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| Number | Title | Issue Date |
| 6904102 | Method of, and receiver for, detecting the presence of data A method of, and a receiver for, detecting the presence of digitally modulated data signals in which the receiver is periodically energised to detect the presence of the signals. The received signals/noise are converted using a quadrature frequency translation stage... | 06/07/2005 |
| 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 the start time of at least one signaling sequence of at least terminal.... | 05/31/2005 |
| 6895039 | Method and apparatus for collision resolution in a delay-critical radio telecommunications system In a PRACH channel, colliding signals are resolved by use of a number of training-like symbols in the colliding data payloads. The signals are estimated by spatio temporal filters running a training-based or semi-blind algorithm, and a selection criterion is applied... | 05/17/2005 |
| 6891884 | Apparatus for detecting correlation, spectrum despread apparatus and receiver having the same, and method for detecting correlation An apparatus is provided for detecting a correlation of samples with a spread code comprising: an L-chip accumulator which inputs the samples to generate and output an intermediate correlation signal; M memories, each of which stores L×M samples of the intermediate... | 05/10/2005 |
| 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 plurality of symbols. A received transmitted frame is filtered using filt... | 05/10/2005 |
| 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 the invention including (1) an ON/OFF signaling scheme in which a pseu... | 04/05/2005 |
| 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 more reference codes corresponding to the two interleaved codes, respe... | 03/29/2005 |
| 6856797 | Programmable radio receiver bandpass filter for cordless/wireless systems A programmable band-pass filter in a radio-frequency receiver. The band-pass filter has a bandwidth substantially covering a channel bandwidth. Once the appropriate channel in use is determined, the frequency band of the band-width filter is set to correspond to it.... | 02/15/2005 |
| 6856646 | T-spaced equalization for 1xEV systems The present invention relates to systems and methods that facilitate compensating for intersymbol interference (e.g. due to non-nyquist filtering) in Code Division Multiple Access (CDMA) systems (e.g., IS 95 and IS2000 systems). The subject invention employs equaliz... | 02/15/2005 |
| 6850772 | Uni-modular adaptive CDMA receiver The invention concerns a method of receiving a signal transmitted by a transmitter (k) and arriving at an array of antennae (300) after propagating along a plurality of paths (i), comprising a filtering step (310k) decomposing each antenna s... | 02/01/2005 |
| 6847676 | All-lag spread-spectrum correlators with rotating references An all-lag rotating-reference correlator correlates a received spread-spectrum signal with a rotating reference code, and produces in each sampling instance N correlation lags corresponding to the correlation of the received signal with 0, 1, . . . , N−1 lags (or ... | 01/25/2005 |
| 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 signal and integrates a number of the most recent samples, to form a com... | 01/11/2005 |
| 6836507 | Symbol synchronizer for software defined communications system signal combiner A symbol synchronizer (100) is provided for a software-defined communications system (10). The symbol synchronizer (100), when integrated into either a pre- or post-detection diversity signal combiner (108, 208), enables highly accurate s... | 12/28/2004 |
| 6831944 | Reduced computation in joint detection A plurality of transmitted data signals are received at a receiver. The receiver measures a channel response associated with the transmitted data signals. A system response is determined. The system response is expanded to be piecewise orthogonal. The received data ... | 12/14/2004 |
| 6831929 | Multistage PN code aquisition circuit and method A circuit for detecting a serial signal comprises a first circuit (400) coupled to receive the serial signal (200) during a predetermined plurality of time periods of substantially equal duration. The first circuit is coupled to receive a first code ( | 12/14/2004 |
| 6825794 | Wireless communication system using surface acoustic wave (SAW) second harmonic techniques SAW devices such as interdigital transducers (IDTs) have been widely used in RADAR applications and as filters. An IDT produces a SAW when excited by a single electrical pulse and can be fabricated to embody a code, which code provides for a passive autocorrelation ... | 11/30/2004 |
| 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 function of multiplication by ±1, with the carry-in po... | 11/23/2004 |
| 6822692 | Digital filter Digital filter for filtering a digital input signal with a variable filter length (l), it being possible to switch over the filter length (l) of the digital filter (8) as a function of a variable input clock frequency (fin) of the digital input sig... | 11/23/2004 |
| 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 baseband signal and samples the signals at twice the chip rate. A ma... | 11/09/2004 |
| 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 synchronous mode, which is a power-on time, or a standby mode,... | 10/19/2004 |
| 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 relationship. In accord with the invention, a matched filter bank in a s... | 10/05/2004 |
| 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 reduce hardware requirement by as much as one-half that of convention... | 09/14/2004 |
| 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 cross-correlation functions of a received signal which has been sampled at a certain ... | 09/07/2004 |
| 6775260 | Space time transmit diversity for TDD/WCDMA systems A circuit is designed with a matched filter circuit including a plurality of fingers (700, 702, 704) coupled to receive a data symbol. Each finger corresponds to a respective path of the data symbol. Each finger produces a respective output signal. A pluralit... | 08/10/2004 |
| 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 characterizes each secondary synchronization code sequence (SSCS) with a corresp... | 08/10/2004 |
| 6771688 | Segmented architecture for multiple sequence detection and identification in fading channels Known sequences are detected and identified in a fast fading environment using a segmented correlator and FHT (Fast Hadamard Transform) architecture. The incoming sequence of samples or data is segmented into blocks. Each block is individually detected using a corre... | 08/03/2004 |
| 6771690 | Method and apparatus for providing blind adaptive estimation and reception A method is disclosed to minimize the mean-square-error of an estimate of an unknown parameter, such as a data symbol transmitted through a channel, such as a WCDMA channel. The method includes steps of (a) replacing a required multiplication of an input signal vect... | 08/03/2004 |
| 6760366 | Method and apparatus for pilot search using a matched filter The present invention includes a cellular pilot signal detector or searcher for use in a cellular mobile communications unit. The signal detector uses a matched filter to detect a pilot signal transmitted from a cellular base station. The matched filter includes a p... | 07/06/2004 |
| 6760321 | Method and apparatus for block-based chip timing estimation in a code division multiple access communication system A code division multiple access communication system receiver includes block-based chip timing estimation. A chip timing estimate is generated from samples of a received signal by performing an averaging operation over a designated block of chips in each of first an... | 07/06/2004 |
| 6754255 | Mobile terminal, a base station, and a synchronization control method In a mobile communication system, the tracking of synchronization is conducted in a stable state even in a multipath environment. A delay profile detector calculates a delay profile a(n) using a despread signal for each processing unit n. A delay profile averaging u... | 06/22/2004 |
| 6748007 | Method of processing a pulse response with an adaptive threshold and corresponding receiver A method of processing a pulse response with an adaptive threshold and corresponding receiver. According to the method, an adaptive threshold is calculated that is a function of a maximum reached by the pulse response, noise, and a coefficient adjustable between 0 a... | 06/08/2004 |
| 6735239 | Sequence generator A sequence generator for generating sequences of binary or discrete values may be flexibly adjusted to requirements. Shift register memory locations may be selected as feed-back locations for generating a feed-back signal. Further, shift register memory locations ma... | 05/11/2004 |
| 6724812 | Matching filter calculating correlation valve utilizing exclusive-or of two data and exclusive-or of two codes corresponding to the input data A matched filter has a circuit calculating an exclusive-OR of two input data, a circuit calculating an exclusive-OR of two codes corresponding to the two input data, respectively, and a correlation processor. The correlation processor, using the exclusive-OR of the ... | 04/20/2004 |
| 6721301 | Centroid tracking for spread-spectrum communications An improvement for a method and system for tracking a spreading code, used in a code division multiple access (CDMA) system. An input signal has spread-spectrum modulation. The spreading code embedded in the spread-spectrum modulation has a plurality of chips. The i... | 04/13/2004 |
| 6714586 | Sliding matched filter with flexible hardware complexity Multi-path effects are common in mobile communications. When coupled with spread-spectrum signals utilizing spreading code sequences, detection of more than one multi-path signal becomes a necessity in order to output a clean signal with little loss. In accord with ... | 03/30/2004 |
| 6707844 | Synchronous circuit and receiver There is disclosed a synchronous circuit and a receiver in which a long code for use in communication can be determined in a short time, and circuit scale can be reduced. Upon receiving input of a data stop signal from a control unit, a matched filter continues to h... | 03/16/2004 |
| 6704322 | Smart different prime code multiplexing system A smart different prime code multiplexing system. Using the characteristic that two different prime codes do not interfere with each other, these two prime codes are combined to replace the conventional asynchronous division multiple access. Without affec... | 03/09/2004 |
| 6693890 | Fast acquisition module for a code division multiple access (CDMA) wireless local loop (WLL) system An acquisition module for acquiring signal timing in a CDMA system has a register for storing and organizing synchronization code, at least 4 match filters for match filtering between I/Q samples and the corresponding synchronization code, at least 4 abso... | 02/17/2004 |
| 6693917 | Digital subchannel transceiver for transmitting data A system for transmitting subchannel data over the same media as high speed data, especially DC balanced high speed data. A digital transmitter receives subchannel data and modulates it onto a subchannel carrier as the host signal in the preferred embodim... | 02/17/2004 |
| 6690715 | Rake receiver with embedded decision feedback equalizer The performance of a RAKE receiver for indoor multipath WLAN applications on direct sequence spread spectrum signals having relatively short codeword lengths is enhanced by embedding a decision feedback equalizer structure in the signal processing path th... | 02/10/2004 |
