Abstract: A method and system is disclosed for reducing interference in a wireless communication system utilizing an antenna array. The antenna array uses one or more signal channels for communicating with one or more mobile terminals. First, at least one channel is assigned as an empty channel in which no desired signal is carried so as to provide a representation of all relevant interference. Since the spatial characteristics of the empty channel and the regular signal channels should be very similar, the spatial signature of the signal channels is analyzed based on the interference received on the empty channel and the desired signals received on at least one signal channel. The analyzed spatial signature is then used for reducing the interference on all signal channels.

Abstract: A method and system is disclosed for reducing multi-frequency signal interference in a wireless communication network. An available frequency spectrum is divided into a plurality of channels, a first wireless communication coverage unit is then segregated into a first number of geographical segments. After the segregated channels are grouped into a second number of channel blocks, each channel block is assigned to at least one of the segregated geographical segments with predetermined priorities.

Abstract: A TDD antenna array S-CDMA system for increasing the capacity and quality of a wireless communications is disclosed. By simultaneous exploiting the spatial and code diversities, high performance communications between a plurality of remote terminals and a base station is achieved without sacrificing system flexibility and robustness. The time-division-duplex mode together with the inherent interference immunity of S-CDMA signals allow the spatial diversity to be exploited using simple and robust beamforming rather than demanding nulling. Measurements from an array of receiving antennas at the base station are utilized to estimate spatial signatures, timing offsets, transmission powers and other propagation parameters associated with a plurality of S-CDMA terminals. Such information is then used for system synchronization, downlink beamforming, as well as handoff management.

Abstract: A method and system is disclosed for reducing multi-frequency signal interference in a wireless communication network. An available frequency spectrum is divided into a plurality of channels, a first wireless communication coverage unit is then segregated into a first number of geographical segments. After the segregated channels are grouped into a second number of channel blocks, each channel block is assigned to at least one of the segregated geographical segments with predetermined priorities.

Abstract: A method and system is disclosed for reducing multi-frequency signal interference in a wireless communication network. An available frequency spectrum is divided into a plurality of channels, a first wireless communication coverage unit is then segregated into a first number of geographical segments. After the segregated channels are grouped into a second number of channel blocks, each channel block is assigned to at least one of the segregated geographical segments with predetermined priorities.

Abstract: An improved enhancer is disclosed which uses a switch matrix to increase the isolation between two antennas. For either an reverse link or forward link communication, the enhancer has a first antenna for receiving an incoming signal, and a receiver sub-system that amplifies and converts the incoming signal from the first antenna to a first predetermined frequency band. The enhancer further has a demodulator coupled to the receiver sub-system for demodulating the converted signal, and detecting timing information thereof. Also contained in the enhancer is a transmitter sub-system operable with the receiver sub-system that converts the signal from the receiver subsystem to a second predetermined frequency band and further amplifies the signal. After the signal is thus enhanced, a second antenna is used for further transmitting the amplified signal from the transmitted sub-system.

Abstract: A method for estimating symbol sequences from multiple transmitters which communicate with common receivers sharing the same medium is disclosed. This invention can be used in wireless communications and wireline communications such as in cable modem sys terms and digital subscriber loops to speed up joint detection of symbol sequences of multiple transmitters to achieve low error probability. For convenience, only applications of this invention to wireless communications employing multiple antennas are described herein. The requirement for matrix operations like matrix inverses increase with the logarithm of the number of symbols instead of the number of symbols as with techniques based on Cholesky decomposition.

Abstract: A method and system is provided for estimating a first wireless communication channel (FWCC) transmitting a data stream from a first antenna system (FAS) to a second antenna system (SAS) in a telecommunication system, the telecommunication system having a second wireless communication channel (SWCC) for transmitting data from the MT to the antenna. First, one or more characteristics of the SWCC (SWCC Characteristics) are analyzed based on the data stream received by the antenna system from the MT. From the data stream received, an initial condition of the FWCC is also extracted.

Abstract: A method and system for reducing interference in a wireless communication network is disclosed. The wireless communication network has at least one base station using an antenna array and one or more code channels to receive or transmit one or more communication signals from or to a plurality of terminals used by one or more users. A signal received by the antenna array carries one or more training sequences and a traffic signal in a frame. After estimating a spatial signature and joint channel response model per user based on the training sequences, one or more spatial weights are found based on the estimated spatial signature and joint channel response model to maximize a signal to noise ratio. A joint detection matrix is then formed based on the estimated spatial weights, the joint channel response model, and a user code channel assignment.

Abstract: A method and system for multi-cell interference reduction in a wireless communication system is disclosed. The present disclosure describes a new method and system for accurately detecting the characteristics of the interfering signals from relevant sources such as neighboring co-channel cells and other persistent interference sources. In order to better estimate the interfering signals, a base station designates a small inactive window in the transmit frame for a cell during which the communications between the base station and its terminals are reduced while every other communication pursues. As such, the interfering signals can be well exposed and the characteristics can be accurately detected. Based on the detected characteristics of the interfering signals, the base station can specifically design beam forming mechanism or other means to cancel or minimize the impact of such interference during regular communications.

Abstract: A method and system is disclosed for reducing multi-frequency signal interference in a wireless communication network. An available frequency spectrum is divided into a plurality of channels, a first wireless communication coverage unit is then segregated into a first number of geographical segments. After the segregated channels are grouped into a second number of channel blocks, each channel block is assigned to at least one of the segregated geographical segments with predetermined priorities.

Abstract: A method and system is provided for estimating a first wireless communication channel (FWCC) transmitting a data stream from a first antenna system (FAS) to a second antenna system (SAS) in a telecommunication system, the telecommunication system having a second wireless communication channel (SWCC) for transmitting data from the MT to the antenna. First, one or more characteristics of the SWCC (SWCC Characteristics) are analyzed based on the data stream received by the antenna system from the MT. From the data stream received, an initial condition of the FWCC is also extracted.

Abstract: A method and system is provided for estimating a first wireless communication channel (FWCC) transmitting a data stream from a first antenna system (FAS) to a second antenna system (SAS) in a telecommunication system, the telecommunication system having a second wireless communication channel (SWCC) for transmitting data from the MT to the antenna. First, one or more characteristics of the SWCC (SWCC Characteristics) are analyzed based on the data stream received by the antenna system from the MT. From the data stream received, an initial condition of the FWCC is also extracted.

Abstract: A method and system is provided for estimating a first wireless communication channel (FWCC) transmitting a data stream from a first antenna system (FAS) to a second antenna system (SAS) in a telecommunication system, the telecommunication system having a second wireless communication channel (SWCC) for transmitting data from the MT to the antenna. First, one or more characteristics of the SWCC (SWCC Characteristics) are analyzed based on the data stream received by the antenna system from the MT. From the data stream received, an initial condition of the FWCC is also extracted.

Abstract: In a synchronous code division multiple access (SCDMA) time division duplex (TDD) communication system, a remote terminal uses both open loop and closed loop techniques for synchronization with a base station. The timing of reception of information by tile remote terminal is performed with an open loop technique, while the timing of transmissions from the terminal is performed with a closed loop technique. Furthermore, a clock locked loop in the terminal compensates for differences between clocks of the terminal and the base station. The clock locked loop responds to signals from both the aforesaid open loop and closed loop techniques.

Abstract: A code division multiple access time division duplex communication system having an adaptive antenna array station communicates beamformed orthogonal code channels to a remote station. The remote station determines the amplitude and phase components of the received code channels and communicates the information back to the adaptive antenna array station which uses the information plus the beamform of the received signal in an adaptive antenna array station calibration process. By varying one of the beamforms received by the remote station, sufficient data points may be gathered to facilitate accurate calibration. The calibration procedure may be performed while voice or other digital information is communicated between the remote station and the adaptive antenna array station.

Abstract: A communication system having an adaptive antenna array subsystem generates calibration information for the adaptive array subsystem by measuring the amplitude and phase of modulated signals within the subsystem at the antenna array mount and at the back plane mount for the transmit and receive array. The calibration information is used to more accurately perform beamforming for both received an transmitted information signals. The communication system uses a time diversity duplex (TDD) synchronous code division multiple access (SCDMA) protocol for wireless communication between remote terminals and a base station. The calibration means uses a combination combiner and splitter having matched micro strip lines incorporated into a printed circuit board in either the antenna array mount or the back plane.

Abstract: A code division multiple access time division duplex communication system having an adaptive antenna array station communicates beamformed orthogonal code channels to a remote station. The remote station determines the amplitude and phase components of the received code channels and communicates the information back to the adaptive antenna array station which uses the information plus the beamform of the received signal in an adaptive antenna array station calibration process. By varying one of the beamforms received by the remote station, sufficient data points may be gathered to facilitate accurate calibration. The calibration procedure may be performed while voice or other digital information is communicated between the remote station and the adaptive antenna array station.

Abstract: A TDD antenna array S-CDMA system for increasing the capacity and quality of a wireless communications is disclosed. By simultaneous exploiting the spatial and code diversities, high performance communications between a plurality of remote terminals and a base station is achieved without sacrificing system flexibility and robustness. The time-division-duplex mode together with the inherent interference immunity of S-CDMA signals allow the spatial diversity to be exploited using simple and robust beamforming rather than demanding nulling. Measurements from an array of receiving antennas at the base station are utilized to estimate spatial signatures, timing offsets, transmission powers and other propagation parameters associated with a plurality of S-CDMA terminals. Such information is then used for system synchronization, downlink beamforming, as well as handoff management.

Abstract: A wireless communication system has a protocol enabling synchronous code division multiple access (CDMA) communication on a time division duplex (TDD) frequency, and provides for a smart antenna system as an integral component of the system. The protocol has downlink time slots (DTS) which provide for synchronization and paging of all remote terminals from a base station on a omnidirectional code channel and while providing for traffic signals on directional traffic channels. The protocol has uplink time slots (DTS) which enable rapid link requests by remote terminals, as well as enabling improved spacial estimation, synchronization and power control of remote terminals by the base station.