Abstract: A method for signal reception in a Multiple-Input-Multiple-Output (MIMO) communication system is provided. The method enhances the efficiency of signal reception in the MIMO system and simplifies the algorithms of signal reception and soft decoding metrics generation. In other words, soft decisions are generated according to correlations between metrics corresponding to least reliable bits based on MMSE linear estimation and noise variance estimation is provided to improve performance when an error is generated in channel matrix H estimation.

Abstract: A CDMA transmitter that limits the peak-to-average ratio to a selected maximum level. The CDMA transmitter comprises: 1) a first baseband combiner for receiving N baseband chip streams, each of the N baseband chip streams comprising a sequence of chips, each chip having one of a positive amplitude value and a negative amplitude value, wherein the first baseband combiner combines chips from corresponding time slots in each of the N baseband chip streams to thereby generate a first composite baseband chip sequence; 2) a data processor for detecting a first peak amplitude in the first composite baseband chip sequence that exceeds a pre-determined maximum threshold and determining an amplitude and a polarity of a first compensation pulse associated with the first peak amplitude; and 3) a pulse generator for generating the first compensation pulse having the amplitude and the polarity determined by the data processor.

Abstract: A demodulator for demodulating a set of S possible orthogonal modulation codes received serially as binary data, wherein each of the orthogonal modulation codes comprises M binary bits representing an N-bit data symbol and wherein M=2N.

Abstract: A CDMA receiver for detecting a pilot channel signal having a known pseudo-random noise (PN) chip sequence, the known PN chip sequence comprising a plurality of known Logic 1 chips and a plurality of known Logic 0 chips.

Abstract: A system and method is disclosed for providing service negotiation during a hard handoff of a mobile station to a target base station in a wireless communication system. The target base station negotiates a Service Option with the mobile station using service negotiation messages. The mobile station receives the Service Option from the target base station and uses the Service Option to communicate with the target base station. The target base station and the mobile station each comprise a service negotiation controller that is capable of exchanging service negotiation messages to negotiate the Service Option for the mobile station.

Abstract: Two radio systems are provided for each coverage area within a wireless communications system, each radio system supporting a different wireless communications standard with at least one of the standards being compatible with the other (such as the backward-compatibility of either of 1xEV-DO or 1xEV-DV with IS-2000). Both of the radio systems may have a sectored configuration for selected coverage areas while a combination of sectored and omni configurations are employed for the radio systems for other coverage areas. When communications with a mobile station utilizing one standard fails within a coverage area due to antenna, radio frequency path, or radio system failure, wireless communications with that mobile station is automatically resumed utilizing the other, compatible wireless communications standard.

Abstract: A demodulator for demodulating a set of S possible orthogonal modulation codes received serially as binary data, wherein each of the orthogonal modulation codes comprises M binary bits representing an N-bit data symbol and wherein M=2N.

Abstract: A base station controller in a wireless system is comprised of a set of vocoders that are TTY/TDD Baudot code-capable in addition to the non-TTY/TDD Baudot code-capable vocoders. The base station selects one of the two types of vocoders to communicate with the mobile station based on the capabilities of a mobile station that is communicating with the base station. The mobile station can indicate its capabilities by transmitting its unique identification for use by the wireless system in searching a database of TTY/Baudot code-capable mobile stations.

Abstract: A system and method is disclosed for increasing a data transmission rate in mobile wireless communication channels. The invention comprises a base station that is capable of sending data packets to a mobile station at a first data rate and then sending replacement data packets to the mobile station at a second higher data rate to replace missing or error data packets. The mobile station comprises a replacement data packet controller that replaces missing or error data packets with replacement data packets. During a handoff of the mobile station a first base station sends an A3 physical transition directive message to a second base station to increase bandwidth on a supplemental channel for sending replacement data packets to the mobile station. The bandwidth is decreased after the mobile station receives the replacement data packets.

Abstract: A CDMA receiver for detecting a pilot channel signal having a known pseudo-random noise (PN) chip sequence, the known PN chip sequence comprising a plurality of known Logic 1 chips and a plurality of known Logic 0 chips.

Abstract: A system and method is disclosed for improving downlink performance of an adaptive antenna array in a vehicular environment. The system comprises a mobile station that has a first mobile antenna and a second mobile antenna. A spatial signature estimator associated with a base transceiver station obtains spatial signatures from signals from the first mobile antenna and from the second mobile antenna within an uplink interval. Correlation circuitry uses the spatial signatures to identify a least changing spatial signature to obtain an optimal downlink beamforming weight vector to be used in the transmission of a signal to the mobile station in the next downlink interval.

Abstract: A CDMA transmitter that limits the peak-to-average ratio to a selected maximum level. The CDMA transmitter comprises: 1) a first baseband combiner for receiving N baseband chip streams, each of the N baseband chip streams comprising a sequence of chips, each chip having one of a positive amplitude value and a negative amplitude value, wherein the first baseband combiner combines chips from corresponding time slots in each of the N baseband chip streams to thereby generate a first composite baseband chip sequence; 2) a data processor for detecting a first peak amplitude in the first composite baseband chip sequence that exceeds a pre-determined maximum threshold and determining an amplitude and a polarity of a first compensation pulse associated with the first peak amplitude; and 3) a pulse generator for generating the first compensation pulse having the amplitude and the polarity determined by the data processor.

Abstract: A vehicle identification system for identifying motor vehicles in a group of vehicles at distances in excess of 200 feet is disclosed. The system includes an interrogator for directionally broadcasting an interrogation signal toward a vehicle of interest and a set of vehicle identification tags attached to the vehicles for receiving interrogation signals and sending a response signal to the interrogator. The response signal consists of information from the memory in the vehicle identification tag which allows the interrogator to identify the ownership or registration of the vehicle. Preferably, the tags have at least two memory portions with one portion being more secure than the other. Information useful to law enforcement agencies may be stored in the more secure memory portion and information for public or commercial use, such as parking access codes and toll information may be stored in the less secure memory portion.