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| Number | Title | Issue Date |
| 6999533 | Demodulating encoded data The invention provides the ability to exploit redundancy characteristics of an equation set used to generate waveforms for wireless communication. In doing so, the invention can reduce the number of correlation values that need to be calculated in order to determine... | 02/14/2006 |
| 6996161 | Data communication in a wireless local area network using M-ary Code Keying A method and apparatus for data communication using signature sequences and spread spectrum techniques to reduce the effects of certain transmission impairments in a Wireless local area network (WLAN). The invention uses a number of correlators and M-ary Code Keying... | 02/07/2006 |
| 6996162 | Correlation using only selected chip position samples in a wireless communication system A method (70) of operating a wireless receiver (UST). The method receives a wireless communicated signal, wherein the signal comprises a first synchronization channel component. The method also correlates a synchronization channel value (PSC) to the signal to... | 02/07/2006 |
| 6993292 | Self-monitoring radio network A scheme of identifying nonfunctional two-way radios from among a known group of two-way radios expected to be operating within a region may include establishing a corresponding window of time for each of the two-way radios expected to be operating within the region... | 01/31/2006 |
| 6993065 | Multi-channel spread spectrum system A multi-channel spread-spectrum system separates a data stream, for example from a convolutional encoder and an interleaver, into sub-channel data-sequence signals. For each sub-channel data-sequence signal, m bits are translated to one code of a unique set of ortho... | 01/31/2006 |
| 6993345 | Positioning system of wireless terminal A wireless terminal has the enhanced performance in the attainability of successful search of GPS satellites based on the operation of a position data server. The server sets a GPS satellite search time longer than usual when station data pertinent to surrounding st... | 01/31/2006 |
| 6993458 | Method and apparatus for preprocessing technique for forecasting in capacity management, software rejuvenation and dynamic resource allocation applications A system and method preprocesses data, in a computer system where forecasting of computing resources is performed based on past and present observations of measurements related to the resources. The preprocessing includes decomposing the past and present observation... | 01/31/2006 |
| 6990140 | Signal receiver using coherent integration in interleaved time periods for signal acquisition at low signal strength A GPS receiver and method using alternating “A” and “B” integration time segments. The polarities of certain GPS data bits are known beforehand and their expected reception times are known. The GPS signal in 10 millisecond “A” time segments and “B” t... | 01/24/2006 |
| 6987966 | Adaptive radio transceiver with polyphase calibration An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 01/17/2006 |
| 6987799 | System and method for demodulating associated information channels in direct sequence spread spectrum communications A Direct Sequence Spread Spectrum (DSSS) receiver system (100) combines and orders the soft symbols from associated information channels. The system permits a QPSK channel to be demodulated as a pair of BPSK channels, and the soft symbols of the demodulated B... | 01/17/2006 |
| 6987746 | Pilot signals for synchronization and/or channel estimation The frame words of the preferred embodiment are especially suitable for frame synchronization and/or channel estimation. By adding the autocorrelation and cross-correlation functions of frame words, double maximum values equal in magnitude and opposite polarity at z... | 01/17/2006 |
| 6985699 | Efficient and optimal channel encoding and channel decoding in a multiple access communications system A method of channel encoding and channel decoding in a multiple access communication system wherein the channel decoding requirements increase linearly and not exponentially as the number of users increase. A channel encoder converts alphabetic symbols into a presel... | 01/10/2006 |
| 6983009 | Median weighted 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... | 01/03/2006 |
| 6980586 | Pseudo-noise encoded digital data clock recovery A pseudo-noise (PN) encoded digital data clock recovery circuit for recovering an original bit stream from a received chip stream includes a correlator, a phase controller, and a bit clock generator. The correlator correlates a pseudo-noise sequence with the receive... | 12/27/2005 |
| 6980539 | Mobile communication system in multi-carrier CDMA scheme using short code and long code In the mobile communication system in the multi-carrier CDMA scheme, data to be transmitted by the radio base station are doubly spread by using a long code that is unique to each radio base station and to be used in identifying each radio base station, in addition ... | 12/27/2005 |
| 6976034 | Method of transmitting data including a structured linear database A method, system and type of database for transmitting data is disclosed in which the data is organized into a structured linear database. The structured linear database includes a routing header portion, a file allocation table, a data portion and a tailbit portion... | 12/13/2005 |
| 6975665 | Low power, high resolution timing generator for ultra-wide bandwidth communication systems An ultra wide bandwidth communications system, method and computer program product including an ultra wide bandwidth timing generator. The timing generator includes a high frequency clock generation circuit having low phase noise; a low frequency control generation ... | 12/13/2005 |
| 6975673 | Narrow-band interference rejecting spread spectrum radio system and method A spread spectrum receiver and method having narrow-band interference rejection of narrow-band jamming signals using digital signal processing frequency domain techniques. The method performed in the receiver includes transforming the received signal to a frequency ... | 12/13/2005 |
| 6973120 | Receiver for CDMA system A receiver configured to receive signals corresponding to spread spectrum information symbol streams by pseudorandom binary sequences includes at least one channel (V1) with an adapted filter (20) and with a symbol clock signal (Hs) recovery circui... | 12/06/2005 |
| 6970497 | Intermittent calibration apparatus A base station receives a signal resulting from multiplexing a communication signal spread using a signal-specific spreading code and sent by mobile station apparatus and a calibration (CAL) signal spread using a signal-specific spreading code and sent for each unit... | 11/29/2005 |
| 6968021 | Synchronization method and apparatus for modems based on jointly iterative turbo demodulation and decoding A bandwidth efficient advanced modulation waveform modem using concatenated iterative turbo coding and continuous phase modulation is disclosed. A demodulator in the modem has a turbo decoder and a decision feedback carrier and time tracking algorithm to track a car... | 11/22/2005 |
| 6968197 | Apparatus and method for acquisition of communication quality In mobile communication systems employing the CDMA method, the communication quality is acquired from the CDMA pilot channel. A communication quality acquisition apparatus comprises a delay profile acquisition unit comprising a control unit, synchronization unit and... | 11/22/2005 |
| 6965634 | Non-stationary dither code generation and detection A detector receives a signal and detects from it a long code composed from shorter codes, where the shorter codes are dithered according to a non-repeating dither pattern. The received signal is correlated with a reference code, the correlation sums are ranked, and ... | 11/15/2005 |
| 6965630 | Mode Controller for signal acquisition and tracking in an ultra wideband communication system A system and method for controlling the mode of operation in a UWB receiver. In one variation, the system and method determines the mode of operation by reading a set number of samples of the signal, estimating mode parameters, calculating a mode probability, and th... | 11/15/2005 |
| 6965586 | Initial synchronization method in DS-CDMA inter-base station asynchronous cellular scheme An initial synchronization method in a DS-CDMA inter-base station asynchronous cellular scheme of transmitting a spreading code sequence, includes: a first stage that detects correlation power values between the common identification code and a received signal by us... | 11/15/2005 |
| 6965633 | Pilot synchronization channel structure for CDMA mobile communication system The invention discloses a pilot synchronization channel structure for mobile communication systems. The channel structure includes a pilot channel overlapping a synchronization channel (SCH), defined in the wideband code division multiple access (WCDMA) protocol. Ea... | 11/15/2005 |
| 6963602 | Digital correction method and system A method and system for providing a frequency correction for a spread spectrum communication receiver. In the method and system, a frequency offset is determined by processing successive samples of a despread data signal. A correction sequence is generated from this... | 11/08/2005 |
| 6963306 | Position location and data transmission using pseudo digital television transmitters A method, apparatus, and computer-readable media comprising generating a positioning signal comprising a first half-field and a second half-field; and transmitting the positioning signal; wherein each of the first and second half-fields comprises 313 segments; and w... | 11/08/2005 |
| 6961565 | Cell search method and apparatus for mobile station in mobile communication system The present invention reduces the time required for cell search and increase the accuracy of the cell search by determining, during selection of frame boundaries and a scramble code, whether or not the selection results are correct. A mobile station causes descrambl... | 11/01/2005 |
| 6961660 | Method and system for data detection in a global positioning system satellite receiver A data detection circuit within a global positioning system (GPS) satellite receiver operates to detect and decode data sent in a spread spectrum signal. The data detection circuit receives input from a radio receiver, the information containing data from a pluralit... | 11/01/2005 |
| 6959031 | Method and system for fast acquisition of pulsed signals A method and system for fast acquisition of pulsed radio signals where said signals comprised uniquely-spaced pulses or symbols. The receiver searches for and detects two ore more symbols, determines the interval or intervals between the symbols, and because the int... | 10/25/2005 |
| 6959049 | Multi-tap, digital-pulse-driven mixer A multi-tap, digital-pulse-driven mixer advantageously avoids local oscillator (11) leakage by shifting the local oscillator frequency (FLO) out of the received frequency band. Low noise figures are advantageously realized by the use of digital pul... | 10/25/2005 |
| 6959053 | Method and apparatus for searching for a pre-defined code in a bit stream A method of searching for a predefined code in a bit stream, the method comprising initiating a first search for correlation of the bit stream with a reference code applied to the bit stream at a first plurality of different times according to a first resolution to ... | 10/25/2005 |
| 6956897 | Reduced rank adaptive filter A reduced rank adaptive digital filtering method is described for a received signal consisting of a sequence of N×1 received vectors. Each received vector is formed from a group of N successive samples. D+1 basis vectors are generated where D is less than N and the... | 10/18/2005 |
| 6956815 | Method and apparatus using pseudo-inverses of linear transformations in multi-carrier modulation receivers and transceivers Many communications protocols involve a collection of communication channels collectively forming the dimensions of a finite dimensional vector space, of which at any point in time, only a subset of those channels or dimensions must be received. Messages on these ch... | 10/18/2005 |
| 6954488 | Method and apparatus for improved L2 performance in dual frequency semi-codeless GPS receivers This invention relates to improving the signal-to-noise ratio of semi-codeless tracking by presenting a method and apparatus which employs an optimal W-code timing pattern, and/or provides signal-to-noise gain by adding L1 and L2 W-code bit timing estimate signals b... | 10/11/2005 |
| 6952440 | Signal detector employing a Doppler phase correction system A spread spectrum detector employs a Doppler phase correction system that improves correlation of pseudo-noise (PN) codes to a received spread spectrum signal by combining phase shifts, in the time domain, to correlation values that compensate for the Doppler shift ... | 10/04/2005 |
| 6950456 | High-speed cell searching apparatus and method using DPSK-based distributed sample acquisition A next-generation mobile communication system is disclosed, including a high-speed cell searching method and apparatus using a distributed sample acquisition scheme (DSA) and a differentially-coherent phase shift keying (DPSK)-based DSA (hereinafter referred to as D... | 09/27/2005 |
| 6950458 | Method and apparatus for acquiring slot timing and frequency offset correction and storage medium storing control program therefor A method and apparatus for acquiring slot timing and frequency offset correction of a local oscillator, provided for use in a direct sequence spread spectrum receiver. The received signals in such a system comprise a plurality of sequential slots of data. Some of th... | 09/27/2005 |
| 6950485 | Precision timing generator apparatus and associated methods A precision timing generator includes a combiner that provides a timing signal by combining a coarse timing signal and a fine timing signal derived from a phase-shifted sinusoidal signal that has a desired phase shift. The coarse timing generator generates the coars... | 09/27/2005 |
