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| Number | Title | Issue Date |
| 6166690 | Adaptive nulling methods for GPS reception in multiple-interference environments Methods are disclosed for receiving GPS signals in the presence of multiple interference signals. The methods feature the orthogonal projection of sub-optimal weight vectors onto sets of orthonormal basis vectors. They facilitate the use of single-port re... | 12/26/2000 |
| 6133963 | System for echo cancellation comprising an improved ghost cancellation reference signal An apparatus for receiving a television signal containing a ghost cancellation reference signal, and for using the reference signal to process the television signal so as to substantially eliminate path induced distortion.... | 10/17/2000 |
| 6115427 | Method and apparatus for data transmission using multiple transmit antennas A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas is disclosed. A set of bits of a digital signal are used to generate a codeword. Codewords are provided according to a channel code. Delay... | 09/05/2000 |
| 6101399 | Adaptive beam forming for transmitter operation in a wireless communication system A method for forming an adaptive phased array transmission beam pattern at a base station without any knowledge of array geometry or mobile feedback is described. The approach is immune to the problems which plague methods which attempt to identify receiv... | 08/08/2000 |
| 6084862 | Time dispersion measurement in radio communications systems Time dispersion of a signal that has been received from a channel is measured by utilizing metrics to determine the energy inside an equalizer window and outside of the equalizer window. In one embodiment, the estimate of the energy outside the window is ... | 07/04/2000 |
| 6078788 | Method and receiver device for reconstructing signals distorted by multi-directional diffusion Signals distorted by multipath propagation are reconstructed. In a first step, the incidence direction of the wavefronts, that is to say of the respective d dominant signal components, is estimated and the signal components are reconstructed. The wavefron... | 06/20/2000 |
| 6055277 | Communication system for broadcasting to mobile users A communication system (10) implemented to be specifically matched to the time and spatially dependent statistics of a transmission channel (36). The communication system (10) is used for broadcasting over the channel (36) to users in a coverage region (1... | 04/25/2000 |
| 6047019 | Receiver for spectrum spread communication system A receiver for a spectrum spread communication system capable of eliminating a deterioration in receive quality due to fading by multipass. A signal of which a spectrum is spread by a direct spread modulation system is transmitted from a transmit side uni... | 04/04/2000 |
| 6032048 | Method and apparatus for compensating for click noise in an FM receiver These and other objects of the present invention are achieved using an Adaptive Multi-Path Filter (AMPF) which eliminates audibly objectionable click noise generated at the output of an FM discriminator to prevent audible distortion or other corruption of... | 02/29/2000 |
| 6032052 | Apparatus and method for data transmission Radio communication apparatus for transmitting control data, comprising output power amplifying means responsive to a control signal from an output power control means for varying a predetermined output power level from the output power amplifying means i... | 02/29/2000 |
| 6018651 | Radio subscriber unit having a switched antenna diversity apparatus and method therefor A radio subscriber unit (102) comprises a controller (108) and a switched antenna diversity receiver apparatus (106) including a first antenna (114), a second antenna (116) and a receiver (126). The first antenna (114) is adapted to receive a first repres... | 01/25/2000 |
| 6018643 | Apparatus and method for adaptively forming an antenna beam pattern in a wireless communication system A system for wireless communication between a base station 30 and one or more remote stations 32 and 34 wherein the beam pattern of the receiving antenna 50-52 can be adaptively formed to track a desired signal. A series of weights is applied, one to each... | 01/25/2000 |
| 6006072 | Method and apparatus for interference cancellation In first radio station and a second radio station constituting a radio transmission system using spatial duplex diversity, interference signals are cancelled by a power inversion adaptive array (PIAA). One branch of the transmission side is multiplied by ... | 12/21/1999 |
| 6006110 | 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.... | 12/21/1999 |
| 5991345 | Method and apparatus for diversity enhancement using pseudo-multipath signals Method and apparatus for enhancing diversity in spread spectrum type communication systems by creating pseudo-multipath conditions or links for certain communication signals. The invention provides alternative or additional signal paths, for signals being... | 11/23/1999 |
| 5963867 | Graphic tools for interactively planning a wireless network A method and apparatus for providing network planning information in an interactive manner is described. A user selects a planning tool and inputs a selection point. If a line of sight cursor tool has been selected, a set of points on a display are set in... | 10/05/1999 |
| 5956624 | Method and system for simultaneously broadcasting and receiving digital and analog signals Apparatus and method for transmitting a digitized wideband signal robust to multipath degradation and intersymbol interference within a predetermined broadcast band. A basis set of wideband mutually orthogonal pseudorandom basis signal waveforms of substa... | 09/21/1999 |
| 5950124 | Cellular communication system with dynamically modified data transmission parameters An apparatus and process for improving the performance of a cellular communication system using direct sequence spread spectrum techniques. The apparatus and process enable dynamic modification of communication system parameters including PN code length, ... | 09/07/1999 |
| 5936578 | Multipoint-to-point wireless system using directional antennas A multipoint-to-point wireless System using directional antennas in an indoor environment. Optical pulses in an asynchronous transfer mode network may be converted into radio pulses, which are transmitted by a radio transmitter to a radio receiver, and th... | 08/10/1999 |
| 5926470 | Method and apparatus for providing diversity in hard handoff for a CDMA system In a communications network, a network user communicates using a remote unit with another user via at least one base station. The communications network has a first base station having a first coverage area and a second base station having a second covera... | 07/20/1999 |
| 5926502 | Phased array spread spectrum system and method A phased 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. Th... | 07/20/1999 |
| 5917866 | Code multipath estimation for weighted or modified tracking using weighted or modified correlations The apparatus and method for estimation and minimization of the residual multipath error signal are disclosed. The reduction of the multipath error signal is achieved by using the weighted or modified tracking. The estimation and minimization of the reduc... | 06/29/1999 |
| 5918161 | Method and apparatus for reducing multipath signal error using deconvolution A deconvolution approach to adaptive signal processing has been applied to the elimination of signal multipath errors as embodied in one preferred embodiment in a global positioning system receiver. The method and receiver of the present invention estimat... | 06/29/1999 |
| 5918164 | Radio communication apparatus A mean value of a received signal level is calculated by a mean value computing unit, a product of multiplying this received signal mean level by a prescribed ratio is calculated by a threshold computing unit and used as a first threshold value, and when ... | 06/29/1999 |
| 5905945 | Method and apparatus for improving the reliability of communicating a message from a portable subscriber unit to a base receiver in a two-way radio messaging system A portable subscriber unit (104) monitors (602) a signal fading rate in an outbound channel from a base station (102), and transmits a message. The portable subscriber unit transmits (606) the message once on an inbound channel in response to the signal f... | 05/18/1999 |
| 5894598 | Radio communication system using portable mobile terminal A radio communication system comprises a transmitting antenna for transmitting radio signals. Each radio signal is transmitted via one of a plurality of beams of different maximum radiated directions. The system also comprises a transmitting section for a... | 04/13/1999 |
| 5887037 | Introducing processing delay as a multiple of the time slot duration An apparatus for performance improvement of a burst mode digital wireless receiver has a processing circuit for processing a plurality of received signals and providing a processed signal and a delay circuit for introducing a predetermined delay to the pr... | 03/23/1999 |
| 5872776 | Signal detection and interference cancellation based on simplified matrix inversion for CDMA applications A multiuser detector for a CDMA system for real-time processing. Interference information of cross correlation from the signals of different users is processed to enhance the signal-to-noise ratio by suppressing the interference noise in a multiple-stage ... | 02/16/1999 |
| 5862455 | Fading simulator A fading simulator for generating multipath-faded test signals which have attenuation notches of precisely controllable frequency position and attenuation depth from a modulated input signal of known bandwidth. The input signal is fed to a splitter that d... | 01/19/1999 |
| 5815796 | Method for determining parameters for the design of ground equipment for a satellite link system and a method of transmitting signals in a satellite link system A method of determining parameters for the design of ground equipment for satellite link systems using duplex links is disclosed. The method has particular application to determining transponder power requirements and antenna size. The method comprises se... | 09/29/1998 |
| 5815115 | High speed wireless transmitters and receivers A wireless transmitter and receiver are used in a wireless telecommunication system and method including antennas having at least one antenna element with a relatively narrow beamwidth at both the transmitter and receiver for high data rate communication.... | 09/29/1998 |
| 5794128 | Apparatus and processes for realistic simulation of wireless information transport systems Realistic models and processes for simulation of wireless information transport systems are provided which replicate all time and frequency dynamics effects on stationary and mobile communications systems. The preferred embodiment is a realsitic modeling ... | 08/11/1998 |
| 5794123 | Fade recovery in digital message transmission systems A method of fade recovery in a digital message transmission system in which data is encoded into code words, formatted into frames of a batch and transmitted in accordance with one or more transmission formats, and a synchronization code word, indicative ... | 08/11/1998 |
| 5784363 | Arrangement in a multi-user system A multi-user system includes radio channels which are independent and uncorrelated for different users. The system operates with frequencies which, due to multi-path propagation, are more or less attenuated for one user and more or less amplified for anot... | 07/21/1998 |
| 5781152 | Method and circuit for the reception of signals for positioning by satellite with elimination of multiple-path errors The disclosure pertains to receivers for positioning by satellite. To reduce the harmful effects of the paths reflected on the GPS measurement of position which should take account only of the path of the radiofrequency signals in direct line of sight, a ... | 07/14/1998 |
| 5781845 | Adaptive transmitting antenna An adaptive transmitting antenna includes an array of antenna elements having respective weighing coefficients to respectively transmit components of a transmit signal which reduces locally reflective multipath signals received by the transmitting antenna... | 07/14/1998 |
| 5771456 | Enhanced suppression of multipath interference A method for suppressing the effects of multipath signals in determination of the location of a mobile user, using the speed or magnitude of the velocity v of the user to determine the procedure(s) to be used to determine the range or pseudorange values c... | 06/23/1998 |
| 5771439 | Adaptive antenna system and method for cellular and personal communication systems A signal processing system and method for improving reception of plural signals received at an antenna array in a wireless communication system by increasing the carrier-to-interference plus noise ratio and by decreasing signal envelope variance of each o... | 06/23/1998 |
| 5752167 | Radio propagation simulation method, wave field strength inference method and three-dimensional delay spread inference method Radio waves having frequencies f1 and f2 are radiated to the premises where a wireless LAN is to be constructed. The radio waves of f1 and f2 are received by an antenna for scanning the observation plane and a f... | 05/12/1998 |
| 5745075 | Multi-tone DGPS beacon transmitter and receiver An apparatus and a method for transmitting and receiving a signal having multiple tones for obviating destructive interference between a groundwave and a skywave of the signal. The multiple tones have a frequency offset that is calculated so that the dest... | 04/28/1998 |
