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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...
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7623000 |
Hybrid linear and polar modulation apparatus
The invention is directed at a hybrid modulation apparatus which combines a polar modulation circuit and a linear modulation circuit. The hybrid apparatus allows a communications device to function...
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7606321 |
System and method for simplifying analog processing in a transmitter incorporating a randomization circuit
The system and method enable simpler analog processing in a transmitter by reducing the number of bits in a digital signal through delta sigma modulation. Selection of current sources in a digital...
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7599446 |
Modulation and demodulation based on hierarchical modulation
A modulation device comprises a modulation unit ( 2 ) that modulates data in a hierarchical manner using multiple types of modulation techniques, and a transmission unit ( 3 ) that transmits the...
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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...
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7595702 |
Modulation apparatus capable of correcting non-linearity of voltage controlled oscillator
A modulation apparatus 24 comprises a monitoring section 207 operable to monitor information about a control voltage applied to a VCO 201 as control voltage information, during any period,...
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7586293 |
Digital modulation circuit
Provided is a digital modulation circuit constructed with only a digital circuit. The digital modulation circuit includes: a clock generator which generates a reference clock pulse having a...
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7583894 |
Interferometric operation of electroabsorption modulators
Methods and apparatus are described for modulating an optical signal using electroabsorption in conjunction with an optical interferometer. Phase-shift keying modulation can be achieved with lower...
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7570702 |
Signal generation apparatus, systems, and methods
An apparatus and a system, as well as a method and an article, may include shifting a digital baseband signal upward along a frequency spectrum by an amount greater than its bandwidth to provide an...
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7564923 |
Frequency offset and method of offsetting
A transmitter digital signal processor (DSP) circuit has a transmit frequency represented by n-bit data output from a look up table (LUT). The n-bit data is outputted to an n-bit accumulator...
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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...
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7551904 |
Apparatus and method for high efficiency power amplification for a mobile communication system
An method and apparatus for power amplification in a mobile communication system, wherein a signal converter for receives signals from a baseband-side, modulates the received signals into...
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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;...
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7543213 |
Turbo decoder and dynamic decoding method used for same
To provide a turbo decoding method capable of significantly improving efficiency of a determination as to whether or not to end decoding. If the decoding by a turbo decoder is started, a soft...
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7542511 |
Wireless RF link for uncompressed transmission of HDTV signals
Systems and methods for wireless transmission of uncompressed HDTV signals are disclosed. In one embodiment, a method for transmitting an uncompressed HDTV signal over a wireless RF link, comprises...
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7541864 |
Power amplifier and pulse-width modulated amplifier
The invention relates to a power amplifier having a phase amplification path with a phase amplification stage within said phase amplification path. Here the phase amplification stage receives a...
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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...
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7539266 |
Phase shift keying wireless communication apparatus and method
A network device comprises a PSK modulator that PSK modulates a header portion of a data packet at a first effective throughput and that PSK modulates outbound data at a second effective throughput...
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7535983 |
Method for identifying the beginning of a UWB pulse sequence
A method for transmitting data in the form of pulse sequences, including a signal synchronization step carried out by a receiver of dataframes DF, in the course of which at least one time window...
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7535973 |
Correction method and correction loop for a complex digital signal
A method and apparatus for correcting the delay between the phase and the envelope of a digital signal are described. In particular, the application of this correction in digital broadcasting...
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7535965 |
Systems and methods for wireless transmission of uncompressed HDTV signals
Systems and methods for wireless transmission of uncompressed HDTV signals are disclosed. In one embodiment, a method for communicating an uncompressed HDTV signal over a wireless RF link includes...
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7535310 |
Distortion compensation circuit
A distortion compensating circuit is provided in which, in the polar modulation system, while suppressing increase of compensation data and increase of the circuit scale, a modulated signal can be...
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7532680 |
Multi-mode radio frequency transmitter
A method is disclosed to operate a multi-mode multi-timeslot RF transmitter, as is an RF transmitter that includes a control unit that operates in accordance with the method. The method includes,...
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7522658 |
Design method and implementation of optimal linear IIR equalizers for RF transceivers
A digital filter with equalizers and a corresponding method for optimizing a linear equalizer of an RF transceiver determining filter characteristics of the specified analog filter, determining...
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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....
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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...
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7512188 |
Phase shift keying signaling for integrated circuits
The present invention relates to a system for communicating between two integrated circuits (ICs) or within an IC. The ICs are either on the same circuit boards or on different circuit boards with...
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7508860 |
Pulse signal generator for ultra-wideband radio transception and radio transceiver having the same
Provided are a pulse signal generator for UWB radio transception and a radio transceiver having the same. The pulse signal generator includes: an envelope generator generating a plurality of...
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7502423 |
Digital modulator and digital modulation method
Each of a first oversampling filter and a second oversampling filter oversamples to an n×m times as high frequency as a symbol rate. The first and second oversampling filters then output output...
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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...
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7489660 |
Circuit for preventing signal quality degradation in CDMA system and method thereof
A system for preventing signal quality degradation in a CDMA system includes a phase locking unit for controlling a phase of an oscillating frequency signal by controlling a voltage control...
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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...
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7463869 |
Low noise high isolation transmit buffer gain control mechanism
A novel apparatus for a low noise, high isolation, all digital transmit buffer gain control mechanism. The gain control scheme is presented in the context of an all digital direct digital-to-RF...
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7463651 |
Method and system for exploiting spare link bandwidth in a multilane communication channel
Aspects of the invention may include a method for encoding data in a multilane communication channel. The method may include generating from existing control characters in a character set, an...
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7460832 |
Methods and apparatuses for minimizing co-channel interference
Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises scrambling a first frame using a...
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7450660 |
Apparatus and method for digital modulation
A first interpolation section 14 and a second interpolation section 24 perform sampling on input data Id 4 and Qd 4 having a sampling frequency fover so that resulting data will have a...
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7449960 |
Frequency modulation linearization system for a Fractional-N offset PLL
A linearization system is provided for a Fractional-N Offset Phase Locked Loop (FN-OPLL) in a frequency or phase modulation system. In general, the linearization system processes a modulation...
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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...
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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...
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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...
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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...
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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 8 b /10 b code. Once...
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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...
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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...
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7426246 |
Dual layer signal processing in a layered modulation digital signal system
Systems and methods for receiving layered modulation for digital signals are presented. An exemplary apparatus comprises a tuner for receiving a layered signal and producing a layered in-phase...
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7424065 |
Apparatus and method for ultra narrow band wireless communications
A wireless digital transmitting and receiving method and apparatus combining abrupt phase change modulation with an ultra narrow band filter to remove the sidebands, resulting in a single frequency...
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7412209 |
Shifted channel characteristics for mitigating co-channel interference
Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises shifting a characteristic of the...
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7412006 |
Method and apparatus for RF carrier feedthrough suppression
A method includes performing a search method to determine a pair of receiver path correction signals, performing the search method to determine a pair of transmitter path correction signals, and...
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7409013 |
Super-orthogonal space-time trellis codes, and applications thereof
A super set of orthogonal space-time block codes is combined with set partitioning to form super-orthogonal space-time trellis codes having full diversity, enhanced coding gains, and improved...
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7409012 |
Modulator and signaling method
Phase shift key modulators ( 100, 500, 1000, 1400, 1700 ) are provided in which a multiphase signal source ( 108, 1402, 1406 - 1412,1702 ) is used to generate a plurality of phases of a carrier...
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