits of a QAM signal according to the QAM signal and at least a less significant bit of the QAM signal is disclosed. The demapper inc... | 05/18/2010 |
| 7706460 | QAM signal decoding A demodulator recovers a transmitted symbol represented by a received quadrature amplitude modulation (QAM) signal. Such a demodulator may include: a QAM-decoding block operable to map a received signal vector onto a constellation so as to yield a first symbol, and ... | 04/27/2010 |
