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7616722 |
Method and circuitry for extracting clock in clock data recovery system
A method for extracting a clock in a clock data recovery system is provided. The method includes the following steps. First, a serial link transmission data is sampled for a plurality of times, and...
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7613264 |
Flexible sampling-rate encoder
A method for implementing a flexible sampling-rate encoder, comprising the steps of (A) sampling an input signal at a regular time-interval to produce sampled data, (B) generating a pseudo-random...
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7609751 |
Method and apparatus to initiate communications between an unknown node and an existing secure network
A first node initiating communications with a second node already in a secure network sends a discovery burst having a preamble portion and a payload portion. The preamble portion is sent at a...
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7602835 |
Multi-rate spread spectrum composite code
A correlator despreads a P/N long code constructed from two or more constituent codes A, B, C having N, M and L elements respectively. In a third stage, L filter taps decorrelate elements of the...
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7593453 |
Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system
A spread spectrum signal having an associated code is tracked at a receiver. A plurality of components of the spread spectrum signal are despread using the associated code. Each of the plurality of...
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7590195 |
Reduced-complexity multiple-input multiple-output (MIMO) channel detection via sequential Monte Carlo
A detection system and method are disclosed which uses sequential Monte Carlo techniques in a multiple-input multiple-output system. The detection system and method samples a first and second...
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7558356 |
Providing global positioning system (GPS) timing signals to remote cellular base stations
In a cellular network, a GPS receiver includes circuitry that modulates a global positioning system (GPS) timing pulse signal with a carrier signal and transmits the modulated signal to one or more...
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7555034 |
Apparatus and method for detecting timing error based on cyclic correlation
Provided is an apparatus and method for detecting timing errors based on characteristics of cyclic correlation. The apparatus and method can detect the timing errors of many users by using the...
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7545853 |
Method of acquiring a received spread spectrum signal
A method of acquiring a received spread spectrum signal, especially a GPS signal, is disclosed together with a spread spectrum signal receiver and a cellular telephone incorporating such a...
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7526010 |
Doped multi-rate spread spectrum composite code
A composite code is made for example by exclusive-OR'ing each real element of a first constituent code A with each element of a second constituent code B to obtain a basic composite code. To...
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7519099 |
Pseudorandom noise lock detector
A device for detecting data synchronization in data communications includes pseudorandom noise (PN) lock circuits ( 101, 113, 127 ). The PN lock circuits ( 101, 113, 127 ) receive an input data...
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7502428 |
Pseudo-noise encoded digital data clock recovery
An apparatus is disclosed. The apparatus includes a correlator that correlates a pseudo-noise sequence with a received clip stream in order to generate a correlated output. The apparatus further...
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7492810 |
Method and apparatus for segmented code correlation
A method and an apparatus is disclosed for efficient cross correlation of a plurality of signal vectors. Incoming data is partitioned into several segments and processed according to an algorithm...
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7489755 |
Method and apparatus for transmission and reception of data
Various embodiments are described to provide for the transmission and reception of data in an improved manner. Data transmission is improved by including in a transmitter a null generator ( 110 )...
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7486755 |
Method and system for undersampled symbol synchronization
Described is a system and method for providing a synchronization pattern in a communication system. The method includes generating a synchronization pattern with good randomness properties; packing...
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7480325 |
Signal receiver for integrating and combining integrations in alternating time segments for signal acquisition at low signal strength
A GPS receiver for integrating a GPS signal separately in a series of “A” type and “B” type time segments, the “A” segments alternating with the “B” time segments; combining the...
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7453920 |
Code synchronization in CDMA satellite wireless communications system using uplink channel detection
An uplink signal transmitted by a terminal is received by a satellite wireless communications system. The uplink signal includes a known information element, e.g., a reverse access channel (R-ACH)...
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7447254 |
Self-correlating pseudo-noise pairing
A method of transmitting communications codes is used in spread spectrum communications systems. The method includes transmitting a first pseudo-noise code, and transmitting a second pseudo-noise...
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7433438 |
Vestigial side band synchronization signal detection circuit
A vestigial side band (VSB) synchronization (sync) signal detection circuit and method of generating a VSB sync signal is described. The circuit may include means for generating a first control...
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7430263 |
System and method for timing correction for fast PN acquisition
A timing correction system for fast PN acquisition is provided. The system includes a signal sampler for testing any incoming signal and a real-time clocker coupled to the signal sampler. A...
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7430262 |
Frame synchronization method and system
A method and system for frame synchronization in a digital data transmission. A synchronization word is selected that is suitable for good correlation in a receiver detector. Either traffic bits or...
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7430196 |
Transmission systems
A receiver comprising a processor having an input to receive a sequence of transmission frames conforming to a transmission protocol to represent payload data,
a memory arranged to store and...
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7418248 |
Signal reception device, signal transmission device, radio communication system, and signal reception method
A signal reception device is disclosed that is able to improve interference cancellation capabilities even when signals having different center frequencies exist on the same frequency band. The...
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7412018 |
Rapid acquisition synchronization sequences for direct sequence spread spectrum systems using code time offsets
In a wireless communication system which includes a synchronization signal generator which generates a synchronization sequence, an RF transmitter which transmits the synchronization signal, and...
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7403583 |
System and method for predictive synchronization for locating interleaving frames and demodulation training sequences
A system and method for using Psuedo-Noise (PN) phase to determine frame start of a data frame is provided. The system and method includes at least two PN component codes, wherein the at least two...
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7386066 |
Method and device for detecting pulses of an incident pulse signal of the ultra wideband type
A detection device includes an antenna for receiving an incident signal, and for delivering a base signal. A comparator receives the base signal and provides an intermediate signal representative...
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7369600 |
Burst communications apparatus and method using tapped delay lines
A communications apparatus and method use tapped delay lines as multiplexers and demultiplexers. In one embodiment, a receiver ( 100 ) uses a tapped delay line ( 110 ) as a demultiplexer to acquire...
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7366090 |
Apparatus and method for generating a preamble sequence in an OFDM communication system
A method for generating a preamble sequence in an orthogonal frequency division multiplexing (OFDM) communication system having A subcarriers in a frequency domain. The method comprises generating...
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7342538 |
Asynchronous local position determination system and method
In a local positioning system, the land-based transmitters include free running oscillators or oscillators free of clock synchronization with any remote oscillator. A reference receiver receives...
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RE40111 |
Wireless alarm system
A remote power meter monitoring system using spread spectrum transmitters, fast frequency shift keying, spread spectrum receivers and a computer. The spread spectrum transmitter uses a chip code...
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7317776 |
Efficient pseudo-noise sequence generation for spread spectrum applications
The invention solves the problem of efficiently generating pseudo noise sequences with an arbitrary offset delay. Novel and improved architectures are used, based on the matrix-vector pseudo noise...
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7313173 |
Correlation detection method and apparatus, transmission diversity detection method and apparatus, each method and apparatus for detection within a small time unit
One code is generated by combining (including addition) 2 or more codes, correlation detection method which detects the correlation by multiplying such a generated code by the reception data. In...
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7305057 |
Multichannel filter-based handheld ultra wideband communications
A multichannel filter-based handheld UWB communication transceiver is presented for outdoor operations. Using eleven multichannels with multicarrier modulations, the invented handheld UWB...
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7298779 |
Fast code acquisition method based on signed-rank statistic
The present invention relates to the fast code acquisition methods based on signed-rank statistic. In more detail, it presents novel detectors required for PN (PN) code acquisition in DS/SS system....
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7251469 |
CDMA transmitting apparatus and CDMA transmitting method
A control section ( 110 ) recognizes the type of data included in a transmission signal and outputs a control signal (C 1 ) to an S/P conversion section ( 101 ) and a spreading control section (...
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7239813 |
Bit synchronization circuit and central terminal for PON systems
A bit synchronization circuit composed of a multiphase data sampling unit for converting each received burst data sets to multiphase data trains, a phase determination unit for generating a control...
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7230984 |
Methods and system for equalizing data in multicarrier receiver systems
A method for equalizing data and systems utilizing the method. The method of this invention for equalizing (by shortening the channel response) data includes minimizing a function of the data and a...
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7230910 |
Optimal channel sounding system
A channel sounding system employs orthogonal sequences to meet the Cramer-Rao bound in estimating the channel and achieves considerable simplification of the structure necessary to perform the...
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7227885 |
Correlation method in a communication system and apparatus
A receiver receives elements of a signal sequence. A state generator generates a sequence of addresses to translate between a pseudonoise sequence and a Walsh sequence. A storage medium, coupled to...
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7209495 |
Urgent messages and power-up in frequency hopping system for intemittent transmission
A wireless telemetry system includes many radio transmitters using frequency-hopping carriers for intermittently transmitting very short messages indicative of status of stimuli associated with the...
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7173983 |
COFDM demodulator with FFT analysis window displacement compensation
A COFDM demodulator including a fast Fourier transform circuit analyzing a received signal in a window corresponding to one symbol, each symbol carrying several phase and amplitude modulated...
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7116701 |
Base station using an antenna array for location determination
A base station comprises a plurality of antennas. Each of the antennas is separated by a known distance. A first spread spectrum signal is transmitted having a first code. Using the plurality of...
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7116698 |
Generator of repetitive sets of spread spectrum sequences
A generator of repetitive sets of spreading sequences comprising element ( 20 ), for counting and for forming an address and a table ( 30 ) containing L sets of S sequences, wherein the address...
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7110782 |
Cell search synchronization
Cell search synchronization in spread spectrum communications systems using primary and second synchronization codes with symbol partitioning for shorter coherent combinations (despreading) which...
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7099266 |
Orthogonal frequency division multiplexed signal transmitting apparatus, orthogonal frequency division multiplexed signal receiving apparatus, and orthogonal frequency division multiplexed signal transmitting/receiving system
An orthogonal frequency division multiplexed signal transmitting apparatus executes a time-division multiplexing process that inserts a reference signal at a predetermined interval based on...
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7092429 |
Multi-pass frequency hop-acquisition correlator
A multi-pass frequency hop timing acquisition correlator that produces a more accurate time estimate from the fast acquisition frequency hop signal is disclosed. The time estimate produced by the...
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7076212 |
Radio receiving system and synchronization detection method
A weight vector of a precedent frame calculated by a weight vector calculator ( 4 ) and stored in a memory ( 3 ) is applied to a signal received through a plurality of antennas (ANT 1 , . . . ANT n...
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7061966 |
Frame synchronization and scrambling code indentification in wireless communications systems and methods therefor
A mobile wireless communications device and methods therefore, including receiving a signal ( 710 ), storing a portion of the received signal ( 730 ), identifying all possible pilot signals by...
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7054350 |
Method and system for acquiring pseudo-noise (PN) decade-code phase
A method and system for synchronizing the PN phase of a pseudo-noise (PN) coded signal with a phase of a master PN decade-code is provided. The method includes the steps of associating the master...
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7054349 |
Method and device for decoding an incident pulse signal of the ultra wideband type, in particular for a wireless communication system
An incident pulse signal of the ultra wideband type conveys digital information that is coded using pulses having a known theoretical shape. A decoding device includes an input for receiving the...
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