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7619487 |
Polar modulation without analog filtering
This disclosure relates to systems and methods for polar modulation without analog filters. Digitals filters, a second order hold interpolator and a reconfigurable third order noise shaper can be...
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7606596 |
Exploiting multiuser diversity through phase modulation multiplexing
A method and apparatus for combining signals of multiple users onto a common channel is disclosed. In one embodiment, the method comprises identifying one or more traffic channels that are of one...
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7599627 |
Method and system for a polarization mode dispersion tolerant optical homodyne detection system with optimized transmission modulation
An optical homodyne communication system and method in which a side carrier is transmitted along with data bands in an optical data signal, and upon reception, the side carrier is boosted, shifted...
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7593698 |
Large signal polar modulated power amplifier
Polar modulation input signals to a polar modulated power amplifier include a phase modulated (PM) input signal, which feeds a power amplifier input, and an amplitude modulated (AM) input signal,...
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7586880 |
Method of detection of signals using an adaptive antenna in a peer-to-peer network
An adaptive antenna signal identification process to provide increased interference rejection in a wireless data network, such as a wireless Local Area Network (LAN). An adaptive antenna, such as a...
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7573949 |
Transmitter circuit, transmission method, and communications device using the transmitter circuit
Provided is a transmitter circuit capable of outputting a transmission signal having high accuracy irrespective of bandwidth and operating with high efficiency. In the transmitter circuit 1 , a...
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7570928 |
System and method for low delay corrective feedback power amplifier control
A system for controlling the power output of a power amplifier includes a power amplifier through which a transmit signal having an amplitude-modulated (AM) component and a phase-modulated (PM)...
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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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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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7548593 |
Baseband compensation of an offset phase locked loop
A phase modulator faithfully reproduces higher frequency modulation using an offset phase-locked loop (OPLL) without passing excessive noise through an increased bandwidth of the OPLL. A quadrature...
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7532696 |
Calibration device for a phased locked loop synthesiser
A calibration device for a phase locked loop arranged to generate an output frequency based upon a first frequency range of an input signal applied to a first input and a second frequency range of...
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7532682 |
Quadrature modulation without carrier
Transmitters, receivers and associated methods are disclosed for providing phase and amplitude modulation in a carrier-less communication system (e.g., an ultra-wide band communication system). An...
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7532673 |
Transport of modulation symbols in a communications system
A broadband communications system uses modulation symbol transport over communications links to replace baseband or bandpass signal transport, thereby providing longer communication distances,...
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7525398 |
Acoustically communicating data signals across an electrical isolation barrier
In one aspect, a data communication system includes a modulator, an integrated acoustic data coupler, and a demodulator. The modulator modulates a carrier signal having a frequency in an operating...
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7522672 |
Digital branch calibrator for an RF transmitter
The present invention provides a digital (computational) branch calibrator which uses a feedback signal sensed from an RF transmit signal path following the combining stage of LINC circuitry of a...
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7515650 |
Quadrature modulation compensation
The present invention is related to methods and apparatus that compensate for quadrature impairments of an analog quadrature modulator and/or demodulator over a relatively wide signal bandwidth....
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7508884 |
System and method for communicating data using constant amplitude equalized waveform
A system communicates data and includes an encoder for encoding communications data with a forward error correction code. A data randomizer randomizes the communications data with a random bit...
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7499490 |
Encoders for block-circulant LDPC codes
Methods and apparatus to encode message input symbols in accordance with an accumulate-repeat-accumulate code with repetition three or four are disclosed. Block circulant matrices are used. A first...
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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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7469020 |
Systems, methods, and apparatus for reducing dynamic range requirements of a power amplifier in a wireless device
Systems, methods, and apparatus for reducing dynamic range requirements of a power amplifier in a wireless device are provided. An exemplary method may include modulating a symbol stream to...
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7466965 |
Transmission method and transmitter circuit
An amplitude component of a modulating signal is detected, band-divided by first and second frequency selecting circuits, and an amplitude component of a high-frequency band is down-converted by a...
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7466747 |
Method and apparatus for wireless data transfer
A method and apparatus for wirelessly transmitting data between two devices ( 101. 102 ) is provided herein. During data transmission, a data and a strobe signal are transmitted simultaneously on...
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7463693 |
Apparatus and method for full-diversity, full-rate space-time block coding for two transmit antennas
An apparatus and method for full-diversity, full-rate space-time block coding in a transmitter using two Tx antennas are provided. An input symbol sequence is STBC-encoded in a predetermined method...
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7443261 |
Phase modulating apparatus, communication device, mobile wireless unit, and phase modulating method
A multimode-based phase modulating apparatus capable of reducing the degradation of modulation precision and suppressing the unnecessary power consumption. This apparatus has a switch for switching...
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7440515 |
System and method for controlling modulation
A system and method for controlling modulation. The system includes a plurality of modulators and a transmitting unit. The plurality of modulators decodes data from a data signal and also encodes...
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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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7433653 |
Transmitter and semiconductor integrated circuit for communication
A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for...
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7424274 |
Digital transmitter and method
A transmitter and method is provided for digitally upconverting a baseband digital signal to a modulated intermediate frequency (IF) digital signal and sigma-delta modulating the IF digital signal....
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7409002 |
Signal modulation
According to an embodiment of the invention, a method and apparatus for signal modulation are described. According to an embodiment of the invention, a method comprises producing and transferring a...
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7403574 |
Simplified scrambling scheme for satellite broadcasting systems
A simplified scrambling scheme that unifies all signals of a satellite broadcasting system, including frame header ( 404 ), frame body ( 402 ) and pilot symbols ( 408 ) with a common reference...
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7394869 |
RF transmitter architecture for continuous switching between modulation modes
The present invention provides a radio transmitter having a digital modulator that further includes logic for continuous amplitude and continuous phase modulation switching in an RF transmitter...
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7363013 |
Phase lock loop applying in wireless communication system and method thereof
A phase lock loop receives a baseband signal which has an input frequency, and modulating the baseband signal to be a corresponding RF signal which has a predetermined transmission frequency for...
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7362824 |
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...
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7359457 |
Transmission apparatus, reception apparatus and digital radio communication method
A transmission apparatus includes a frame configuration determiner that determines a modulation system from among a plurality of modulation systems on a communication situation. A first symbol...
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7359455 |
Digital modulation and shift keying
The present invention discloses an apparatus and a method of modulating a carrier with digital information having a series of datums represented in a plurality of symbols, the method comprising...
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7356092 |
Wireless communication system and communication semiconductor integrated circuit device
When a transmitting oscillator is built in a communication semiconductor integrated circuit device like a high-frequency IC constituting a wireless communication system, the system prevents...
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7346125 |
Method and device for pulse shaping QPSK signals
A baseband shaping device includes a plurality of coefficient memories, each memory having an input address bus, a multiplexor input and a coefficient value output. The device further includes a...
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7336721 |
Digital frequency modulator
A digital frequency modulator is disclosed. In the digital frequency modulator, a first gain controller multiplies an input digital signal by a first gain determined according to a required...
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7333780 |
Polar modulation transmission apparatus and radio communication apparatus
A polar modulation transmission apparatus is provided which can adjust synchronization between an amplitude signal and phase signal in a simple configuration accurately and automatically. A polar...
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7327991 |
Pulse modulation circuit
Provided is a pulse modulation circuit that improves the on/off operation and improves the on/off ratio of an output power of the entire pulse modulation circuit in the switching operation. The...
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7324787 |
Method of ramping up output level of power amplifier of radio communication system, communication semiconductor integrated circuit, and radio communication system
In a radio communication system having a phase control loop for phase modulation and an amplitude control loop for amplitude modulation and being capable of time divisional transmission and...
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7321640 |
Active polyphase inverter filter for quadrature signal generation
A quadrature signal generator receives a differential input signal and generates quadrature output signals that are 90 degrees out-of-phase with each other. The quadrature generator includes a...
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7315582 |
Backward compatible DVB-S standard transmission system
The invention relates to digital transmissions. It particularly relates to a new transmission system (DVB-S2), which is backward compatible with a primary transmission system (DVB-S), enabling a...
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7308240 |
Numerical control oscillator, digital frequency converter and radio frequency unit
A numerical control oscillator (NCO) for reducing a circuit size and power consumption while maintaining a desired frequency deviation, and suppressing generation of a spurious as much as possible....
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7305046 |
I/Q modulator with carrier predistortion
An I/Q modulator used for processing an I/Q signal to obtain a predistorted output signal. The I/Q signal has an I component and a Q component, and comprises a predistorter for predistorting, with...
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7302011 |
Quadrature frequency doubling system
The frequency doubler of the present invention operates to provide an in-phase signal and a quadrature signal, each having a frequency equal to twice the frequency of a reference signal. The...
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7274754 |
Method and apparatus for frequency division multiplexing
A radio transmitter and receiver arrangement includes a transmitter and a receiver. The transmitter generates an electromagnetic carrier that varies in frequency throughout a channel interval, and...
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7248842 |
Wireless communication apparatus having a phase control loop shared by first and second modulation modes and an amplitude control loop
A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for...
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7245180 |
Intelligent RF power control for wireless modem devices
A bypass circuit is disclosed for use with lower power supply voltage PC cards. The bypass circuit controls the power supply voltage fed to a power amplifier when switching between a lower power...
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7230993 |
Method and apparatus for modulation using an at least four-dimensional signal constellation
A digital communication system ( 20 ) in which a signal constellation ( 30 ) of a dimensionality of at least four is used, with distance properties chosen to reduce the bit error rate compared to...
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