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| Number | Title | Issue Date |
| 5719899 | Multiple access digital transmission system and a radio base station and a receiver for use in such a system A multiple access digital transmission system including a transmitter for transmitting at least one modulated data stream, and at least one receiver for receiving, via a multipath transmission channel, a transmitted signal which includes the modulated dat... | 02/17/1998 |
| 5717717 | Device and method for adaptive narrow band interference suppression in multiple-access communications The present invention provides a device and method in multi-access communications system for reliably receiving burst transmissions from users in the presence of narrow band interference. The adaptive interference suppresser incorporates adaptive elements... | 02/10/1998 |
| 5710977 | Apparatus for measuring multipath propagation characteristics An apparatus for measuring multipath propagation characteristics receives a plurality of transmitted waves propagated over a plurality of different propagation paths and subjected to multipath fading over the propagation paths, and measures multipath prop... | 01/20/1998 |
| 5711009 | Method and apparatus for minimizing the effects of frequency selective fading on a PCM/FM data signal An apparatus for the error free transmission of PCM/FM telemetry data. The pparatus comprises a first mixer for receiving an RF signal which has a first frequency and which is the carrier for the PCM/FM telemetry data. A variable frequency oscillator provi... | 01/20/1998 |
| 5710995 | Adaptive antenna receiver An FM radio receiver, particularly for mobile receivers, reduces the effects of multipath distortion. It selects either an adaptive process (constant modulus algorithm or CMA) or a antenna diversity process depending on the circumstances of the instantane... | 01/20/1998 |
| 5680142 | Communication system and method utilizing an antenna having adaptive characteristics An apparatus, and an associated method, for facilitating reception and transmission of signals in a communication system, such as a cellular communication system. An antenna having an antenna pattern adaptively responsive to propagation characteristics ex... | 10/21/1997 |
| 5669063 | Method of establishing line of sight propagation A method of automatically determining the reliability of any LOS radio link given certain parameters. Specifically, this method allows a communications network operator to specify and determine the path reliability (PR) for each backbone and extension lin... | 09/16/1997 |
| 5659572 | Phased array spread spectrum system and method A phase array spread spectrum system for maximizing signal strength of a spread-spectrum signal with multipath through the use of receiving means, delaying means, combining means, despreading means, generating means, storing means and comparing means. The... | 08/19/1997 |
| 5654765 | Channel equalizer for digital television receiver having an initial coefficient storage unit A channel equalizer for a digital television receiver which filters an input signal to remove a noise component mixed therewith during transmission. The channel equalizer comprises an initial coefficient storage unit for outputting a predetermined coeffic... | 08/05/1997 |
| 5646964 | DS/CDMA receiver for high-speed fading environment A receiver is disclosed for a DS/CDMA communication system wherein a symbol is spread with a predetermined spread code to produce a DS/CDMA signal which is transmitted on a radio frequency carrier. The receiver includes an interference canceller for cance... | 07/08/1997 |
| 5630208 | Adaptive multipath equalization Method and apparatus for using a plurality of correlators to improve an estimate of direct signal arrival time by identifying features of a correlation function at and adjacent to the correlation peak. In a first embodiment, the errors in location of the ... | 05/13/1997 |
| 5625881 | Time and frequency diveristy in a radio system having intermittent operation receivers The invention provides a means by which a radio system in a multipath propagation environment may improve the probability of successful reception of a message by the application of diversity. It is applicable to such applications as paging, cordless telep... | 04/29/1997 |
| 5577265 | Antenna system for multipath diversity in an indoor microcellular communication system A system for mitigating the effect of fading in a digital communication system. Deep signal nulls occur when signals from multiple paths are precisely aligned in amplitude and phase canceling the signal at the receiving antenna and creating a fade. In an ... | 11/19/1996 |
| 5574984 | Method and apparatus for controlling a power level of a base station of a wireless communication system After setting a base station to a transmit power level (12) which provides a signal at a subscriber unit having a target quality level, a fading characteristic of a communication channel between the subscriber unit and a base site is measured (13). The fa... | 11/12/1996 |
| 5568202 | System for echo cancellation comprising an improved ghost cancellation reference signal A system for improved echo cancellation for use in particular in television receivers. The system features a superior ghost cancellation reference signal which exhibits improved performance in noisy environments and which exhibits the flat and wide bandwi... | 10/22/1996 |
| 5568522 | Correction of multipath distortion in wideband carrier signals The present invention provides a system for determining, and correcting for, channel-induced distortion in transmitted wideband carrier signals. During a synchronization, or sounding mode, known as the preamble mode, a wideband signal consisting of a numb... | 10/22/1996 |
| 5561850 | Method and arrangement for reducing fading between a base station and mobile units The invention relates to a method and an arrangement for improving the communication between a base station and a number of mobile units belonging to it in a microcell system. In greater detail, the invention has the aim of reducing the fading which is a ... | 10/01/1996 |
| 5557640 | Phase and amplitude equalization arrangement An equalisation arrangement compensates for multipath phase and amplitude distortion effects in a transmission channel by first measuring such distortion effects as they occur over time in a calibration phase, thereby obtaining phase and amplitude compens... | 09/17/1996 |
| 5550868 | π/4-DQPSK delay spread detection and compensation apparatus and method A π/4 delay spread detection and compensation arrangement effectively detects distortion due to multipath delay spread in a digital channel and compensates for this distortion with minimum circuit complexity. An improvement in the bit error rate performa... | 08/27/1996 |
| 5543803 | Fail safe receiver system A receiver system using antennas which may be effected by reflections or multipath propagation errors wherein the antennas are placed at spaced apart locations and produce outputs which differ due to the difference of locations and which may differ due to... | 08/06/1996 |
| 5542101 | Method and apparatus for receiving signals in a multi-path environment Signals from multiple signal paths are received using a multi-element antenna and a beam-forming network. Signals from each of the antenna elements are sampled to form a sample vector. Several sample vectors are used to form an auto-covariance matrix. A s... | 07/30/1996 |
| 5537683 | Radio paging system with antenna pattern exhibiting high diversity gain A radio paging system includes one or more transmitters (12) for sending radio signals to pagers (14) within a paging service area (10). Receivers (22) are located within the service area to receive low power transmissions from the pagers. These receivers... | 07/16/1996 |
| 5533063 | Method and apparatus for multipath channel shaping A method and apparatus for shaping the impulse response of a non-minimum phase communications channel, by reversing the CIR without enhancing the noise level using non-causal allpass filters is disclosed. Unstable allpass filters are implemented as stable... | 07/02/1996 |
| 5515365 | Method and apparatus for reducing interference in a time division duplex communication system A first transmitter (103) reduces an interference in a time division duplex (TDD) communication system (100). The first transmitter (103) alternates from a transmit state in which a first information signal (130) is transmitted to a standby state in which... | 05/07/1996 |
| 5513184 | Wireless communication system The present invention overcomes the prior art limitations by dividing a coverage area into very small regions or cells. The inventive system can be built as an adjunct to a wired telecommunication system such as a PBX. Advantageously, because of the relat... | 04/30/1996 |
| 5506861 | System and method for joint demodulation of CDMA signals Methods and systems for jointly demodulating CDMA signals are presented. The disclosed methods and systems provide, among other advantages, for accurate demodulation of such signals in multipath, time-dispersion environments. Single signal or multiple sig... | 04/09/1996 |
| 5487069 | Wireless LAN The present invention discloses a wireless LAN, a peer-to-peer wireless LAN, a wireless transceiver and a method of transmitting data, all of which are capable of operating at frequencies in excess of 10 GHz and in multipath transmission environments. Thi... | 01/23/1996 |
| 5465276 | Method of forming a channel estimate for a time-varying radio channel Radio signals are transmitted over a fading radio channel and are filtered and sampled in a receiver to obtain a digital signal. A channel equalizer has an equalizing filter in which a channel estimate is formed with the aid of a known synchronizing seque... | 11/07/1995 |
| 5465396 | In-band on-channel digital broadcasting A system for combining AM and FM transmissions. In-band, On-channel, FM Digital Audio Broadcast (IBOC FM-DAB) allows simultaneous transmission of DAB and FM over existing FM allocations without interfering with conventional analog FM signals. The utility ... | 11/07/1995 |
| 5448600 | Method for selecting propagation paths retained for receiving messages transmitted by CDMA radiocommunication Each path is identified by a delay which is applied to at least one spreading sequence for determining a correlation between the received signal ans said spreading sequence. For each selected delay, a reception energy, contained in the CDMA signal consist... | 09/05/1995 |
| 5446922 | Method and apparatus for switched diversity reception of a radio signal A method and apparatus in a data communication receiver (100) for diversity reception of a radio signal including a predictably repetitive, predetermined data bit pattern (304) comprises a processor (114) controlling (600) an antenna switch (106) to selec... | 08/29/1995 |
| 5442646 | Subcarrier communication system A communication system (100) is provided for transmitting data to mobile receivers utilizing a subcarrier within a commercial FM channel of a radio station (55). The data transmitted is first encoded in encoder (112), utilizing a forward error correction ... | 08/15/1995 |
| 5437055 | Antenna system for multipath diversity in an indoor microcellular communication system A system for mitigating the effect of fading in a digital communication system. Deep signal nulls occur when signals from multiple paths are precisely aligned in amplitude and phase canceling the signal at the receiving antenna and creating a fade. In an ... | 07/25/1995 |
| 5428834 | Method and circuit for processing and filtering signals A method for processing electrical signals includes the steps of: storing a plurality of first data signals, each representative of an instantaneous amplitude of a first input signal in a memory; selecting one of the first data signals in response to a se... | 06/27/1995 |
| 5408685 | Multipath detector using phase comparison of stereo pilot signal A frequency modulation (FM) stereo broadcast receiver detects the onset of multipath interference based on phase changes in the received stereo pilot signal. In a preferred embodiment, the phase of the received pilot signal is compared to the phase of a r... | 04/18/1995 |
| 5406629 | Apparatus and method for digitally processing signals in a radio frequency communication system A plurality of input signals are processed (75) using a Hadamard transform (52) to produce a combined Walsh covered parallel sequence which is sampled in time. The time samples are commutated (76) by a switch (53) or multiplexer to form a Walsh covered se... | 04/11/1995 |
| 5379046 | Interference wave canceller An interference wave removing apparatus removing interference wave between angle diversity branches is disclosed. This apparatus is suitable for microwave communication beyond line-of-sight. The apparatus comprises a first reception unit for main beam, a ... | 01/03/1995 |
| 5361276 | All digital maximum likelihood based spread spectrum receiver A spread spectrum receiver for use in spread spectrum communication systems is disclosed. The spread spectrum receiver of the present invention includes an analog-to-digital converter for receiving an analog spread spectrum signal, and for converting the ... | 11/01/1994 |
| 5349606 | Apparatus for multipath DSSS communications Circuit for recovery of a plurality of multipath direct sequence spread spectrum signal components received over a time span, wherein the multipath signal components are components of a signal generated from digital data comprised of data bits at a data b... | 09/20/1994 |
| 5347536 | Multipath noise reduction for spread spectrum signals The invention includes the concepts of early-prompt delay tracking, multipath correction of early-prompt delay tracking from correlation shape and carrier phase multipath correction. In early-prompt delay tracking, since multipath is always delayed with r... | 09/13/1994 |
