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6873667 |
Spread spectrum time tracking
Time tracking units with decision statistics mitigating or correcting for influences from nearby interfering paths. Interference mitigation is accomplished by appropriately selecting the parameters...
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6873664 |
Method and apparatus for detecting an interleaved code
A receiver that receives a long pseudonoise (PN) code signal composed of two shorter codes interleaved with one another, includes a correlator unit that correlates the received signal with one or...
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6873649 |
Method and apparatus for detecting a stationary dither code
An apparatus and method of detecting a transmission code from a received signal, where the transmission code is composed of a plurality of dithered codes. The codes can be dithered either by...
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6868110 |
Multipath and tracking error reduction method for spread-spectrum receivers
A multipath mitigation method consists of locating a multipath-invariant (MPI) point of an ideal autocorrelation function and measuring the distance between the MPI point and DLL. The same MPI...
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6868115 |
All-lag spread-spectrum correlator
An all-lag correlator is provided that correlates a received spread-spectrum signal with a reference code and produces at each sampling instance N correlation lags corresponding to the correlation...
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6868108 |
Method and apparatus for generating and transmitting a stationary dither code
A generator generates a composite code from dithered copies of a reference code to form an optimal stationary dither code. The generator either dithers the length of the reference code to generate...
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6856643 |
Communication system and method for performing fast symbol estimation for multiple access disperse channels
A method for estimating symbol sequences from multiple transmitters which communicate with common receivers sharing the same medium is disclosed. This invention can be used in wireless...
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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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6850558 |
Spread spectrum receiver
The invention relates to a digital receiver part of a spread spectrum receiver, to which receiver part an intermediate-frequency signal (S in ) is applied, and from whose output a carrier and code...
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6850507 |
Apparatus and method for acquiring PN sequence in multicarrier CDMA mobile communication system
A PN sequence acquisition device for a multicarrier CDMA mobile communication system including M (where M is a natural number) despreaders, each for multiplying BS generated PN sequences included...
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6850557 |
Signal detector and method employing a coherent accumulation system to correlate non-uniform and disjoint sample segments
A signal detector employs a coherent accumulation system that coherently combines the correlation results derived from segments of samples of a received signal. The segments may have non-uniform...
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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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6839381 |
Method and apparatus for coherent detection in a telecommunications system
A method of channel estimation in a Code Division Multiple Access (CDMA) transmission system that incorporates Pilot Symbol Assisted Modulation (PSAM) using an iterative coherent detection method...
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6836505 |
Spreading code generation apparatus and CDMA receiver
The spreading code generation apparatus of the present invention temporarily stores a spreading code string generated from one spreading code generator in memory (shift register or RAM). Then,...
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6834074 |
Method of time tracking in a vector correlator based rake receiver
A mechanism for implementing time tracking and early/ontime/late correlation processing in a vector correlator has been implemented to accommodate processing of data when the earliest chips in a...
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6831942 |
MPSK spread spectrum communications receiver with carrier recovery and tracking using weighted correlation techniques
A multiple phase shift keying (MPSK) spread spectrum communications receiver uses weighted correlation techniques for carrier recovery and tracking. The receiver includes three subsystems: a...
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6832080 |
Apparatus for and method of adapting a radio receiver using control functions
An adaptive radio receiver utilizes control functions derived from received signals in an interference-limited environment to decide whether to implement conventional single-user demodulation or...
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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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6829291 |
Receiving apparatus and synchronization capturing method
A correlation calculating section 103 calculates correlation values from a baseband signal from a radio receiving section 102 . A delay profile generating section 105 generates a delay profile...
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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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6816543 |
Spread spectrum communication apparatus and synchronization acquisition method therein
A spread spectrum communications apparatus for synchronizing a received spread spectrum modulated signal and a de-spreading code, and its synchronization acquisition method are disclosed. In the...
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6816542 |
Direct sequence CDMA receiver having a delay profile producer with an interpolation function
A direct sequence CDMA receiver is disclosed that includes an interpolative delay profile production unit. An A/D converter receives signals that have been received by an antenna and converted to a...
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6810071 |
Code division multiple access (CDMA) code timing tracking apparatus
Disclosed is a CDMA (Code Division Multiple Access) code timing tracking apparatus capable of exact code timing synchronization without regard to signal gain change by normalizing signal gain to...
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6810075 |
CDMA receiver and CDMA receiving method
When the number of fingers assigned to a branch signal is smaller than the aimed number and there is a path to be added, the search is performed for an unused finger, firstly, and for one of...
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6807224 |
CDMA receiving apparatus and CDMA receiving method
A switch controlling section 204 controls a switching device 205 and a switching device 211 such that mode information, which shows that a current state of an apparatus is an initial...
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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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6804290 |
Method of acquiring signal code phases and geographic positioning receiver
A method of acquiring signal code phases includes selecting a correlation sum with a greatest magnitude from a set of correlation sums after a predetermined time has elapsed. A geographic...
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6804215 |
CDMA receiver
In a CDMA receiver which receives, as a reception signal ( 33 ), a signal given by subjecting a data signal comprising predetermined pattern data (PS) to spread modulation by the use of a spread...
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6801565 |
Multi-stage rake combining methods and apparatus
Information encoded in a spread spectrum signal transmitted in a communications medium is recovered. A composite signal including a spread spectrum signal is received from the communications...
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6801567 |
Frequency bin method of initial carrier frequency acquisition
A frequency bin method of carrier frequency acquisition uses a plurality of predetermined carrier frequency offset bins. A single bin is selected from among the plurality of bins. A local VCO is...
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6801568 |
Despreading apparatus and method for CDMA signal
An apparatus and method for despreading a CDMA signal, wherein the apparatus performs a predetermined operation on a received CDMA signal and first and second codes to extract a pilot symbol and a...
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6795771 |
Method and apparatus for correlating a satellite signal with a reference code
A method and apparatus for correlating a satellite signal with a reference code is described. In an example, samples of a satellite signal having a repeating code are received. At least one fast...
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6795487 |
Receiver
A positioning or timing receiver, for receiving pseudo-noise encoded signals includes mask mixers in the main signal paths, prior to accumulators. The mask mixers are fed with mask signals having a...
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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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6792035 |
Method and apparatus for reducing the effect of multipath propagation in a received signal
The invention relates to a method for reducing the effect of multipath propagation in a receiver ( 1 ) in which a code-modulated spread spectrum signal is received. In the method, at least one...
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6792037 |
Apparatus and method of searching for known sequences
Apparatus and method for correlating a received communication of a known sequence over a wireless channel through the use of a finite impulse response (FIR) filter having a small number of taps to...
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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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6785321 |
Apparatus and method for estimating the time of arrival of a spread spectrum signal in a wireless communication system
A threshold tracking loop (TTL) ( 400 ) for detecting the time of arrival of a spread spectrum wireless communication signal includes a pseudo-noise (PN) generator ( 440 ) for generating a receive...
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6782041 |
Radio receiver and method for identifying spreading codes
A grouping setting section 206 controls spreading code generation sections 207 to input a plurality of long codes into an adder 208 one by one, and thereby the plural long codes are grouped....
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6778593 |
Demodulator device and demodulation method
A demodulator device of the present invention receives a propagation signal including a plurality of channel signals multiplexed with each other, that is modulated by using an orthogonal code...
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6775319 |
Spread spectrum receiver architectures and methods therefor
Methods and architectures for code phase searching spread spectrum signals having a repeating sequence of bits. The signals are searched virtually in parallel by segmenting with a divider ( 314 )...
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6775318 |
Method and apparatus for code group identification and frame synchronization in DS/CDMA systems
The present invention provides an apparatus and method for code group identification and frame synchronization for cell searching used in wide-band DS-CDMA cellular systems. This method...
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6771622 |
Pilot-signal searching with decimation reordering
An example application of the invention is directed to a mobile receiver searching pilot signals in a CDMA-based radiotelephone communications system. The receiver processes received pilot signals...
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6765953 |
User terminal parallel searcher
The present invention is a method and apparatus for detecting the presence of or acquiring a signal in a data stream, where the signal has been spread using a pseudonoise sequence. The method...
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6763057 |
Vector modulation system and method for wideband impulse radio communications
An apparatus and method for communicating information using an ultra wideband impulse radio transmitter and receiver is disclosed. The method includes the steps of generating and transmitting a...
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6763058 |
Low signal to noise ratio acquisition and link characterization techniques for VSAT spread spectrum modems
A direct sequence spread spectrum (DS-SS) communications modem for low signal to noise ratio applications and secure communications systems ( 10 ). The modulator ( 22 ) implements a...
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6763056 |
Path timing detection circuit and detection method thereof
A path timing detecting circuit can save consumed current by omitting correlative arithmetic operations (cumulation) for unnecessarily long correlation lengths L when a propagation environment is...
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6760363 |
Digital correlation device and correlation method for telemetric systems
A correlation method and a digital correlation device allowing detection of the occurrence of a coded reference sequence including N code elements or chips in a sampled reception signal are...
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6760360 |
Device and method for filtering received signals for mobile telephone system
A received signal averaging apparatus which includes an average operating section which averages input signals and outputs a filtered data, a data encoding section which encodes data lower than a...
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