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7313170 |
Spread spectrum receiver
A signal generation/noise extraction unit that includes an analog-to-digital converter, a switch, a filter, a subtracter, an oscillator, a multiplier, and a switch generates a down-sampled signal...
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7310368 |
Means for initiative synchronization and cell searching based on the CDMA system of multipath energy window
The present invention discloses an apparatus for initial synchronization and cell search in a CDMA system based on multipath energy window. The apparatus perform initial synchronization and...
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7310394 |
LMMSE-based RAKE receiver with channel tap assignment
Methods of recovering data in a received signal sent in a communications media are disclosed. Composite channel impulse responses are first estimated. Channel-tap locations are then assigned to...
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7308022 |
Parameter estimator configured to distinguish between peaks and sidelobes of correlation function
A parameter estimator for estimating one or more parameter(s) from a signal is described. A correlation function is derived from the signal, and the correlation function analyzed to determine if...
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7308019 |
System and method for Fast Walsh Transform processing in a multi-coded signal environment
A flexible Fast Walsh Transform circuit provides configurable FWT sizes, and is suitable for use in radio receivers where the received signal may be generated using varying spreading codes and/or...
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7301991 |
Fading frequency decision device and method
Fading frequency decision device and method are provided. An inner product value of pilot symbols which are time multiplexed in a control channel which is parallel multiplexed with a data channel,...
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7302017 |
System and method for adaptive matched filter signal parameter measurement
A robust and flexible system for signal parameter measurements in the field of signal processing dynamically uses signal parameters from previous signal detections and parametric priorities to...
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7298785 |
Multicarrier demodulation method and apparatus, and multicarrier modulation method and apparatus
A method and apparatus for receiving a modulated signal which consists of N subcarriers containing N-L (L<N) nullcarriers and in which an effective symbol has a length T, and a frequency...
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7298808 |
Cascaded jitter frequency shifting Δ-Σ modulated signal synchronization mapper
The invention provides a synchronizer incorporating a Δ-Σ modulator (i.e. a bit stuffing command generator), coupled in series with a frequency offset measurement block and a frequency-locked...
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7298799 |
All-tap fractionally spaced, serial rake combiner apparatus and method
A decision processor for 802.11b codewords for 1 Mb and 2 Mb data rates includes a sliding correlator for the acquisition of correlation peaks. During a training interval, these correlation peaks...
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7299017 |
Communication method, receiver and base station
A multi-user receiver which uses at least two antenna elements and in which the influence of interference is reduced, the receiver comprises: means ( 200 ) for pre-filtering a wideband antenna...
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7298773 |
Apparatus and method for reporting service load to mobile station in mobile telecommunication system
There is provided a method and apparatus for selecting an appropriate base station and an optimal data rate to provide a voice service and a data service based on a voice service load in a CDMA...
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7295624 |
Wireless system with hybrid automatic retransmission request in interference-limited communications
A wireless receiver for receiving signals from an interference-limited transmitter in an interference-limited system comprising at least one transmit antenna, wherein the signals comprise a...
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7295633 |
Triple multiplexing spread spectrum receiver
A GPS car navigation system derives GPS position update information from motion of the car along the actual track. Turns along the track are detected when they actually occur and are compared with...
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7295601 |
Method and apparatus for performing digital timing recovery on oversampled 802.11b baseband signals
An apparatus and method for performing digital timing recovery includes a rotating demultiplexor receiving a four times oversampled baseband signal and providing four downsampled phases at...
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7292659 |
Correlating and aligning monitored signals for computer system performance parameters
One embodiment of the present invention provides a system that facilitates aligning a first signal with a second signal in a manner that optimizes a correlation between the first signal and the...
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7289580 |
Channel estimator using one or more correlation reference vectors to eliminate data related noise
An impulse response of a channel is estimated by correlating a received signal with a stored vector. The received signal contains a training sequence having a length L tr , the stored vector has a...
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7289779 |
Method for calibrating the frequency of an RF oscillator in a mobile part of a mobile communications device
A method is provided for calibrating the frequency of an RF oscillator in a mobile part of a mobile communications device when the mobile part is first switched on, wherein the method includes the...
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7283600 |
Procedure for seizing the beginning of an active signal section
A process for detecting initiation (BB) of an active packet or burst in a digital received signal r(v) during use of a digital reference signal p(v) includes: (a) executing a correlation (S 102 , S...
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7280581 |
Method of adaptive Walsh code allocation
A method of adaptive Walsh code allocation in a wireless communication system. The method includes the step of each voice user transmitting quality condition signal, such as a pilot signal strength...
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7280624 |
Method and apparatus for noise threshold calculation in wireless communication
Determination of the impulse position in a multipath channel in a noisy environment includes dynamically adjusting a threshold value when making comparisons against a signal property level.
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7280615 |
Method for making a clear channel assessment in a wireless network
A method is provided for performing a clear channel assessment in a wireless network. The method involves first listening for channel energy on a wireless channel. Whatever channel energy is heard...
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7280623 |
Digital RF correlator for multipurpose digital signal processing
Digital RF correlation based signal processing arrangements allow for the development of software—controlled radio reception without the need for down-conversion to IF frequencies. Various...
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7280588 |
Correlation module for use in a radio receiver
A correlation module includes a plurality of first functional modules, a plurality of second functional modules, a plurality of function adjust modules, a summation module, a correlation value...
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7280582 |
Apparatus and method for sub-chip offset correlation in spread-spectrum communication systems
An embodiment of the present invention described in the specification and the drawings is an apparatus and method for code correlation in spread spectrum communication systems. The apparatus...
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7277476 |
Determining the correlation between received samples and available replica samples
The invention relates to a method, a processing unit and a system for determining the correlation between samples of a received code modulated signal and samples of replica code sequences. In order...
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7274757 |
Autocorrelation threshold generation based on median filtering for symbol boundary detection in an OFDM receiver
An OFDM receiver has an autocorrelation circuit configured for generating autocorrelated power values from samples of received short preamble symbols in a received data packet, and a median filter...
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7274758 |
Coarse frequency estimation in an OFDM receiver based on autocorrelation of accumulated samples
An OFDM receiver has an autocorrelation circuit configured for generating an autocorrelation result from samples of received short preamble symbols in a received data packet, where the...
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7272198 |
Method and apparatus for complementary code keying
A method of decoding data includes receiving a symbol and determining a data rate that was used to encode the symbol. A set of correlator output signals are generated based on a first mode when a...
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7269206 |
Flexible correlation for cell searching in a CDMA system
Within a synchronization stage, m candidates are selected according to secondary correlation results that are generated in a standard code group and slot number identification process. Each...
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7266165 |
Code distinguishing apparatus
A unique word that can be contained in transmittal data is to be accurately distinguished. A correlation detecting section 36 calculates correlations A through N between received data containing...
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7257174 |
Method for processing a digital input signal of a channel equalizer
A baseband digital signal block is processed at an output of a matched filter and at an input of a channel equalizer. This signal is fed to a whitening filter estimated for the block by taking into...
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7257175 |
Method and apparatus for periodic signal detection in OFDM/DMT systems
A method for detecting a periodic signal in a communication system. The method includes converting a time domain digitized signal to obtain a corresponding frequency domain digitized signal,...
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7254193 |
Channel estimation sequence and method of estimating a transmission channel which uses such a channel estimation sequence
A channel estimation sequence (S E ) embedded in a carrier wave and configured to be transmitted by a transmitter ( 1 ) to a receiver ( 2 ) via a channel ( 3 ) to implement a channel estimation...
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7254200 |
System and method for frequency burst detection for GSM/GPRS
A system, method and computer program product for detecting a frequency burst in a received signal at a wireless receiver is disclosed. The invention predicts the current sample of the received...
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7251268 |
Rake receiver
A Rake receiver suitable for receiving, for example, direct sequence CDMA signals, in which the pilot code used to correlate the received signal in each Rake finger (RF 1 , RF 2 , RFN) is...
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7251299 |
Time delay estimator
A system for time delay estimation in a discrete time processing system includes a cross correlator that performs cross correlation on a first signal and a second signal, and provides a cross...
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7248659 |
Method for adjusting acquisition speed in a wireless network
A method is provided for acquiring incoming signals in a wireless network device. This method uses three different types of preamble: a normal preamble, a short preamble, and a long preamble. One...
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7248619 |
Rake receiver and receiving method
In a rake receiver, a correlation-value calculation section calculates correlation values between spreading codes and reception signals from an input terminal and outputs the calculated correlation...
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7248652 |
Method and apparatus for recovering timing information in orthogonal frequency division multiplexing (OFDM) systems
An improved OFDM receiver is disclosed that repositions peaks in an OFDM frame to a desired position away from the frame boundary to reduce the probability of timing ambiguity. Each OFDM frame is...
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7245654 |
Carrier sensing, signal quality and link quality in a receiver
In a receiver, two low-pass equivalent signal detection criterions when the timing, phase and amplitude of the received signal are known and unknown, respectively, are provided for the detection of...
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7245676 |
Adaptive equalizer
An adaptive equalizer capable of reducing an amount of calculation necessary for signal processing to such a degree that the accuracy of adaptive processing does not deteriorate and thereby...
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7242675 |
Remote terminal spread spectrum CDMA subtractive interference canceller
A spread-spectrum code division multiple access interference canceller employed by a remote terminal for reducing interference in a direct sequence CDMA receiver having N chip-code channels. The...
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7239677 |
Method and apparatus for soft symbol scaling
Methods of scaling path delay values in a communication system, in which estimates of received symbols corresponding to the path delays are combined, include the step of determining a respective...
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7236517 |
Method for determining the spreading sequence of a spread spectrum signal
A system for despreading a spread spectrum signal includes at least one receiver for capturing a plurality of snapshots of the signal and a processing device for constructing a confidence vector...
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7236554 |
Timing estimation in an OFDM receiver
A timing estimation system and methodology are provided. In particular, a first pilot is employed in conjunction with three acquisition stages. In the first stage, an attempt is made to observe the...
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7230976 |
Pre-corrupting reference signals with inter-symbol interference
In one embodiment, an apparatus includes a correlator unit that generates a set of correlator outputs and a codeword selector coupled to the set of correlator outputs to determine a received...
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7230938 |
Method employed by a base station for spread spectrum CDMA subtractive interference cancellation
A spread-spectrum code division multiple access interference cancellation method for a base station reduces interference in a direct sequence CDMA receiver having N chip-code channels. The...
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7215930 |
Method and apparatus for providing uplink signal-to-noise ratio (SNR) estimation in a wireless communication
A method and apparatus for providing uplink signal-to-noise ratio (SNR) estimation in a wireless communication system. A first signal is received over a first channel and a second signal is...
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7212591 |
Methods and receivers that estimate multi-path delays by removing signal rays from a power-delay profile
A method for estimating a plurality of delay values in a multi-path communication signal. Correlation values are generated that correspond to a plurality of delay values associated with the...
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