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7623570 |
Multi sub-carrier communication system and method providing improved frequency equalization performance
There is provided a multi sub-carrier communication system for providing improved performance of a frequency equalizer and a method thereof. The multi sub-carrier communication system includes a...
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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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7612627 |
Integrated binary phase shift keying with silicon MEMS resonators
A modulator includes a micro-electromechanical resonator device configured to receive an input signal and generate two output signals in response thereto, wherein the two signals having a...
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7605724 |
Method and apparatus for a transmission signal up-converting filter
A digital up-sampling converter (DUSC) employs a signal input provided by a digital signal process (DSP) at a first rate feeding a Square Root Raised Cosine (SRRC) filter which provides for table...
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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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7583702 |
Method of transmitting paging indicator and notification indicator and corresponding modulation and demodulation devices
The present invention discloses a method of transmitting a first signal and a second signal in a wideband code-division multiple access network, wherein a probability of the appearance of signal...
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7579921 |
On-off keying-7-phase shift keying modulation system and method for fiber communication
A modulation system includes a modulator configured to employ a modulation mechanism on data. The mechanism includes a signal constellation configured to map sub-carriers which include a signal to...
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7570705 |
GMSK modulation using a dual-port memory
A GMSK modulator includes a dual-port memory, an address generator and a signal provider, where the dual-port memory respectively outputs in-phase and quadrature phase waveform data to first and...
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7555051 |
Method and device for estimating IQ imbalance
A quadrature transmitter and receiver have configurable I and Q channel paths that facilitate the application of selected test signals to determine gain and phase imbalances introduced by the...
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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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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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7518460 |
Amplitude modulation apparatus, amplitude limiting method, and computer-readable program
The present invention relates to an amplitude modulation apparatus, an amplitude limiting method, and a transmission apparatus for performing amplitude limitation on an orthogonally modulated...
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7518459 |
Harmonic-rejection modulation device
A harmonic-rejection modulation device is provided, which includes a phase splitter, a low pass filter, and a modulator. Based on a square wave, the phase splitter generates a plurality of...
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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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7515073 |
Digital sample rate conversion
Embodiments of an apparatus for sample rate conversion are described. Various embodiments include an interpolator configured to interpolate a digital input data stream by using values of an...
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7512387 |
Method and control system for controlling the output power of an RF amplifier system
A system for controlling a power supplied to a load from a radio frequency amplifier system includes a radio frequency signal generator adapted for generating a radio frequency signal, an amplifier...
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7505531 |
Signal communications system and method for noisy links
A system and method for communicating signals over a noisy channel is provided wherein an input signal may be sampled and modulated to make the signal more noise insensitive. In accordance with one...
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7492832 |
Method and apparatus for digital vector QAM modulator
Direct digital QAM modulation at an RF frequency is obtained from digitally synthesized RF signals which are generated for use as the two vectors. The two vectors are individually controlled in...
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7463108 |
Active 90-degree phase shifter with LC-type emitter degeneration and quadrature modulator IC using the same
An active 90-degree phase shifter with LC-type emitter (source) degeneration is provided, which is practiced in an integrated circuit. The phase shifter comprises a first differential amplifier,...
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7460612 |
Method and apparatus for a fully digital quadrature modulator
A novel apparatus and method for a fully digital quadrature architecture for a complex modulator. The complex modulator can substitute for existing prior art analog quadrature modulator structures...
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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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7423987 |
Feeder link configurations to support layered modulation for digital signals
Systems and methods are disclosed for feeder link configurations to layered modulation. One feeder link system employs feeder link spot beam to antennas in distinct coverage areas to enable...
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7417514 |
Method for modulating phase or frequency in a communication system using clock division
A direct division modulator is provided. The direct division modulator includes a symbol mapper converting the input data from a binary bitstream to a desired frequency deviation, such as where the...
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7412008 |
Programmable phase mapping and phase rotation modulator and method
A modulator ( 10 ) and method provides a programmable phase rotation for supporting different modulation formats and different phase rotations. The modulator ( 10 ) includes a programmable symbol...
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7379509 |
Digital intermediate frequency QAM modulator using parallel processing
The digital Intermediate Frequency (IF) modulator applies to various modulation types and offers a simple and low cost method to implement a high-speed digital IF modulator using field programmable...
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7358828 |
Orthogonal modulation device, method, program, recording medium, and modulation device
It is possible to calibrate an I(Q) signal without interrupting the modulation operation of an orthogonal modulation device. The orthogonal modulation device includes: an adder for outputting a...
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7346123 |
Quadrature modulator
A quadrature modulator includes a local oscillator oscillating at an oscillation frequency equal to 4/(2N+1) times a carrier frequency where N is a natural number, a frequency conversion block for...
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7340011 |
Method of frequency multiplication in a radiocommunications apparatus
Radiofrequency apparatus and method including at least one transmitter and/or receiver of a useful signal S 0 , at least one device adapted to the application of a coefficient N to the useful...
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7327202 |
Optimization for an IQ modulator
An IQ modulator's performance is optimized through determination of suitable control parameters by the application of known DC biases as the I and Q inputs. Also known are the relative amplitude...
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RE39983 |
Carrier injecting waveform-based modulation scheme for reducing satellite transponder power requirements and earth terminal antenna size
A QPSK modulation scheme uses a data spreading mechanism to rob a relatively limited portion of available transmitter power, and inject into the QPSK waveform a prescribed amount of carrier signal...
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7308049 |
Method and apparatus for noncoherent signal processing in pilotless wireless systems
Methods, apparatus and systems for implementing an algorithm for N-symbol noncoherent processing of M-ary DPSK signals in a pilotless, wireless system is provided. The algorithm is carried out with...
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7286613 |
Process and device for modulating a carrier with amplitude and phase error compensation
The invention relates to processes and devices which make it possible to directly modulate an RF carrier with a quadrature signal. It consists in filtering ( 504 ) this quadrature signal around...
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7280613 |
Method to inject hierarchical data onto single carrier stream
The present invention involves a transmitter for transmitting two levels of data in a hierarchical transmission system. The transmitter has encoders, a modulator, an adjuster, and an up converter....
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7274753 |
Method of implementing modulation and modulator
A transmitter in which modulator output signal values are generated by a multi-level modulation method. The transmitter comprises a look-up table for storing a pre-defined number of values...
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7269232 |
Device for producing a phase and amplitude modulated radio frequency signal
The invention concerns a device for producing a phase and amplitude modulated signal (G) suitable for radio transmission via an antenna ( 30 ), based on the EER technique and means ( 20 ) for...
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7269229 |
Reduced memory architecture for edge modulator
The present invention is a filtering apparatus in an 8 Phase Shift Keying (8PSK) system. The filtering apparatus comprises a π/16 phase shift module, a weight distribution module, and a...
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7248647 |
Radio telecommunications system operative by interactive determination of soft estimates, and a corresponding method
A system to communicate digital data symbols with higher than QPSK modulation comprises a transmitter and receiver. The transmitter comprises, a modulator and circuitry to split and encode the data...
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7248639 |
Method for reducing the out-of-band emission in AM transmitters for digital transmission
A method for reducing out-of-band emission in an AM transmitter for digital transmission includes generating, from a digital modulation signal, an amplitude signal and a phase-modulated radio...
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7236543 |
Method and apparatus of 8PSK modulation
8PSK modulation methods and apparatuses are provided. In a first embodiment, product factors of symbol vectors and a coefficient of a shape filter are stored in a table and compressed by 8 times...
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7224237 |
Modulator and correction method thereof
The invention concerns a wideband modulator using a PLL synthesizer, which can match the frequency characteristic and prevent degradation in modulation accuracy even in the presence of a variation...
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7221908 |
Radio communication apparatus
A communication apparatus operating under a back scattering system involving processes of QPSK modulation is provided. The apparatus includes: a first signal channel for acquiring a first reflected...
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7205859 |
Method and apparatus for sub sample-per-symbol demodulator for a spectrally efficient waveform with an LPI feature
An apparatus and method for transmitting and receiving a communication signal includes selecting a pulse shape for a continuous phase modulated waveform, encoding specific information into the...
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7197087 |
System and method for differential IQ delay compensation in a communications system utilizing adaptive AQM compensation
A system and method for compensating for the time delay between the in-phase I and the quadrature Q paths of a digitally modulated transmitter incorporating an analog quadrature modulator is...
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7187728 |
Coding method and use of a receiver with a convolutional decoder
A coding method for modulating carrier signals with 16 different digital states (4 bit signals) possesses a high synchronicity robustness and an at least partially improved coding gain. The coding...
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7184491 |
Wireless communication apparatus
A linear system and an EER system are used in combination such that the EER system can also be used in a cellular phone with a wide output dynamic range. In the EER system, linear control of an...
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7164328 |
Direct digital amplitude modulator
Various embodiments of a direct digital amplitude modulator (DDAM) for modulating radio frequency (RF) or intermediate frequency (IF) or baseband signal with the invented interpolation technique...
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7164327 |
Compensation of the IQ phase asymmetry in quadrature modulation and demodulation methods
A simplified compensation matrix is set up for the compensation of phase errors between the I and the Q component in data transmission systems with quadrature modulation or demodulation. This...
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7151805 |
System for generating an analogue I/Q signal from two or more data streams
A system and method for generating an I/Q signal for an I/Q modulator ( 10 ). The signal is composed of two or more data streams, which have been edited according to identical or different...
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7138882 |
Architecture for universal modulator
A universal modulator architecture for generating various band efficient waveforms, such as QPSK 8 PSK, 16 PSK, 16 QAM, 12/4 QAM, 32 QAM and 64 QAM and higher. The modulator includes one or more...
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7120204 |
Waveform generator operable in accordance with a plurality of band limitation characteristics
A waveform generator comprises waveform generating means for generating a waveform signal band-limited using a first band limitation characteristic in accordance with the input signal series,...
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