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| Number | Title | Issue Date |
| 6816717 | Estimation of signal to interference ratio in a mobile communication system Estimation of a signal to interference ratio in a cellular communications system is described wherein an estimate for interference is the weighted sum of individual interference estimates along each of a plurality of multi-paths, weighted according to estimates of t... | 11/09/2004 |
| 6804494 | System and method for the detection and compensation of radio signal time of arrival errors A system and method are disclosed by which the effects of time of arrival errors may be reduced. In a mobile unit, such as a CDMA device, a correlation pulse is generated when a transmitted code matches a stored reference code. In the absence of multipath effects, c... | 10/12/2004 |
| 6801782 | Method and apparatus for determining the position of a mobile communication device A position location communication system determines the position of a mobile master radio using a round-trip messaging scheme in which the time of arrive (TOA) of ranging signals is accurately determined to yield the range estimates required to calculate the positio... | 10/05/2004 |
| 6760386 | Receiver and method therefor Embodiments of the present invention relate generally to receivers. One embodiment relates to a digital FM receiver having multiple sensors (e.g. antennas). In one embodiment, the digital receiver includes a baseband unit having a channel processing unit. In one emb... | 07/06/2004 |
| 6731622 | Multipath propagation delay determining means using periodically inserted pilot symbols The invention relates to a multipath propagation delay determining means (STU, FIGS. 6, 7) for determining a power delay spectrum (DPS) of a CDMA signal transmission between a CDMA base station (BS) and a CDMA mobile station (MS) on a plurality of propagation... | 05/04/2004 |
| 6725027 | Multipath noise reducer, audio output circuit, and FM receiver A multipath noise reducer detects and removes the individual noise spikes occurring in an interval of multipath noise, thereby reducing the multipath noise with minimal distortion of the audio output signal. The multipath noise spikes are detected by comparing a rec... | 04/20/2004 |
| 6725016 | Method and apparatus for managing multipath signals for a receiver with multiple demodulators A method for managing multipath signals to be demodulated by a receiver with multiple demodulators. The method includes a series of steps, including receiving the multipath signals at a wireless communication receiver device, finding the multipath signals having suf... | 04/20/2004 |
| 6708020 | Calibration device A calibration device detects a delay or amplitude characteristic of a radio reception section. The characteristic is detected using a calibration signal of a band equal to or close to that used for radio communication. ... | 03/16/2004 |
| 6700929 | Method and apparatus for multipath parameter estimation in spread-spectrum communications systems A training method provides an advantageous technique for estimating secondary propagation path parameters based on learning propagation path characteristics for a selected number of secondary propagation path signals. In a multipath environment, a receive... | 03/02/2004 |
| 6683906 | Radio communication apparatus A radio communication apparatus subjects each signal which is received via a multi-path and demodulated, to a Hadamard transform at each of fingers, by use of an M-ary quadrature coding scheme, obtains correlation values of codes, combines correlation val... | 01/27/2004 |
| 6683569 | Non-linear technique for mitigating correlation timing errors due to multipath signals The present invention is a method of determining the time of arrival of an incident signal transmitted utilizing a code word that is interspersed with noise and diffracted and reflected signals of the incident signal. The incident, diffracted and reflecte... | 01/27/2004 |
| 6684061 | Systems and methods for measuring interference reciprocity between uplink and downlink directions in a wireless communications system Methods and systems for measuring interference reciprocity between uplink and downlink directions in a wireless communications system. Correlation data between uplink and downlink interference, e.g., bit error rate, during transmissions between wireless t... | 01/27/2004 |
| 6680699 | Signal reception method and device The invention concerns a method and a device for receiving a signal transmitted by a source with a plurality of antennas, in which a plurality of beam signals are obtained by weighting the signals received by the different antennas. The beam signals are c... | 01/20/2004 |
| 6665542 | System and method for cumulative clutter path loss A method and system of determining the cumulative clutter path loss between two points within a coverage area (30) of a telecommunications network. The coverage area of the network is divided into a geographical matrix of bins (31). For each bin in the ma... | 12/16/2003 |
| 6665526 | Multipath noise reducer, audio output circuit, and FM receiver A multipath noise reducer detects and removes the individual noise spikes occurring in an interval of multipath noise, thereby reducing the multipath noise with relatively little distortion of the output signal. The threshold signal used to detect multipa... | 12/16/2003 |
| 6628698 | CDMA reception apparatus and power control method therefor A CDMA reception apparatus has a plurality of fingers and performs RAKE reception by RAKE-combining outputs from the plurality of fingers. The apparatus includes a multi-path detecting section and delay profile generating section. The multi-path detecting... | 09/30/2003 |
| 6600926 | Channel simulator for mobile systems A device and a method at a mobile communication system which provide a flexible and realistic way of emulating the time dispersive qualities and the broadband frequency correlation qualities of a radio channel. The device includes two or more flexible del... | 07/29/2003 |
| 6584092 | Apparatus and method for OFDM communication Delay circuits 409 and 410 delay a digital baseband signal received by one symbol. Complex multiplier 411 performs a complex multiplication using the received digital baseband signal and the signal delayed by delay circuits 409 and 410. Of the multiplicat... | 06/24/2003 |
| 6526029 | Search scheme for receivers in mobile communication systems A receiver scans through two different search windows to detect a received signal: a first search window and a second search window. The timing of the second search window is adjusted after every processing cycle to follow the detected signal, while the t... | 02/25/2003 |
| 6522890 | Location and tracking system A method is disclosed for finding the position of a mobile radio-frequency transceiver in a communication system. A network of at least two unsynchronized base stations is arranged to transmit and receive signals to and from at least one mobile radio freq... | 02/18/2003 |
| 6515713 | Method and apparatus which compensates for channel distortion A method and apparatus for compensating for channel distortion is disclosed. In the present invention, equalization is performed in the treating sequence mode when the moving ghost does not exist in the channel and there is no possibility that the equaliz... | 02/04/2003 |
| 6509843 | Electronic toll collection system The present invention intends to provide an electronic toll collection system for suppressing multi-path. For this end, the electronic toll collection system automatically collects tolls by establishing wireless communication between a roadside antenna 23... | 01/21/2003 |
| 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 channel estimator is operatively coupled to the receiver for co... | 01/14/2003 |
| 6487417 | Method and system for characterizing propagation of radiofrequency signal A method, executed on a simulation system (20), characterizes propagation of a radiofrequency signal (56) in a three-dimensional environment (52). The method includes forming a database (42) of propagation paths (54) of the radiofrequency signal (56) tran... | 11/26/2002 |
| 6466166 | Multi-beam receiving apparatus In a multi-beam receiving apparatus, radio receiving sections receive radio signals through antenna elements. Correlators calculate code correlation values of desired wave signals contained in reception signals output from the radio receiving sections. Ea... | 10/15/2002 |
| 6453168 | Method and apparatus for determining the position of a mobile communication device using low accuracy clocks A spread spectrum position location communication system determines the position of a mobile master radio using a round-trip messaging scheme in which the time of arrive (TOA) of ranging messages is accurately determined to yield the range estimates requi... | 09/17/2002 |
| 6430399 | Multipath transmission for optimizing receiver reception The invention relates to a transmission method and a radio system comprising a transmitter and a receiver that communicate with each other by means of signals they have transmitted. The signals propagate along different paths from the transmitter to the r... | 08/06/2002 |
| 6421334 | Technique for time alignment of uplink CDMA signals The present invention relates to communication systems and in particular relates to the time alignment of uplink CDMA signals. A simple approach for improving the performance of received CDMA signals is discussed. This consists of aligning the timings of ... | 07/16/2002 |
| 6400779 | Estimating CIR using correlation with line removal A method of estimating the channel impulse response (CIR) of a communication system is disclosed. The method comprises providing a first estimation of the CIR by an impulse response calculation, using correlation of signals to determine tap weights for th... | 06/04/2002 |
| 6362782 | Multipath propagation detection and avoidance method and system Multipath propagation detection can be accomplished using first and second spaced antennas which receive a carrier signal from a moving radiation source and produce a carrier phase difference representative of the location of the source; a difference sign... | 03/26/2002 |
| 6339612 | Method and apparatus for joint detection of data in a direct sequence spread spectrum communications system Joint detection of data signals occurs in a code division, multiple access (CDMA) communication system as follows: A digital signal processor (315) first extracts a midamble portion of transmitted signal vectors and generates an estimate of the channel re... | 01/15/2002 |
| 6275705 | Location and tracking system The invention concerns a method of finding the position of a mobile radio-frequency transceiver in a communications system. A network of at least two unsynchronized base stations arranged to transmit/receive signals to at least one mobile-radio frequency ... | 08/14/2001 |
| 6272350 | Method for improved line of sight signal detection using time/frequency analysis The time-of-arrival of the line-of-sight component of a received, or incoming, signal is determined by performing a time/frequency analysis of the incoming signal. The term time/frequency analysis refers to an analysis of the frequency components (i.e. th... | 08/07/2001 |
| 6259894 | Method for improved line-of-sight signal detection using RF model parameters The invention provides a method for "adjusting" an identified or measured time-of-arrival of the first-arriving component of an incoming to more accurately reflect the time-of-arrival of the line-of-sight component of the incoming signal by reducing the s... | 07/10/2001 |
| 6252914 | Radio communication system A radio communication system for reducing deterioration of the transmission quality due to multipath fading while downsizing a terminal and reducing the power consumption. The propagation characteristic of a propagation path 3 is estimated by an automatic... | 06/26/2001 |
| 6219561 | Wireless communication network using time-varying vector channel equalization for adaptive spatial equalization An adaptive reception and transmission technique according to one embodiment of the invention offers the advantages of adaptive reception transmission using feedback without the associated mobile radio complexity increase and information capacity penalty.... | 04/17/2001 |
| 6219356 | Method for multipath resistant waveform coding for high speed wireless data transmission A method for multipath resistant waveform coding is provided. The method adds a chip extension to an optimally designed waveform set to compensate for an expected time shift in the radio channel during the transmission and demodulation of the transmitted ... | 04/17/2001 |
| 6219334 | Receiving apparatus for receiving orthogonal frequency division multiplexing signal and receiving method thereof A coherent detection type OFDM receiver is disclosed. The coherent detection type OFDM receiver demodulates a digital data sequence. The OFDM receiver obtains a channel frequency response with a frequency spectrum of a received signal and a frequency spec... | 04/17/2001 |
| 6216010 | Up-link power control for fixed wireless access This invention relates to radio communication networks and more particularly, to up-link power control for fixed wireless access communication networks. In accordance with one aspect of the invention there is provided a radio communications uplink power c... | 04/10/2001 |
| 6173166 | Detection and correction of multipath in an FM receiver An FM radio receiver predicts the onset of a multipath event based on a derivative of a noise detection signal and then further monitors the multipath event as it progresses. During multipath, an audio output pans between a normal signal path and a multip... | 01/09/2001 |
