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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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7532678 |
Method for transmitting data by multi-carrier modulation
During data transmission by multi-carrier modulation of data blocks modulated by Inverse Discrete Fourier Transformation (IDFT), carriers that are not occupied by data are occupied in such a way as...
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7508890 |
Apparatus and method for FSK demodulation with integrated time and frequency tracking
An FSK receiver comprising: 1) demodulation circuitry for receiving an incoming FSK signal and generating a baseband signal comprising an amplitude modulated symbol stream, of Logic 0 symbols and...
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7505506 |
System and method for generating single sideband, constant envelope, spread spectrum signals with multiple spreading codes
A method of generating a composite signal includes the steps of: (a) generating a plurality of sub-carriers, each sub-carrier having a different frequency position in a frequency spectrum; (b)...
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7474147 |
Frequency shift keying signal demodulator method and apparatus
A method and apparatus for a frequency shift keying (FSK) demodulator use a configuration to improve the autocorrelation for better receiver performance. The demodulator uses parallel first and...
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7463682 |
Coding method for binary digits coding and its circuit for digits transmission
This invention presents a coding method for binary digits coding and its circuit for digits transmission. With this coding method, the binary digits are corresponding to a sequence of pulse groups....
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7457370 |
Frequency staggered frequency shift keying modulation
A frequency modulation method is proposed that enables an imprinting of a digital message formed by a sequence of symbols on a set of frequency bands. Each symbol of the digital message is hereby...
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7450902 |
Continuous phase frequency shift keying modulation during wireless transmissions in a closed system while minimizing power consumption
Continuous phase frequency shift keying modulation is employed during wireless transmission from an internal device to an external device to increase robustness of transmissions. The continuous...
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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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7436263 |
Apparatus and method for presenting a modulated output signal at an output locus
An apparatus that presents an output signal that is modulated by input signal includes: (a) A signal source providing a signal at a reference frequency. (b) A frequency comparer coupled with the...
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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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7421252 |
Center frequency control of an integrated phase rotator band-pass filter using VCO coarse trim bits
A phase rotator for a Cartesian feedback power amplifier in a transmitter final stage contains an integrated voltage controlled tunable resonant circuit accomplishing band-pass filtering at a...
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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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7372914 |
Control system methods and apparatus for inductive communication across an isolation barrier
Improved control apparatus and methods transfer information between devices, such as controllers and field devices, utilizing a modulator that generates a pulse width modulated (PWM) signal...
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RE40254 |
Method and system for realising a fast control channel in a cellular radio network
Signalling information is conveyed from a transmitting device ( 101 ) to a receiving device ( 102 ) in a cellular radio network where user data transmission takes place on a traffic channel in...
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7349488 |
Frequency 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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7298788 |
Wireless communication system and method
A communication system including a first device transmitting a modulated signal and a second device receiving the modulated signal. The second device can include a first demodulator and a second...
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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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7269233 |
Algorithm of bit synchronization for a digital FSK correlation receiver
An algorithm for bit synchronization in a frequency shift keying (FSK) receiver. In the algorithm, a training sequence is received from a transmitter. The training sequence has a plurality of bits....
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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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7245930 |
Acquisition mechanism for a mobile satellite system
A method for enabling synchronization of a communications terminal in a wireless communication system, and a corresponding acquisition system of the communications terminal, wherein the method...
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7239675 |
GFSK receiver
A method for synchronizing a receiver to a stream of transmitted symbols that includes a known synchronization word. The method includes receiving a signal in which the symbols, including the...
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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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7088267 |
Duplex-system digital-data transmitting method and apparatus
A duplex-system digital-data transmitting apparatus includes a digital-data signal source which outputs serial data at a signal output end. The level of the data is converted by a first level...
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7079814 |
Estimation of movement
A mobile transceiver and a method of detecting movement of the mobile transceiver in a radio system. The radio system includes at least one base station and terminals. The movement of the mobile...
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7079600 |
FSK demodulator using DLL and a demodulating method
A system and method are disclosed for providing a FSK demodulator using DLL and a demodulating method which detects a time order of the rising edges of square waves that correspond to two...
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7068725 |
Bit detection threshold in a TDMA burst communication system
A method is disclosed for optimally adjusting the received bit detection threshold in a digital communication system, such as a TDMA system that is characterized by very short duration burst...
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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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7057543 |
Low power method and interface for generating analog waveforms
A low power analog output circuit is disclosed that utilizes a low pass filter driven by a bit stream to render a waveshaped output signal based upon a raw digital data signal. The analog output...
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7031736 |
Method and apparatus of header compression for broadcast services in radio telecommunication system
A method and apparatus for packet-data header decompression, particularly advantageous for use in connection with broadcast and multicast messages being transported through a radio...
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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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6993097 |
Demodulation method and demodulator for CPFSK-modulated signals
In a method for estimating a sequence of input data symbols of a CPFSK-modulated data signal transmitted via a faulty channel, in the course of an ACS operation for calculating a transition metric...
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6983160 |
Base site and method for GPS-based regional time synchronization
To address the need for an apparatus and method of economically synchronizing base sites ( 110–113 ) in wireless communication systems, the present invention provides a GPS-based solution for...
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6937666 |
Wideband digital radio with transmit modulation cancellation
A microwave radio assembly is described including a directional antenna wherein the installation and aiming is simplified. The assembly is attached to the wall-mount fix via gimbals mechanism with...
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6931089 |
Phase-locked loop with analog phase rotator
A phase-locked loop includes a phase detector which receives an input signal and a first internal periodic signal and provides a phase signal indicative of a phase difference between the input...
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6901246 |
Suppressed cycle based carrier modulation using amplitude modulation
A sinusoidal RF carrier is modulated for the transmission of digital binary data streams through the amplitude suppression of carrier wavelets. These wavelets are defined between zero crossover...
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6865235 |
Multi-protocol modulator
A multi-protocol modulator capable of supporting two or more different modes of operation, each mode of operation corresponding to a different type of modulation, comprises an m-level phase shift...
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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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6853687 |
Proximity-based magnetic field generator for controlling operation of RF burst-transmitting tags of geolocation system
An object tracking system for locating radio-tagged objects within a monitored environment has a plurality tag transmission readers that detect RF transmissions from the tags, and generate output...
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6845103 |
Apparatus and method for controlling initialization of a DMT system
An apparatus for controlling initialization of a discrete multi-tone (DMT) system is provided in which a connection between first and second devices is acknowledged by using a plurality of...
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6842519 |
Communication with current detection
Apparatuses and methods are disclosed for communications using current detection. According to one embodiment, a transmitter generates a signal on a transmission line by switching between two power...
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6831953 |
Method of, and a radio terminal for, detecting the presence of a 2-FSK signal
A method of, and terminal for, detecting the presence of a 2-FSK signal, the method comprising receiving ( 10 ) a 2-FSK signal, quadrature frequency down-converting ( 34,35,36 ) the received signal...
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6816559 |
FSK modulation transceiver
An FSK transceiver circuit, including a controlled oscillator used, in a transmission mode, to modulate a carrier by frequency shifts according to a binary transmission signal present on an input...
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6785347 |
Nonlinear-least squares based method and apparatus for FSK signal decoding
Disclosed is a method and apparatus for receiving FSK signals using estimation theory. A received signal is filtered to obtain energy estimates for a first frequency corresponding to a binary...
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6774738 |
Trimming method for a transceiver using two-point modulation
In a method for amplitude trimming in transceivers having a PLL circuit operating on the two-point modulation principle, the amplitude of an analog modulation signal is selected on the basis of a...
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6688714 |
Bit-rate modification
The bit rate of a data stream having the following characteristics is modified. The data stream includes control words, each of which defines when a data portion of the data stream has to be read...
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6650712 |
Low complexity method and apparatus for FSK signal reception
Disclosed is an apparatus and method for low complexity, phase independent reception of FSK signals. A finite series of delay elements produces a plurality of equidistant samples of a received FSK...
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