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7151948 |
Scheme for realizing path selection using optimum path selection threshold in radio communication
A receiver of a mobile station or a base station in radio communications is formed by a correlation unit for generating a delay profile for specifying paths by taking correlations by using replica...
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7151766 |
Radio communication apparatus used in CDMA communication system and power consumption control method therefor
A radio communication apparatus used in a CDMA communication system includes a plurality of delay profile circuits for generating delay profiles by calculating the correlations between a reception...
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7151792 |
Spread spectrum rake receiver
The present invention is provided with a path timing detection unit for detecting path timings of a multi-path; a de-spreading timing setting unit for setting the detected path timings as...
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7151793 |
Method for synchronizing a receiver, a positioning system, a receiver and an electronic device
A method for performing synchronization operations of a receiver to a received code-modulated spread spectrum signal whereby at least one reference code (r(x))is used. This reference code...
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7149266 |
Signal receiver and method of compensating frequency offset
An OFDM receiver includes an offset compensator ( 14 ) compensating for a frequency offset in a received OFDM signal. The offset compensator ( 14 ) includes a memory ( 51 ) storing two reference...
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7145938 |
Apparatus producing continuous stream of correlation values
An apparatus includes a plurality of received-signal registers which receive and store therein a plurality of respective received-signal sequences, a selector which selects one of the received...
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7142589 |
Global positioning system code phase detector with multipath compensation and method for reducing multipath components associated with a received signal
A method for compensating for multipath components in a received CDMA signal comprising a repetitive PRN code uses delay times in addition to the early, late and prompt delay times for determining...
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7142588 |
Multi-peak detector of mobile telecommunication system and method thereof
The present invention is related to a mobile telecommunication system, and more specifically, to a multi-peak detector of the mobile telecommunication system and a method thereof for high-speed...
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7142587 |
Received path timing detecting circuit at DS-CDMA system
A received path timing detecting circuit in a receiver used in a DS-CDMA system, which can detect received path timing in multi path propagation channels even under surroundings in which noise and...
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7142584 |
Synchronizing a bash station and a mobile station
A method for synchronizing a base station to a mobile station includes transmitting a signal sequence K(i) of length n from the base station to the mobile station. The signal sequence K(i) is...
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7142586 |
Robust delay estimation architecture
In a robust delay estimator system and method, an average PDP buffer serves as a source of reliable control information to other stages of the delay estimator. The PDP output from every path...
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7139302 |
Code division multiple access enhanced capacity system
A code division multiple access (CDMA) communication system using spread spectrum signaling over a communication bandwidth uses two different signal spectra generated using two different respective...
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7133439 |
Mobile communication terminal and method of communication
A mobile communication terminal includes a receiver ( 2 ) receiving a radio wave from base stations, a detector ( 5, 6, 7 ) detecting spread codes from the signal received by the receiver ( 2 ), a...
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7133435 |
Interference cancellation system and method
A method for reducing multiple access interference (MAI) in a code division multiple access (CDMA) spread spectrum receiver assigned a number of codes which also despreads the received signal with...
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7133440 |
Acquisition of a synchronous CDMA TDD QPSK waveform using variable thresholds for PN and burst synchronization
A method and system for open-loop acquisition of a pseudo-noise (PN) encoded QPSK burst signal is provided. The method includes the steps of determining a PN correlation accumulation (PNCA)...
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7133438 |
Acquisition method and apparatus for carrying out the method
Communications acquisition method for correlating an incoming binary-coded spread sequence having m bits and arriving at a frequency f with a locally generated spread sequence by phase-shifting a...
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7130333 |
Method and device for frame sync detection using channel combining and correlation
A method and device for frame sync detection using signal combining and correlation. The method comprises the steps of despreading PN coded signals to provide in-phase I 1 –I n , and quadrature...
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7130332 |
Pilot tracking for synchronization using correlation between digital signal and locally generated version of PN signal
A method of tracking a pilot channel to discipline an oscillator includes: downconverting the RF signal to a low frequency that is of the order of, but greater than the chip rate; converting the...
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7130326 |
Gated time division multiplexed spread spectrum correlator
A civil moderate (CM) code and a civil long (CL) code are time division multiplex (TDM) as a combined code having alternating code chips that spectrum spread a transmitted signal received by a...
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7126982 |
Apparatus for rapid PN code acquistion
An apparatus and method of determining a signal code. The method comprising steps of acquiring and correlating a signal with a first code sequence. In response to the correlation of the signal with...
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7124352 |
Tracking a code modulated signal
To reduce the complexity of the correlation in a correlation based tracking of a code modulated signal received at a receiver, received samples and available replica samples are aligned to each...
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7123647 |
Chip rate base band receiver processor which receives digital information containing symbol information
An X-Y, base-band receiver for code-division multiple accessing (“CDMA”) is used at both base station and mobile station. The signal transmitted from a transmitter carries serial information...
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7120192 |
Spectrum spread communication synchronization establishing apparatus using frequency offset and receiver with the same
A synchronization establishing apparatus in a spectrum spread communication system, includes a search section that calculates correlation values from a received spectrum spread signal, and...
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7120191 |
Method and apparatus for acquiring a ranging signal of a positioning system
A method and corresponding apparatus for accurately determining the offset of the carrier frequency of a received signal from a nominal frequency (the offset due to for example Doppler shifting),...
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7120186 |
Methods and apparatus for use in generating data sequences for spread spectrum communications
Methods and apparatus for use in generating data sequences for direct sequence spread spectrum (DSSS) communications are described. One exemplary method includes the steps of serially generating a...
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7113538 |
Time diversity searcher and scheduling method
Methods, searchers, base stations are provided which search for known codes contained in signals received over wireless channels, from mobile units for example. A coherent correlation is performed...
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7110432 |
Orthogonal chirp modulation in multipath environments
Methods and systems for communication systems are disclosed. Chirp signals generated according to a chirp rate and carrier frequency are used for communication. The chirp rate can be determined by...
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7110349 |
Adaptive communications methods for multiple user packet radio wireless networks
An exemplary wireless communication network that includes a base that communicates with remote units located in a cell of the network. A base concatenates information symbols with a preamble...
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7106786 |
Method for reducing auto-correlation or cross-correlation in weak signals
The present invention discloses methods, apparatuses, and systems for eliminating auto- and cross-correlation in weak signal CDMA systems, such as GPS systems. The invention uses parallel data...
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7106784 |
Universal rake receiver
A universal rake receiver architecture includes modular independent processing units that can be flexibly programmed to support different modes of operation. The processing units are capable of...
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7107056 |
Method and system for estimating movement speed of mobile unit
The present invention is related to a method for estimating a movement speed of a mobile unit in a mobile radio communication system. First, a signal from the mobile unit is received. Then, a first...
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7106783 |
Method and apparatus for searching multipaths of mobile communication system
The present invention discloses a method for searching multipaths of a mobile communication system, which includes the steps of: performing a coherent detection on a reversed I and Q channel...
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7103089 |
Multibit spread spectrum signaling
A method of transmitting and receiving a spread spectrum signal, wherein a product of a lower bit rate signal and a second PN-code equals the bit rate of a higher bit rate signal, and wherein a...
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7103061 |
Synchronization codeword for interference reduction in a CDMA system
The CDMA communication system according to the invention comprises at least one primary station ( 2 ) and a plurality of secondary stations ( 4 ). The primary station ( 2 ) and the secondary...
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7103070 |
Transmission system comprising a station of a first type and a station of a second type and synchronization method
This transmission system comprises a station of a first type and a plurality of stations of a second type which include a transmitting part having a transmit timing controller for transmitting data...
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7103095 |
Spread spectrum code correlator
Spread spectrum receiver with correlating coprocessor having common datapath for received signal correlations and code cross-correlations for efficient interference cancellation methods.
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7099381 |
De-spreading method and de-spreading apparatus
The present invention relates to a de-spreading method and a de-spreading apparatus, in which an correlation operation between input signals time-sequentially inputted and a predetermined code is...
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7099293 |
Buffer-less de-skewing for symbol combination in a CDMA demodulator
A demodulator in a wireless communication network for combining symbols without the need to store the received symbols in buffers for subsequent retrieval and accumulation. The demodulator includes...
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7099380 |
Apparatus for antenna diversity for wireless communication and method thereof
A method and an apparatus for selecting an antenna from an antenna diversity array in a wireless communication system are provided. The method includes the steps of modulating an incoming signal...
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7099377 |
Method and device for interference cancellation in a CDMA wireless communication system
The method of interference cancellation in a CDMA wireless communication system comprises receiving an incident digital signal containing a user signal transmitted on a CDMA user physical channel...
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7095990 |
Delay profile making method and delay profile making apparatus
A signal received under a multipath condition is buffered in storage memories 50 a and 50 b comprising two banks, and while overlap of write and read is allowed, the received data is supplied...
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7092433 |
Radiofrequency signal receiver with means for improving the reception dynamic of said signals
The receiver includes: a correlation stage (7) formed of several correlation channels (7′) for receiving intermediate signals (IF) in order to correlate them, in operating channel control loops,...
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7088766 |
Dynamic measurement of communication channel characteristics using direct sequence spread spectrum (DSSS) systems, methods and program products
A DSSS system determines transmission reliability of a communication channel in real time. A DSSS transmitter (f 0 =1/T) generates a Pseudo Noise (PN) code and modulates a carrier source [cos....
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7088951 |
Receiver, method thereof, program thereof, recording medium recording the program, and communication system
The system controller 12 attains program table data from a received electric wave upon turning on the power source. Program table data are rearranged for every ensemble and stored again. The user...
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7085313 |
Multiple channel joint decoding at mobile handset
A system and method suppresses the interference caused by non-orthogonal signals on multiple channels of the same receiver by applying an inverse of the correlation among the non-orthogonal signals...
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7085252 |
Cell search method, communication synchronization apparatus, portable terminal apparatus, and recording medium
A power threshold value ( 12 ) is set to be compared with a correlation power value detected by a correlator ( 2 ) and a power conversion section ( 4 ). As a result of comparison by a comparator (...
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7082286 |
Path searcher using reconfigurable correlator sets
A Node-B/base station has a path searcher and at least one antenna for receiving signals from users. The path searcher comprises a set of correlators. Each correlator correlates an inputted user...
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7079820 |
Combining signals exhibiting multiple types of diversity
Combining signals includes receiving first signals having a first frequency and second signals having a second frequency. A first weight reflecting a signal-to-noise ratio associated with a first...
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7079604 |
Ultrawide bandwidth system and method for fast synchronization using multiple detection arms
A system and method for fast synchronization of an incoming signal with a UWB receiver rapidly. The present invention synchronizes with a UWB receiver with an incoming signal. The present invention...
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7079587 |
Signal transmitter having voltage booster circuit and method of operating the same
In a radio signal transmitter, a microcomputer operates by receiving an output voltage of a battery to sequentially generate a voltage boosting control signal. This voltage boosting control signal...
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