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| Number | Title | Issue Date |
| 7672361 | System and method for despreading in a spread spectrum matched filter Implementation of an improved matched filter system for despreading a PN code from a spread spectrum signal utilizes a matched filter system that may be broadly conceptualized as a system that optimizes the number of multipliers and adders utilized by the system in ... | 03/02/2010 |
| 7664165 | Correlation apparatus based on symmetry of correlation coefficient and method thereof Provided is a correlation apparatus based on symmetry of a correlation coefficient that can reduce complexity of hardware by reducing the number of adders and multipliers. Accordingly, when values of a real number part and an imaginary number part are exchanged with... | 02/16/2010 |
| 7636384 | Method for detecting the orthogonal code CDMA signal The present invention discloses a method for detecting orthogonal code CDMA signal implemented mainly through the following steps: estimating the total power of interference to the multi-path signals; performing matched filtering on the multi-path signals and perfor... | 12/22/2009 |
| 7599426 | Use of adaptive filters in multiple access wireless systems employing predictable signals A code division multiple access (CDMA) radio system uses an adaptive filter in a receiver to mitigate multipath radio propagation and to filter out interfering signals. Characteristics of an initial stage of the filter preferably are determined by cross correlation ... | 10/06/2009 |
| 7545854 | Doppler corrected spread spectrum matched filter A method and apparatus for a spread spectrum matched filter with Doppler correction suitable for using in a radio frequency receiver. The system includes a signal sampler operable to receive signal data and a Doppler shift system operable to provide a Doppler shift ... | 06/09/2009 |
| 7539240 | Method and apparatus for parameter estimation in a generalized rake receiver Exemplary received signal processing may be based on maintaining a model of received signal impairment correlations, wherein each term of the model is updated periodically or as needed based on measuring impairments for a received signal of interest. An exemplary mo... | 05/26/2009 |
| 7539241 | Packet detector for a communication system Method and apparatus for packet detection is described. More particularly, a signal having sub-signals is received. The signal is quantized (“re-quantized”) to provide a quantized signal to processing units, where the quantized signal is a sequence of samples. A... | 05/26/2009 |
| 7508866 | Acquisition matched filter for W-CDMA systems providing frequency offset robustness A system and method for acquiring a transmitted spread-spectrum signal uses a matched filter configuration that is preferably employed as a Stage 2 filter in the second phase of an initial signal acquisition procedure performed in the receiver. In operation, ... | 03/24/2009 |
| 7505511 | Matched filter and spread spectrum receiver A matched filter for implementing the correlation of an input signal and a reference signal. The matched filter comprises N parallel M-sample long shift registers for receiving an equal number of input signals at the sampling frequency of the input signal, wherein N... | 03/17/2009 |
| 7489723 | System and method for adjusting acquisition phase A method (800) is provided of processing a wireless signal (105) at a receiving device (125). The method includes: receiving the wireless signal at the receiving device; performing an acquisition process (820, 830) to determine a phase es... | 02/10/2009 |
| 7447259 | System for direct acquisition of received signals Signal processing architectures for direct acquisition of spread spectrum signals using long codes. Techniques are described for achieving a high of parallelism, employing code matched filter banks and other hardware sharing. In one embodiment, upper and lower sideb... | 11/04/2008 |
| 7443942 | Receiving device and receiving method A receiver for CDMA enables a reduction in a circuit scale including a matched filter and lessening of loads stemming from despread processing. A speed conversion section 10 down-samples a received signal which has been over-sampled at a ratio of four times a chip r... | 10/28/2008 |
| 7440490 | Method and apparatus for multi-user detection using RSFQ successive interference cancellation in CDMA wireless systems A method and apparatus for using a multi-user detector for reducing multiple access interference (MAI) in a direct sequence CDMA wireless system such as W-CDMA. A superconducting rapid single flux quantum (RSFQ) RF digital receiver operating in combination with an R... | 10/21/2008 |
| 7433392 | Wireless communications device performing block equalization based upon prior, current and/or future autocorrelation matrix estimates and related methods A wireless communications device may include a wireless receiver for receiving signals comprising alternating known and unknown symbol portions, and a demodulator connected thereto. The demodulator may include a channel estimation module for generating respective ch... | 10/07/2008 |
| 7433430 | Wireless communications device providing enhanced block equalization and related methods A wireless communications device may include a wireless receiver receiving signals having alternating known and unknown symbol portions over a channel, and a demodulator systolic array. The demodulator systolic array may include a channel estimation module generatin... | 10/07/2008 |
| 7430233 | Spread-spectrum demodulator A spread-spectrum demodulator includes a spreading code generating section, correlation value computing section, data signal demodulating section, peak signal detecting section, and spreading code generation control section. The spreading code generating section gen... | 09/30/2008 |
| 7426234 | Synchronization signal detector and method A synchronization (sync) signal detector and associated method detect the occurrence of a known sync signal in a received signal. The known sync signal is generated and correlated with the received signal to generate a correlation waveform. A peak value of the corre... | 09/16/2008 |
| 7424050 | Matched filter circuit and correlation calculation method There are provided input route selecting means 711-713 and 723-725 for selecting, in accordance with the oversampling phase, input routes along which reception data and codes are to be input to individual shift register means, a plurality... | 09/09/2008 |
| 7424047 | Receiver based method for de-spreading of spread spectrum signal A spread spectrum receiver whose de-spreading process based on transformed spreading codes is provided. Instead of de-spreading with original spreading codes, this approach de-spreads received signal with the spreading codes transformed from the original codes in or... | 09/09/2008 |
| 7421261 | Blind detection The present invention relates to a blind detection of a received signal having at least one property, which initially is unknown to the receiver, however, limited to a finite set of alternatives ({p1, p2, . . . , pm}). According to t... | 09/02/2008 |
| 7418065 | Multicarrier receivers and methods for detecting cyclic prefixes having unknown lengths A multicarrier receiver sequentially correlates two training symbols to determine a length of a cyclic prefix associated with each of the training symbols. ... | 08/26/2008 |
| 7411993 | PN code generator, GOLD code generator, PN code despreader, method for generating PN code, method for generating GOLD code, method for despreading PN code and computer program Shift code patterns at four continuous phases obtained by dividing 15 shift code patterns given to the respective flip-flops of a linear feedback shift register of degree 4 into four parts are stored in a code memory (11). Besides, mask code patterns to shift... | 08/12/2008 |
| 7412014 | Timing-adjusting method and apparatus, and diversity receiving method and apparatus An A-D conversion unit performs analog-to-digital conversions on baseband signals. A correlation processing unit carries out a correlation processing. A power computing unit computes the power of correlation values. An inter-signal condition determining unit compare... | 08/12/2008 |
| 7397842 | Method and apparatus for combining weight computation in a DS-CDMA RAKE receiver A RAKE receiver circuit generates combining weights based on channel estimates and combining statistics that comprise channel coefficient statistics, noise statistics, and channel estimation error statistics. Together, these statistics incorporate the relationships ... | 07/08/2008 |
| 7394878 | Digital frequency determining apparatus and methods using matched filters Methods and apparatus for determining a dominant frequency contained in a multi-frequency analog signal. An apparatus includes a first matched filter pair and a second a second matched filter pair. Both the first matched filter pair and the second matched filter pai... | 07/01/2008 |
| 7388899 | Spreading code structure for ultra wide band communications The ultra wide band communication system of the present invention includes a transmitter (station) and a receiver (station). The transmitter and the receiver employ spreading code comprised of code groups, which respectively comprise varied, auto-correlated codes. C... | 06/17/2008 |
| 7386035 | Method of compensating for energy loss and eliminating inter-symbol interference and inter-chip interference and rake receiver for WLAN adopting the same Provided is a method of compensating for energy loss and eliminating inter-symbol interference (ISI) and inter-chip interference (ISI) in wireless signals, and a rake receiver for wireless LANs adopting the same. The rake receiver compensates for energy loss of a CC... | 06/10/2008 |
| 7382821 | Method and apparatus for configuring a RAKE receiver A searcher uses an input signal, and for example, a matched filter to generate a first set of candidate paths. A selector uses the input signal and the first set of candidate paths to generate a second set of paths. The second set of paths is used to configure the f... | 06/03/2008 |
| 7372888 | Method and apparatus for software reconfigurable communication transmission/reception and navigation signal reception The method and device performs spread spectrum based communication and/or navigation. Device embodiments may include a receiver having a plurality of programmable tracking units and a processor in communication with the receiver to control the device, such as reconf... | 05/13/2008 |
| 7369620 | Channel noise estimating method and apparatus applied to a multi-carrier system A channel noise estimating method and apparatus applied to a multi-carrier system are disclosed, where data symbols received by a receiving unit are applied to reconstruct the original transmitted data symbols. The reconstructing process is performed by either a sof... | 05/06/2008 |
| 7369606 | Phase error detector using I/Q interference cancellation A method is presented for estimating a phase error for first (rI) and second (rQ) orthogonal signal components spread respectively by different first cI and second cQ spreading codes. A cross-despread value IdQ and/or QdI ... | 05/06/2008 |
| 7366227 | Chip-to-symbol receiver despreader architectures and methods for despreading spread spectrum signals In a spread spectrum system, methods and despreader architectures for despreading the received spreaded codes with the use of a single correlator and a single correlation code is provided. Before despreading the incoming received spreaded codes, a single correlation... | 04/29/2008 |
| 7362719 | Method and apparatus for cross-talk cancellation in frequency division multiplexed transmission systems A method and apparatus are disclosed for canceling cross-talk in a frequency-division multiplexed communication system. The disclosed frequency-division multiplexed communication system employs multiple carriers having overlapping channels and provides an improved c... | 04/22/2008 |
| 7362257 | Wideband interference cancellation using DSP algorithms A method and system is provided for detecting and characterizing pulsed threat radar emitters through heavy in-band interference. System includes an advanced digital signal processing method provides spatial and temporal interference cancellation, super-resolution d... | 04/22/2008 |
| 7362790 | Apparatus and method for generating pseudo-replica signals in a CDMA communication system A noise reduction circuit for improving a signal-to-noise ratio of an input signal corresponding to a predetermined sequence of chips, each of the chips having a value corresponding to Logic 0 or Logic 1. The noise reduction circuit comprises a sampling circuit for ... | 04/22/2008 |
| 7362840 | Circuit and method for adjusting timing alignment using programmable codes A method is provided for adjusting timing alignment in which a receiver generates a plurality of imbalanced correction codes (1310), and square waves both having the same frequency. The receiver mixes the imbalanced correction codes with the square waves to c... | 04/22/2008 |
| 7362867 | Apparatus and method for generating scrambling code in UMTS mobile communication system A scrambling code generating apparatus of a downlink transmitter in a UMTS mobile communication system, which uses one primary scrambling code for separation of base stations and multiple secondary scrambling codes for channel separation. The apparatus includes a fi... | 04/22/2008 |
| 7362830 | Smart antenna system and method Disclosed is a smart antenna system and method. The present invention uses a gradient value closer to a true gradient in weight estimation using the correlation matrix having both of the Hermitian and Toeplitz properties, thereby shortening a convergence speed of th... | 04/22/2008 |
| 7359355 | Method for transferring intersystem connections To transfer intersystem connections, the quality of a transfer to a supplying base station in a first radiocommunication system is determined at a given moment by a subscriber station and compared to a threshold value. If the value falls below said threshold, a comp... | 04/15/2008 |
| 7359425 | Ultra-wideband transmitter and receiver, and ultra-wideband wireless communication method An ultra-wideband transmitter and receiver, and a ultra-wideband wireless communication method, which perform ultra-wideband wireless communication by a low-speed digital circuit having a low power consumption and controlling the effect of a multi-pass. In ultra-wid... | 04/15/2008 |