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7627059 |
Method of robust timing detection and carrier frequency offset estimation for OFDM systems
A symbol detector for an OFDM receiver determines the correlation of corresponding samples of at least two received preamble symbol samples, one of the samples delayed a predetermined duration with...
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7627046 |
Waveform generation for improved peak-to-average amplitude ratio
Method and apparatus for peak-to-amplitude ratio reduction are described. A data carrying signal waveform with sub-carrier signals (S 1 - 1 through S 1 -M) is obtained. An initial peak reduction...
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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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7599418 |
Method and apparatus for a frequency hopper
A method and system for generating a frequency hopping electromagnetic signal based on a baseband data signal includes a frequency hopping pre-compensator. The frequency hopping pre-compensator...
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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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7542520 |
Apparatus and method for implementing a low complexity digital modulator
A low complexity digital modulator, which is particularly useful for providing Gaussian frequency shift keying (GFSK) modulation, includes a filter, an integrator and a look-up table (LUT) stage....
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7495520 |
Modulation device using frequency-shift keying
A frequency-shift modulation device includes an oscillating circuit, a phase-locked loop and a digital frequency modulation circuit. The oscillating circuit is connected to the phase-locked loop in...
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7474709 |
Frequency shift keying modulator and applications thereof
An FSK modulator and applications thereof are disclosed. The FSK modulator comprises a phase-locked loop, a frequency divider module, an image rejection mixer and a summing module. The phase-locked...
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7474608 |
Method for signaling information by modifying modulation constellations
Methods and systems for communicating in a wireless network may distinguish different types of packet structures by modifying the phase of a modulation constellation, such as a binary phase shift...
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7463698 |
Transmitter and transmission control method
A transmitter has a peak reducing part carrying out peak reduction processing; an OFDM signal generating part generating an OFDM signal from an input information signal; a cyclic shifting part...
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7447277 |
Ofdm demodulation device
An OFDM receiver ( 1 ) is provided which includes a clock-frequency error calculation circuit ( 41 ) to calculate a difference in clock frequency between a clock for a received signal and an...
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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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7394862 |
Multi-mode wireless polar transmitter architecture
A radio transmitter within a transceiver includes a digital processor and analog circuitry for modulating and transmitting an outgoing digital signal in multiple modes of operation. The digital...
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7376173 |
Unambiguously encoding and decoding signals for wireless channels
A method encodes a sequence of blocks of input bits to be transmitted over a wireless channel. Each block of input bits is converted to a codeword, and each codeword is mapped to multiple...
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7369629 |
FSK signal demodulation circuit
A demodulation circuit for demodulating an FSK signal comprising a long bit having a long bit period and a short bit having a short bit period comprises a bit boundary detection section for...
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7359456 |
Communication system and communication device
A communication system for transmitting a transmission signal in digital form from a transmitter to a receiver is disclosed. The transmitter includes a modulation part modulating a carrier wave in...
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7308043 |
Scrambled chirp frequency jitter for feature suppression
A method of minimizing detectability of an electronically communicated message is disclosed. A predetermined frequency modulation pattern about a nominal transmission frequency is defined. The...
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7292645 |
Binary transmitter and method of transmitting data in binary format
The present invention provides a binary transmitter. In one embodiment, the binary transmitter includes a data coder that receives and encodes binary data to be transmitted and a modulator that...
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7269228 |
Non-coherent frequency shift keying transmitter using a digital interpolation synthesizer
A non-coherent frequency shift keying transmitter for up-converting a baseband signal to a radio frequency signal is provided. The non-coherent frequency shift keying transmitter applies the...
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7263137 |
Multivalued FSK modulation system
A multivalued FSK modulation system is provided in which when data to be transmitted is multivalued and transmitted/received, the detection level is different every symbol. When a two-valued signal...
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7249008 |
Arrangement for runtime compensation of a runtime difference arising through emulation of a high frequency signal
An arrangement for runtime compensation of a runtime difference, arising through emulation of a high frequency signal, is disclosed, with a signal x(t), for emulation by a signal processing device,...
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7239625 |
Low-cost noise-immune wireless methodology for demand control ventilation (DCV) Applications
A method for reducing the cost of demand control ventilation applications deploys wireless CO2 sensors inclusive of relative humidity and temperature throughout an indoor space without the need for...
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7231190 |
Method and apparatus for terminating reception in a wireless communication system
A receiver front end ( 302 ) receives a known Stop Waveform ( 114 ) comprising a predetermined symbol pattern on a voice channel, the Stop Waveform sent at the end of a transmission. A processor (...
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7200184 |
Data dithering apparatus and method
A waveform having an amplitude that varies to thereby represent corresponding data values is dithered to further shape the waveform so that use of the dithered waveform to create a corresponding...
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7129802 |
Method for estimating a carrier leak, an estimator and modulation system provided with automatic control of a carrier using said system
The invention relates to a method of estimating a carrier leak making it possible to solve the accuracy degradation problem associated with a poor reception by the central carrier. A subject of...
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7123666 |
Gaussian minimum shift key transmitter with feedforward phase compensation
A method and apparatus for generating a burst FSK signal having precisely shaped transitions between modulation states. The apparatus uses feedforward compensation of phase gain and phase...
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7123665 |
Method and apparatus for measuring phase error of a modulated signal
A method and apparatus for generating a burst FSK signal having precisely shaped transitions between modulation states. The apparatus uses feedforward compensation of phase gain and phase...
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7103113 |
Analog FSK modulator for a radio transmitter
A transceiver includes a transmitter portion with an analog modulator that modulates data using frequency shift keyed (FSK) modulation techniques to increase efficiency, reduce power consumption,...
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7103108 |
Digital signal processor transceiver
A digital signal processor transceiver uses a finite impulse response filter memory to construct a phase integrated angle at each clock cycle. The FIR filter memory is addressed by a multibit...
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7076217 |
Integrated radio transceiver
A radio transceiver comprises a reception path, a transmission path, and a frequency generator with a programmable phase lock loop. The reception path, the transmission path, and the frequency...
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7058114 |
Wireless device and method
A high speed Bluetooth system with switch-to quadrature amplitude modulation allows for simple mobile devices with video data rates in applications such as Internet downloading. Mobile devices may...
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7027524 |
Method of transmitting and receiving QPSK digital signals
A method of transmitting QPSK digital signals in which each 2-digit binary number, referred to as a symbol, is assigned a phase of a carrier, and symbols are added to enable error correction at the...
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7026864 |
Non-coherent FSK demodulator
A non-coherent frequency shift key demodulator comprising an oversampling device, a chain of registers, and a threshold device is disclosed. The oversampling device receives an input digital...
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7016429 |
Training sequences for peak to average power constrained modulation formats
A method and apparatus are provided that generate, transmit, or receive a training sequence in a communications system, where the training sequence exhibits certain desirable characteristics when...
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7015749 |
Frequency discriminator using replica compensated delay lines and method of operation
A frequency discriminator for detecting phase shifts between sequential pulses in a frequency-shift keyed (FSK) signal having a nominal frequency, f. The frequency discriminator comprises: 1) a...
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6862313 |
Direct conversion spread spectrum time division duplex radio
A wireless transceiver comprises a digital to analog converter having an input for receiving a digital representation of a direct sequence spread spectrum signal and having an analog output. A...
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6785514 |
Method and radio station for transmitting information
A method and radio station for transmitting information, wherein frequency channels of a frequency band are arranged in accordance with a first coarse raster system and a second fine raster system,...
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6690741 |
Ultra wideband data transmission system and method
A data-modulated ultra wideband transmitter that modulates the phase, frequency, bandwidth, amplitude and/or attenuation of ultra-wideband (UWB) pulses. The transmitter confines or band-limits UWB...
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6600382 |
Microwave phase modulator
A phase modulator for direct wideband linear phase modulation of a microwave continuous wave carrier signal which is suitable for many analog and digital phase or frequency modulation techniques....
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6546060 |
Direct modulating FSK transmitter for MCA
A direct modulating frequency shift keying transmitter for multi channel access is constructed so that a transmission signal from a voltage controlled oscillator (VCO) in a phase lock loop...
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6480553 |
Gaussian frequency-shift keying transciever for ISM wideband communication
A GFSK (Gaussian Frequency Shift Keying) radio transceiver is provided for ISM (Industrial Scientific and Medical) wideband communication. The GFSK radio transceiver includes a transmitter for...
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6452461 |
High-speed power-efficient coded M-ary FSK modulator
A high-speed power-efficient coded M-ary Frequency-Shift Keying (M-ary FSK) modulator. The modulator includes a coding logic, which generates (M/2) Gray code signals in accordance with an (N−1)...
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6449317 |
Digital synthesizer
The present invention is a method and system for processing communication signals in a wireless telecommunication system having at least two subscriber units. The subscriber units communicate with...
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6438176 |
Digital gaussian frequency shift keying modulator
A GFSK modulator suitable for use in an RF communication system comprising a modular subsystem and a baseband processor subsystem which is implemented digitally. The baseband processor subsystem...
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6434135 |
Adaptive RF amplifier prelimiter
The invention reduces transient peaks in signals transmitted in CDMA communication systems. A plurality of spread spectrum data signals are combined into a combined signal having fluctuating power...
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6418174 |
Frequency shift key modulator
The present invention provides an FSK modulation circuit and technique that controls a prescaler to generate an FSK output. In particular, a VCO output is sent to a prescaler controlled by a...
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6411646 |
Direct conversion time division duplex radio, direct sequence spread spectrum cordless telephone
A wireless transceiver comprises a digital to analog converter having an input for receiving a digital representation of a direct sequence spread spectrum signal and having an analog output. A...
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6396355 |
Signal generator having fine resolution and low phase noise
A signal generator includes an oscillator, a phase locked loop and a fractional divider. The oscillator is configured to provide an output signal. The phase locked loop is configured to receive the...
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6392499 |
Frequency shift modulation circuit
A frequency shift modulation circuit has a direct digital synthesizer DDS and a phase-locked loop PLL. DDS stores output signal frequency data in a plurality of registers. DDS selects the register...
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6366772 |
Caller identification delivery in a wireless local loop or other systems
A method of communicating FSK-modulated Caller ID signals through a network incompatible to the transmission of these signals is presented. A first network component couples between the...
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