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6549564 |
Random access in a mobile telecommunications system
For one embodiment, a Random Access Channel (RACH) preamble modulation method and apparatus are disclosed in which the real and imaginary components of a complex RACH preamble are filtered in...
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6549589 |
Digital audio broadcasting receiver
A DAB (Digital Audio Broadcasting) receiver includes a delay circuit for delaying a received DAB signal by a prescribed period, a correlation circuit for taking correlation between a delayed output...
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6546062 |
Wireless network
The invention relates to a wireless network which includes at least one base station ( 1 to 3 ) and a plurality of associated terminals ( 4 to 14 ) for the exchange of useful data and control...
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6539069 |
Dynamic filtering of pilot energy samples in a wireless communication system
A method and apparatus for dynamically varying the response of a digital filter in a pilot signal detection circuit in response to the number of pilots that are scheduled to be searched. The...
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6539048 |
Ring matched filter for synchronizing to a spreading code
A mobile station is provided for receiving a spread spectrum, code division transmission from at least one transmitter, such as a base station. The mobile station contains a receiver for outputting...
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6535548 |
Mobile wireless communication devices for receiving spread spectrum signals and methods therefor
A mobile wireless communication device for extracting time from a spread spectrum signal including a repeating short chip code and a repeating long chip code, a ratio of the long and short chip is...
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6532255 |
Method and arrangement for minimizing the autocorrelation error in the demodulation of a spread-spectrum signal subject to multipath propagation
A method is disclosed relating to an arrangement for minimizing the autocorrelation error in the demodulation of a spread-spectrum signal subject to multipath propagation. The received signal is...
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6529546 |
Acquisition of a spread-spectrum signal using counters
An improvement for obtaining synchronization to a chip-sequence signal. The chip-sequence signal has a plurality of chips, and is embedded in a spread-spectrum signal. A set of M shift registers...
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6529783 |
Process for estimating a parasite phase shift during reception of a multi-carrier signal and the corresponding receiver
A method for estimating an interference phase shift when receiving a multicarrier signal formed of a time series of symbols modulating a plurality of carrier frequencies, at least some of the...
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6522706 |
Delay spread estimation for multipath fading channels
An efficient method of accurately estimating delay spread in multi-path transmission applications is based on quantifying the effect of the actual delay spread on the shape of the correlation...
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6522866 |
Alternative frequency service verification
An alternative frequency of e. g. a digital shortwave signal like a DRM signal can easily and satisfactorily be checked whether or not the same service is transmitted before a fast seamless...
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6519300 |
System and method for automatic frequency correction in a pilot symbol assisted demodulator
A method for selecting a frequency offset for automatic frequency correction in a pilot symbol assisted demodulation system comprises the steps of receiving a signal comprising a plurality of...
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6516020 |
Correlator and despreading code switching method
Despreading codes are switched at effective timings to perform despreading calculations by providing a rate difference between the first clock signal to input a spread signal to be subjected to the...
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6512785 |
Matched filter bank
A matched filter bank including a plurality of matched filters and a sampling and holding units commonly used by the total matched filters. Therefore, the circuit size is diminished. An inverting...
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6510186 |
Signal time of arrival estimation method and system
A time delay estimation method including the steps of first, estimating a channel response from a received signal, and second, determining a time delay estimate by correlating the estimated channel...
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6507602 |
Smoothing receiver channel estimates using spectral estimation
A receiving apparatus comprises a receiver receiving signals via multiple propagation paths having different propagation delays and converting the signals to digital samples for processing. A...
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6504867 |
Digital matched filtering for signal estimation in a digital receiver
A digital radio tuner signal estimator receives a digitized in-phase (I) data signal and a digitized quadrature (Q) data signal and provides an estimated amplitude gain signal and an estimated...
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6504883 |
Synchronous detector
A synchronous detector used in a code division multiple access (CDMA) communication receiver comprises a correlator and a pre-synchronous decision circuit. The correlator calculates a plurality of...
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6493405 |
Correlator having enhanced memory for reference and input data
A correlator includes a circuit for serially receiving in phase (I) and quadrature (Q) signal data along parallel I and Q signal channels and converting the data to blocks of n bit parallel I and n...
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6490316 |
Correlation detection apparatus and CDMA receiving apparatus
An apparatus for obtaining correlation by despreading a spread symbol with a spreading code is provided with a symbol storage section for storing symbol and a plurality of correlation calculators...
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6487252 |
Wireless communication system and method for synchronization
An orthogonal frequency division multiplexed wideband communication system provides improved time and frequency synchronization by inserting an unevenly spaced pilot sequence within the...
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6487260 |
Method and apparatus for efficient correlation detection
A full serial implementation of a M-level correlation based demodulator ( 100 ) includes a two's complement, pass-through, zero-out complex conjugate multiplier element ( 102 ), a boxcar filter (...
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6483882 |
EFM demodulation circuit and method
A method for EFM demodulation is provided which includes a fuzzy logic-based ROM look-up conversion table capable of correcting data errors caused by invalid EFM bit patterns. The ROM look-up table...
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6483821 |
CDMA mobile communications system and method with improved channel estimation and pilot symbol transmission
The present invention is an improved system and method for transmitting and receiving digital information over mobile communication channels. The present invention includes an enhanced channel...
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6480532 |
Echo cancellation for an ADSL modem
An echo cancellation functionality taps a digital transmit signal from a transmit channel for processing through an adaptive filter of an echo channel to generate an echo cancellation signal. The...
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6480556 |
Rate detection apparatus and method for variable rate speech encoding
A method of detecting the data rate of a received digital signal is provided. The method generally includes the steps of decoding a received signal at each of a plurality of possible rates to...
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6480529 |
Programmable matched filter searcher for multiple pilot searching
A novel and improved method and apparatus for searching is described. This searcher combines the ability to search multiple offsets of single pilots, such as those found in the IS-95 system, with...
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6473451 |
Signal to interference power ratio measuring apparatus and signal to interference power ratio measuring method as well as transmission power controlling method under CDMA communication system
The invention provides a technique for measurement of a signal to interference power ratio wherein an SIR can be measured with a higher degree of accuracy without being influenced by a fast fading...
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6473473 |
Method for estimating connection quality, diversity combination method, and receiver
The invention relates to a method for estimating the quality of a connection and a diversity combination method in a digital radio system in which the signals transmitted are in burst form, the...
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6463091 |
Spread spectrum receiver using a pseudo-random noise code for ranging applications in a way that reduces errors when a multipath signal is present
A receiver of a radio frequency signal having a pseudo-random noise (PRN) code, and techniques of processing such a signal that are especially adapted for ranging applications. A signal...
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6463107 |
Methods and apparatuses for synchronization and modulation type detection
In a communication system including a transmitter and a receiver, the receiver is synchronized with the transmitter, and a modulation type in a signal transmitted by the transmitter and received by...
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6456647 |
Two step signal recovery scheme for a receiver
According to an embodiment of the invention, a DS-CDMA receiver receives an input signal which comprises a plurality of received signals that are received over a corresponding plurality of...
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6456646 |
Methods and systems for detecting codewords with intersymbol interference and imperfect timing
Methods and systems are provided whereby correlations between a received signal sample set and a plurality of potential codeword data set are determined and a potential codeword with the highest...
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6452986 |
Detector tolerant of frequency misalignment
A method to separate data transmitted in parallel at arbitrary frequencies within a channel includes: separating a signal from one channel into a plurality of bins representing sub-channels, each...
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6445728 |
Method of establishing search window size for a mobile station in a cellular system
A method of establishing a search window size for a mobile station in a cellular system is disclosed. For the mobile station searching for a pilot signal of base transceiver station (BTS), the...
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6445756 |
Peak detecting circuit for detecting a peak of a time discrete signal by an approximate function
A peak detecting circuit capable of accurately detecting a peak of a time discrete signal without increasing a circuit scale. The peak detecting circuit detects a peak of a waveform of a time...
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6442189 |
Binary code phase offset calculation method and a binary code phase synchronization method by using the phase offset
The present invention is to provide a phase offset calculation method of binary code being used in a mobile communication system, a binary code error detection method for detecting errors occurred...
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6442220 |
Method for efficient synchronization in a communication system
A method for discrimination of repetitive sequences in a wireless communication system in which the repetitive sequences have the same repetition length. For the discrimination the repetitive...
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6438187 |
Phase processor for data pattern correlator
A status phase processor for a data pattern recognizer or correlator provides an optimized synchronization signal. The synchronization signal can be utilized to adjust the data sampling clock. The...
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6438183 |
Digital audio broadcast receiver and tuning method thereof
A digital audio broadcast receiver is tuned by performing a sliding correlation on data demodulated from a phase reference symbol, correlating the demodulated data with known data at negative...
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6438182 |
Correlator with serial-parallel partition
A correlator and method of correlating include a circuit that serially receives in phase (I) and quadrature (Q) signal data along parallel I and Q signal channels at one input bit time periods and...
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6434361 |
Synchronization burst processor for a processing satellite
A synchronization burst processor ( 56 ) used in a processing satellite ( 12 ) in a satellite based communications system ( 10 ) is provided with a sync burst memory ( 72 ), a first double...
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6430237 |
Method for accurate signal-to-interference measurement for wireless communication receivers
An interference measurement technique in for example a wireless receiver uses a received, unprocessed signal and correlates it with a signal reconstructed from detected information, then compares a...
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6426982 |
Low complexity multiple bits matched filter
Method and system for efficiently and quickly forming a sequence of convolution values from an over-sampled digital signal sequence. Convolution value differences are computable from a set of...
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6421401 |
Method and apparatus for achieving and maintaining symbol synchronization particularly in an OFDM system
To achieve and maintain symbol synchronization in a receiver a correlation ( 302 ) between an undelayed sequence of samples representing the received signal and a delayed sequence of samples...
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6421000 |
GPS multipath mitigation using a multi-element antenna array
A method and apparatus for mitigating multipath signal distortion using a multi-element antenna array is provided. The multi-element antenna array is used to discriminate between the desired signal...
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6421371 |
Modulation sequence synchronization methods and apparatus employing partial sequence correlation
A receiver in a communications system is operated by receiving a radio communications signal transmitted by a station of the communications system and generating a correlation output representing a...
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6421372 |
Sequential-acquisition, multi-band, multi-channel, matched filter
A parallel digital matched filter is constructed which performs numerous simultaneous correlations of a received spread spectrum signal against various replica offsets of its spreading sequence....
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6414987 |
Code multipath estimation for weighted or modified tracking
The apparatus and method for estimation and minimization of the residual multipath error signal are disclosed. The reduction of the multipath error signal is achieved by using the weighted or...
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6411664 |
Correlation detecting apparatus, its detecting method and communication apparatus and its communication method
A correlation detecting apparatus is capable of securely detecting a M sequence code forming a reference for timing even when a plurality of signals with different amplitudes are time division...
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