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| Number | Title | Issue Date |
| RE43338 | Modulation method and radio communication system 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 ot... | 05/01/2012 |
| 8170143 | Method and transmitting device for encoding data in a differential space-time block code 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 ... | 05/01/2012 |
| 8160178 | Transmitter 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 fo... | 04/17/2012 |
| 8126082 | Gain weighted code combining system and method for combining BPSK codes 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 BP... | 02/28/2012 |
| 8098764 | Millimeter wave radio with phase modulation 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 pr... | 01/17/2012 |
| 8064541 | Hyper phase shift keying modulation 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 p... | 11/22/2011 |
| 8036310 | Transmitter and receiver 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 ... | 10/11/2011 |
| 8036309 | Method and transmitter structure reducing ambiguity by repetition rearrangement in the symbol domain 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 dat... | 10/11/2011 |
| 8014468 | Energy detection receiver for UWB 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 configura... | 09/06/2011 |
| 7965793 | Method for reducing ambiguity levels of transmitted symbols 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 a... | 06/21/2011 |
| 7933359 | Polar transmitter for increasing modulation rate using multi-phase generator Provided is a polar transmitter which increases a modulation rate using a multi-phase generator and includes: a data processor which processes and separates incoming data to an amplitude component and a phase component; a multi-phase generator which generates a plur... | 04/26/2011 |
| 7929640 | High speed differential encoder and interleaver A plurality of differential encoders encodes a plurality of parallel data bit streams. XOR gates interleave the outputs of the differential encoders forming a single high speed differentially encoded bit stream with a data rate that is the sum of the data rate of th... | 04/19/2011 |
| 7885354 | System and method for enhancing near vertical incidence skywave (“NVIS”) communication using space-time coding A system and method are described in which space-time coding techniques are used to transmit and receive multiple data streams within a near vertical incidence skywave (“NVIS”) communication system. Within the NVIS communication system, multiple independent data... | 02/08/2011 |
| 7876855 | Phase modulation power spreading used to reduce RF or microwave transmitter output power spur levels A two stage mixer is configured to reduce the power levels of out of band spurious output signals or spurs, such as the leakage from the second stage mixer by way of phase modulation power spreading. The local oscillator signal applied to first mixer stage is phase ... | 01/25/2011 |
| 7860188 | Digital modulator for a GSM/GPRS/EDGE wireless polar RF transmitter A digital modulator in a radio transmitter includes circuitry for switching between Gaussian Minimum Shift Keying (GMSK) and Phase-Shift Keying (PSK) while maintaining spectral mask requirements. The digital modulator of the present invention includes both GMSK and ... | 12/28/2010 |
| 7830983 | Method to minimize degradation in a D-MPSK hierarchical modulation system The present invention provides a method to minimize degradation in a D-MPSK hierarchical modulation system by adding additional data throughput (i.e., secondary information) as an offset to the primary signal transmitted by a SDARS terrestrial repeater. The present ... | 11/09/2010 |
| 7822149 | Method to enable single frequency network optimization Additional data may be added to the current SDARS satellite signals as a phase and/or amplitude offset from the legacy quadrature phase shift keying (QPSK) modulated data and transmitted by the SDAR terrestrial repeaters. However, in the case where a legacy receiver... | 10/26/2010 |
| 7778356 | Modulator and method for producing a modulated signal A modulator including a direct modulation synthesizer circuit, a reference frequency oscillator for providing an input reference signal to the direct modulation synthesizer circuit for locking a carrier frequency to a stable frequency and a pre-emphasis unit for dat... | 08/17/2010 |
| 7751497 | Method to minimize compatibility error in hierarchical modulation using variable phase The present invention provides a method, receiver and transmitter for use in a SDAR system. The method involves generating a first modulated signal based on first input data. Additional modulation is superimposed on the first modulated signal based on additional inp... | 07/06/2010 |
| 7702034 | Parallel processing for programmable wideband digital modulation A circuit 30 for upsampling and upconverting a high rate signal that is divided into M in-phase (I) symbols and M quadrature (Q) symbols. A Nyquist filter 32 upsamples by a factor of k each of the 2M symbols in parallel during one system clock period (... | 04/20/2010 |
| 7693235 | Reduced complexity coding system using iterative decoding A concatenated coding scheme, using an outer coder, interleaver, and the inner coder inherent in an FQPSK signal to form a coded FQPSK signal. The inner coder is modified to enable interative decoding of the outer code. ... | 04/06/2010 |
| 7680213 | Generating higher order modulation using QPSK modulations A method and system generates a higher order modulation, in which a complex sequence of binary digits corresponding to symbols of a higher order modulation is received. The symbols correspond to constellation points of the higher order modulation. First mapping mean... | 03/16/2010 |
| 7656966 | Method to increase performance of secondary data in a heirarchial modulation scheme This invention provides a receiver for use in a SDAR system which includes a receiving unit having satellite signal detection means for detecting a first transmit signal transmitted from a first communication satellite and a second transmit signal transmitted from a... | 02/02/2010 |
| 7630456 | Method and/or apparatus to efficiently transmit broadband service content using low density parity code based coded modulation An apparatus comprising a first circuit and a second circuit. The first circuit may be configured to generate an MPEG packet data stream. The second circuit may be configured to (i) scramble the data stream to generate a scrambled data stream, (ii) encode the scramb... | 12/08/2009 |
| 7627058 | Alternating quadratures differential binary phase shift keying modulation and demodulation method A method of performing alternating quadratures differential binary phase shift keying modulation involves limiting phase changes between adjacent in time modulator output symbols to ±90 °, and transmitting modulator input data by 0° and 180° phase differences be... | 12/01/2009 |
| 7596187 | Digital modulation circuit and method as well as digital demodulation circuit and method A mixer circuit accumulates I signal (digital signal of first channel) having its band limited by low-pass filter and first carrier signal to perform two-phase shift keying modulation thereon. An adder adds fundamental-wave component of bit clock signal BCK into Q s... | 09/29/2009 |
| 7555061 | Optical communication device An optical sender is disclosed that operates in a Differential Quadrature Phase Shift Keying modulation scheme for high speed optical transmission and is capable of performing logical calculations at a low speed. The optical sender transmits a Differential Quadratur... | 06/30/2009 |
| 7545884 | Digital baseband modulation apparatus and demodulation apparatus A digital baseband modulation apparatus includes: a spread modulation part for complex spreading an I component signal and a Q component signal of a send signal so as to output an output signal; and an amplitude conversion part for decreasing the amplitude component... | 06/09/2009 |
| 7539271 | System and method for multi-band ultra-wide band signal generators The present invention provides systems and methods relating to ultra-wide band communications. A method is provided for transmitting information using ultra-wide band transmission. The method includes allocating, for signal transmission, each of a plurality of frequ... | 05/26/2009 |
| 7515652 | Digital modulator for a GSM/GPRS/EDGE wireless polar RF transmitter A digital modulator in a radio transmitter includes circuitry for switching between Gaussian Minimum Shift Keying (GMSK) and Phase-Shift Keying (PSK) while maintaining spectral mask requirements. The digital modulator of the present invention includes both GMSK and ... | 04/07/2009 |
| 7515651 | Parallel processing for programmable wideband digital modulation A circuit 30 for upsampling and upconverting a high rate signal that is divided into M in phase (I) symbols and M quadrature (Q) symbols. A Nyquist filter 32 upsamples by a factor of k each of the 2M symbols in parallel during one system clock period (... | 04/07/2009 |
| 7496153 | Modulating signals for coherent and differentially coherent receivers A system incorporates time-hopped and transmitted-reference transceivers in the same wireless network. A transmitter modulates a sequence of bits in a wireless communications network by generating a reference waveform and a data waveform of a waveform pair for each ... | 02/24/2009 |
| 7469022 | Methods and apparatus for symmetrical phase-shift keying Methods and apparatuses employing symmetrical phase-shift keying (SPSK) for data modulation and demodulation. Each symbol in a transmission signal carries n-bit information and is transmitted with one of 2n+1 directions. Half directions among the 2n+... | 12/23/2008 |
| 7443921 | Mobile body communication apparatus When communications of the same data are performed using a multi-carrier modulation method between a plurality of base stations and a mobile station at the same time and with the same frequency, a standing wave interference is generated to lower the carrier electric... | 10/28/2008 |
| 7439813 | Method and system for generating carrier frequencies for UWB application Apparatus and method for generating first, second and third carrier frequencies of 3432 MHz, 3960 MHz and 4488 MHz respectively, for use in a wireless transmission system deploy only first and second PLLs which are configured to generate 6336 MHz and 2640 MHz signal... | 10/21/2008 |
| 7436902 | Multi-dimensional space Gray code maps for multi-dimensional phase modulation as applied to LDPC (Low Density Parity Check) coded modulation Multi-dimensional space Gray code maps for multi-dimensional phase modulation as applied to LDPC (Low Density Parity Check) coded modulation. A novel approach is provided within LDPC coded modulation communication systems that employ multi-dimensional phase modulati... | 10/14/2008 |
| 7433418 | Method and apparatus for efficient storage of training sequences for peak to average power constrained modulation formats Some embodiments store a training sequence in a communications system. The stored training sequence exhibits certain desirable characteristics when used by a peak to average power constrained modulation format. In one embodiment, a set of original ordered sequences ... | 10/07/2008 |
| 7430252 | Apparatus and method for WGIO phase modulation An apparatus and method for WGIO phase modulation are described. In one embodiment, the method includes the receipt of a high-speed data stream, encoded according to an 8b/10b code. Once received, a symbol rate of the data stream is reduced by a predet... | 09/30/2008 |
| 7428273 | Method and apparatus for efficient preamble detection in digital data receivers Traditional techniques for data reception in burst-mode receivers are of significant complexity. To aid detection, most burst-mode systems transmit a preamble, or predetermined data pattern, at the start of each new block of data. Using current methods, the detectio... | 09/23/2008 |
| 7428426 | Method and apparatus for controlling transmit power in a wireless communications device Systems and techniques for wireless communications are disclosed. The systems and techniques include the generation of a signal, the setting of an average transmit power of the signal transmission as a function of a first threshold relating to out-of-band emissions,... | 09/23/2008 |
