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6917644 |
Spread spectrum receiver with multi-path correction
A spread spectrum receiver uses a comparison of the magnitude of the code correlation amplitudes at equal power at a one chip spacing to the magnitude at a central position there between to...
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6912245 |
Apparatus for calculating decision parameters in an IMT-2000 system
Improved techniques for calculating decision parameters in an IMT-2000 system is disclosed. In an apparatus for calculating decision parameters, there is provided a correlation value calculation...
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6909742 |
Method and apparatus for reducing interference in a data stream using autocorrelation derived equalization
Compensating for channel response in communications systems. An equalizing system includes a correlation block to calculate a correlation statistic from a received signal. The correlation statistic...
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6909738 |
Method in a receiver and a receiver
The invention relates to a method for acquiring a receiver ( 1 ) into a code modulated spread spectrum signal received by the receiver ( 1 ). In the method at least one replica code (r) is used...
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6907091 |
Segmented architecture for multiple sequence detection and identification with frequency offset compensation
Detection and identification of known sequences such as sequences composed of Walsh-Hadamard sequence and scrambling sequence are provided in a fast fading and frequency offset environment using a...
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6904107 |
Space-weighted communication path estimation
A method of estimating a communication path formed of a plurality of channels, the method necessitating an estimate of the impulse response C 1 , C 2 , . . . , C n of the channels, including the...
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6904081 |
Spread spectrum receiver apparatus and method
A receiver ( 200 ) incorporates in parallel an adaptive minimum mean square error (MMSE) equalizer stage ( 202 ) and a matched filter stage (RAKE) ( 204 ). A selector ( 206 ) is utilized to accept...
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6901104 |
Wirless network
A wireless network is disclosed including at least one base station and a plurality of assigned terminals for exchanging user data and control data. The base station is arranged for transmitting...
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6898755 |
Method for increasing physical layer flexibility in cable modem systems
In a cable modem system, signals are transmitted upstream from a cable modem (CM) to a cable modem termination unit (CMTS) when the subscriber desires to communicate with the headend. The invention...
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6895033 |
Method and apparatus for call recovery after a power cut for a CDMA cellular phone
A first sequence state storage module ( 20 ) periodically stores a present state ( 22 ) of a long code generator ( 30 ). Following a restoration of power after a power cut condition, or following...
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6891886 |
Apparatus for finely synchronizing code signals
An apparatus for finely synchronizing code signals with an encoded received signal includes a sampling device for sampling the received signal at regular sampling intervals, a pulse shaper for...
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6891907 |
Frequency offset correction system and correction method
A frequency offset correction system includes a phase shift estimation unit and correction unit. The phase shift estimation unit estimates a pilot phase shift from pilot signal data for a plurality...
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6891906 |
Demodulator, clock recovery circuit, demodulation method and clock recovery method
A demodulator is constituted by: a clock recovery circuit for generating a recovered clock from the series of received data and outputting the recovered clock; a state estimation circuit for making...
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6891885 |
Correlation circuit for spread spectrum communication
There is disclosed a correlation circuit for spread spectrum communication, which can demodulate users having superposed demodulation phases and equaling or exceeding a sum of products calculation...
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6891881 |
Method of determining an end of a transmitted frame in a frame-based communications network
A method of determining an end of a transmitted frame at a receiver on a frame-based communications network. An end of frame format for the transmitted frame is provided having an end of frame...
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6888882 |
Reducing collisions in a radio communications system
A method and apparatus are provided that allows a predetermined training sequence to be selected from among different choices. According to one aspect of the present invention, the invention...
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6885693 |
Synchronization in digital data transmission systems
A channel estimation method for a digital telecommunication station is disclosed. A frequency correction burst is sought by scanning of the wanted channel. The frequency correction burst is used to...
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6885692 |
Efficient spreader for spread spectrum communication systems
A spreading system and method for CDMA applications that requires fewer integer multiplications. User data is spread using real or complex integer based spreading codes of length SF to SF max ...
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6882692 |
Fast transform system for an extended data rate WLAN system
In a direct sequence spread spectrum receiver an “as received” signal is decoded by correlation. Phase shift key, complementary code key modulated signals are correlated by transforming samples...
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6882682 |
Fixed pattern detection apparatus
A fixed pattern detection device in which the device is fed as a received signal with a pattern of a length of N chips. The received signal is obtained by dividing and re-arraying each of K...
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6876692 |
System for code division multi-access communication
According to the present invention a received Direct Sequence Code Division Multi-Access (DS-CDMA) signal is differentially decoded at the chip level. A number of signaling schemes can be used in...
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6873666 |
Circuit and method for symbol timing recovery in phase modulation systems
The present invention relates to a circuit and method for symbol timing recovery in phase modulation systems. First, phase differences of in-phase signals and quadrature signals in a polar...
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6862323 |
Low pass filters for high dynamic range wideband direct conversion receiver
Disclosed are a low pass filter, and a direct conversion receiver (DCR) implementing the same, which filter and second signal channels with improved phase and gain match, allowing use of the filter...
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6862326 |
Whitening matched filter for use in a communications receiver
A novel and useful whitening matched filter (WMF) for use in a communications receiver. The WMF is constructed by cascading a matched filter and a noise-whitening filter. The response of the...
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6859491 |
Iterative estimation of timing in GSM bursts
A method and apparatus for estimating the timing position of data bursts received in a data stream, where each data burst includes a number of bits comprising a training sequence in a fixed...
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6859485 |
Geolocation system with controllable tags enabled by wireless communications to the tags
An auxiliary wireless communication mechanism is incorporated into a system that geolocates tagged objects within a monitored environment, using random, repetitive spread spectrum emissions from...
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6853693 |
Method and apparatus for gain normalization of a correlation demodulator
A correlation demodulator unit ( 20 ) having gain normalization includes a correlation demodulator ( 12 ) for receiving a signal from a receiver ( 8 ). The correlation demodulator has a plurality...
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6853678 |
Synchronizing circuit
A synchronizing circuit synchronizes a predetermined code with first and second codes different in phase, include: a code generating part outputting phase-shifted code shifted in phase by a...
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6847690 |
Determinant-based synchronization techniques and systems
Systems and methods for processing a received radio signal in a communication system are described. Initial time synchronization is acquired using a trace operator. Then, a number of channel taps...
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6847616 |
Reception apparatus for estimating the state of a transmission channel using a known signal
A transmission channel response calculation section calculates first to n-th transmission channel responses and stores the calculated first to n-th transmission channel responses in a memory...
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6842479 |
Method and apparatus for interference cancellation in a rake receiver
Systems and methods for despreading received spread spectrum signals are described. Despreading can be performed using both channel estimates and impairment correlation estimates. Techniques for...
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6842480 |
Programmable matched filter bank
A programmable matched filter bank comprises a sliding integrator and compensation calculation circuits. The integrator receives a chip stream of samples derived from a received spread-spectrum...
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6836518 |
Synchronization control method for receiver apparatus of data transmission system utilizing orthogonal frequency division multiplex, and data transmission system
A data transmission system and method utilizing orthogonal frequency division multiplexing, wherein in a receiver apparatus of the data transmission system, synchronization is obtained by the...
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6834075 |
Method for improving multipath searcher speed
A multipath signal searcher ( 204 ) used in CDMA wireless communication systems is provided. Search paths ( 214 ) of the multipath signal searcher are grouped together and assigned by an offset...
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6831956 |
Wireless communications system with combining of multiple paths selected from sub-windows in response to the primary synchronization channel
A wireless receiver (UST). The receiver comprises at least one antenna (ATU) for receiving a plurality of frames (FR) in a form of a plurality of paths. Each of the plurality of frames comprises a...
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6829293 |
Method and apparatus for line probe signal processing
A system, method, and signal are disclosed for line probing. The invention provides an improved signal for line probing having desirable characteristics. In various embodiments the signal comprises...
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6826241 |
Apparatus and method for filtering maximum-length-code signals in a spread spectrum communication system
An apparatus ( 200 ) and method ( 700 ) for filtering maximum length code signals in a spread spectrum communication system including a plurality of base stations ( 102, 110, 118 ) and mobile...
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6823000 |
Method and apparatus for optimal dot product calculation
A dot product operator ( 30 ) uses adder trees ( 10 ) of L-1 adders and no multiplication circuits, where L is the length of the parallel dot product operator. Exclusive-or gates 12 provide the...
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6823175 |
Method for simultaneously measuring the propagating characteristics of a plurality of radioelectric channels
A process for simultaneously measuring the propagation characteristics of a plurality of radio-frequency channels. According to the invention, from several base stations are transmitted signals...
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6813320 |
Wireless telecommunications multi-carrier receiver architecture
A receiver ( 10 ) for a wireless telecommunications system that provides relatively wideband signal processing of received signals without increased signal distortion so that multiple received...
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6810093 |
Sequence detection
A system and method are disclosed for recovering a current data symbol that is part of a sequence of data symbols from a received signal. Recovering the current data symbol includes determining a...
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6807241 |
Method and apparatus for partial and course frequency offset estimation in a digital audio broadcasting (DAB) system
A method and apparatus are disclosed for frequency offset estimation in a hybrid in-band on-channel (HIBOC) digital audio broadcasting (DAB) system. The frequency offset estimation algorithm first...
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6804493 |
Mobile surface terminal communication system
A command and telemetry communication system includes a downlink subsystem having a spacecraft downlink transmitter communicating a quadrature component carrying a pilot code for coarse acquisition...
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6801569 |
Digital matched filter bank for othogonal signal set
A spread-spectrum communication system utilizes spreading code sequences, which can be expressed as a matrix. The matrix of code sequences has or can be transformed to have a certain orthogonal...
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6801589 |
Relative timing acquisition for a radio communications system
A method and apparatus are provided that allows a coarse timing approximation to be determined from analyzing only a portion of a received burst. The coarse timing can be refined by focusing on the...
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6795489 |
Acquisition of a gated pilot
Systems and techniques are disclosed wherein a gated pilot signal can be acquired by searching for a first gated pilot signal, deriving timing information from the search for the first gated pilot...
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6795490 |
Signal detection in a direct-sequence spread spectrum transmission system
A receiver ( 10 ) achieves more reliable detection of signals transmitted by Direct Sequence Spread Spectrum Transmission by correlating received signals with a separate of N symbol patterns via N...
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6792054 |
Method for reducing complex frequency down-conversion impairments
An improved receiver is provided having a voltage controlled amplifier for adjusting the gain of a first input signal, a comparator and integrator for controlling the voltage controlled amplifier...
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6788731 |
Flexible correlation and queueing in CDMA communication systems
A programmable correlator for a communication system includes an input queue coupled with an analog-to-digital converter (ADC). The input queue includes a random access memory (RAM) wherein sampled...
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6788736 |
Matched filter
A matched filter for inversely spreading a received signal using spreading signals in a spread spectrum communications receiver includes: a plurality of correlators for determining...
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