Abstract: In a method in a transceiver for selecting a communication parameter for communicating with a concentrated subscriber unit, wherein the concentrated subscriber unit includes a plurality of subscriber terminals, a subscriber terminal identification number of one of the subscriber terminals is determined. Next, N number of selected digits in the subscriber terminal identification number are set equal to predetermined values to produce a modified subscriber terminal identification number. the modified subscriber terminal identification number is then hashed using a hashing function to produce a communication parameter indicator. Finally the communication parameter is selected in response to the communication parameter indicator, wherein groups of subscriber terminal identification numbers having non-selected digits with the same value are hashed to produce the same communication parameter indicator. The communication parameter selected may be a carrier frequency used by the communications system.

Abstract: In a wireless communications system using orthogonal transmit diversity, wherein the orthogonal transmit diversity signal is produced by a transmitter having first and second radio frequency diversity signals for transmitting from first and second transmit diversity antennas, a radio frequency sample signal that represents the sum of the first and second radio frequency diversity signals is produced. The radio frequency sample signal is then down-converted to produce a down-converted signal having first and second components corresponding to the first and second radio frequency diversity signals, respectively. Thereafter, a first time reference of the first radio frequency diversity signal is recovered from the first component. Finally, a characteristic of the second component that is indicative of a difference in delay between the first and second radio frequency diversity signals is measured using the first time reference.

Abstract: A method for determining a subscriber unit location in a communication system is provided. The method includes the steps of receiving a signal from the subscriber unit at a first base station, determining a first receive time of the signal based on a sequence of spreading symbols at the first base station, determining a first angle of arrival of the signal at the first base station, and determining the location of the subscriber unit from the first receive time, the first angle of arrival, and further predetermined information about the first base station. The signal is formed via modulation by the sequence of spreading symbols.

Abstract: The wireless communication system transmits signals using radios (205). The radios (205) receive a signal which is formatted for transmission (602). The formatted signals from the radios (205) are divided. One formatted signal is input directly to a transform matrix (207) and a copy of the formatted signal is input to a delay (206) before being input to the transform matrix (207). Transform matrix (207) transforms (604) the input signals into output signals that each contain a portion of the input signals. The outputs from the transform matrix (207) are then amplified (605) using the amplifiers (208). The outputs from the amplifiers (208) are inverse transformed (606) in an inverse transform matrix (209). The inverse transform matrix (209) serves to recombine the portions of the signals originally input to the transform matrix (207). The resulting signals are then transmitted using antennas (210).

Abstract: A multi-channel transmitter (200) in accordance with the present invention overcomes the disadvantages of applying adaptive antenna array technology to multi-channel communication systems. The multi-channel transmitter includes a channel processing element (210), a plurality of radio frequency processing elements (206), and an antenna array (102). The channel processing element includes a channel processor adapted to receive a communication signal from a communication network, a splitter (216) coupled to an output of the channel processor for producing a plurality of substantially identical processed digital communication signal outputs. A plurality of gain and phase adjusters (214) in the channel processing element are coupled to the substantially identical processed digital communication signal outputs. An output of each phase and gain adjuster (214) is coupled to a plurality of up-converters (212), which each produce a digital intermediate frequency output.

Abstract: A frame to cell converter (413) uses a process for converting a data transmission stream for transportation in a cell-based network (102). The frame to cell converter (413) receives a data transmission stream from a data source to produce a received data transmission stream. The received data transmission stream may be either a synchronous data stream or an asynchronous data stream. An address translation is performed based on the data source to produce a unique address identifier. The unique address identifier and a portion of the received data transmission stream are employed to create an ATM cell (238) for transportation within the cell-based network (102).

Abstract: In a hybrid matrix amplifier array (100), a configurable digital transform matrix (116) is initialize with a matrix of transform coefficients. A plurality of digital input signals (M.sub.1 -M.sub.4) are received at inputs of the configurable digital transform matrix (116). The plurality of digital input signals are transformed to produce a plurality of transform digital signals (A.sub.1 -A.sub.4) using the matrix of transform coefficients. The plurality of transform digital signals are converted to a plurality of transformed analoged signals (206) to produce a plurality of transformed analog signals. The transformed analog signals are amplified (104, 208) to produce amplified transformed signals. Finally, the amplified transformed signals are inverse transformed (102, 210) to produce output signals that correspond to a respective digital input signal (M.sub.1 -M.sub.4).

Abstract: In a data processing system, a stored environmental model of a wireless communication system is selected. The model locates at least one object in relation to a transmitter. A parent image node is created in an image tree, wherein the parent image node is associated with the transmitter. Child image nodes are created in the image tree only for each object that can redirect a propagating signal from the transmitter with a signal characteristic that exceeds a threshold. The child image node is associated with an object energized by the transmitter, and a corresponding child image in the environment model. Next, a point of interest in the environmental model is selected. Thereafter, an accounting is made for contributions to the signal characteristic at the selected point of interest from each of the child images corresponding to the child image nodes.

Abstract: A communications system including a cell-based switching system for routing a data stream between a source node and a destination node. A data stream is received at the source node, which performs a first type of address translation to identify a first portion of the path between the source node and destination node. The data stream is sent to the first portion of the path and received by at least one intermediate node that performs a second type of address translation to identify another portion of the path between the source node and destination node. In response to receiving the data stream at the destination node, the first type of address translation is performed to identify a target within the destination node for the data stream.

Abstract: A method and apparatus for mitigating error in a received communications signal includes an error mitigator (35) of a communication unit (12) which receives and performs mitigation based on an error indication. In a first embodiment the error indication is a phase or non-used data symbol indicating error in ADPCM data, and mitigation includes changing certain nibble values to different predetermined values. In a second embodiment the error indication may include other parameters, e.g., a CRC frame error indicator, and an error estimator (34) determines a level of corruption in the ADPCM data. The error mitigator (35) applies a predetermined set of replacement values based on the indicated level of corruption and the mitigated data is subsequently decoded in an ADPCM decoder (26).

Abstract: In a hybrid matrix amplifier array (100), the amplitude of each of a plurality of input signals is measured (132-136, 202). In response to the signal amplitude measurements, an overload condition that will result in an amplifier overload in said hybrid matrix amplifier array is estimated (204, 206, 138). In response to the estimation of the overload condition, the signal amplitude of at least one of the plurality of input signals is modified to prevent the overload condition in the hybrid matrix amplifier array. An overload condition may be estimated if the sum of the amplitudes of the input signals exceeds a threshold (206). In one embodiment, all input signals are modified by proportionately reducing the amplitude of each of the plurality of input signals (304).

Abstract: An input signal (102) and a dithering signal (106) are coupled to an input of a n by m transform matrix (98). The input signal (102) and the dithering signal (106) are transformed to produce m transformed signals, which are then amplified using a plurality of amplifiers (64). The amplified signals are then input into an m by n inverse transform matrix (100) that performs an inverse transform to produce a low noise output signal. The low noise output signal may be passed through a band pass filter (74) to remove out-of-band noise derived from the dithering signal and provide a filtered output signal (110). The transform matrix (98) and inverse transform matrix (100) may be implemented with Fourier transform matrices or a Butler transform matrices.

Abstract: A receiver (100), transmitter (200) and transceiver (400) in accordance with the present invention overcome the disadvantages of applying adaptive antenna array technology to multi-channel communication systems. Multi-channel radio frequency (RF) signals received via an adaptive antenna array (102) are converted from an analog form to a digital form prior to splitting and processing to recover communication channels contained therein. A number of digital communication signals are digitally combined into a multi-channel digital signal and converted from the digital form to an analog radio frequency form prior to transmission from the adaptive antenna array.

Abstract: In a resource limited communication system having at least one physical channel shared by a plurality of time divided users, a method is provided of dynamically adjusting a maximum number of users allowed access to the at least one physical channel. The method includes the steps of calculating a voice activity factor for each user of the plurality of time divided users and adjusting the maximum number of users based upon the calculated voice activity factors. An apparatus is provided for implementing the described method.

Abstract: A method for improved frequency assignment includes recording communications events (130), for example handoff statistics, for subscriber units handing to and away from a base station (931). The handoff statistics include the IDs of the other base stations (932-937) involved in the handoff, preferably along with the date and time of the handoff. The statistics of the handoff count are applied based on the number of occurrences within a time period (140), and are used to accept or reject the potential frequency assignments obtained from an assignment process. In one embodiment of this process, using a Q estimate, obtained from residual powers recorded on each frequency (430-435), a candidate frequency is chosen based on the lowest Q value (440). This candidate is tested against the handoff statistics, and if rejected, a frequency with the next lowest Q level is tested (450-470). This process is repeated until a frequency is assigned.

Abstract: The dual mode communication network comprises a first communication system having a frame structure and a first traffic channel protocol and a second communication system having the frame structure and a second traffic channel protocol. In the network, only one of the first and second traffic channel protocols supports forward error correction coding.

Abstract: A method and system in a data processing system for resynchronizing a received data stream with a master clock having a master clock frequency, wherein the received data stream is clocked with a received data clock that is out of phase with the master clock by an arbitrary number of degrees. The master clock and the received data clock are compared at a frequency of a resynchronization clock for a predetermined number of times to produce comparison results. The resynchronization clock frequency may be less than the frequency of the master clock. The comparison results are analyzed to produce a relative phase indicator. In response to the relative phase indicator exceeding, or being less than, a phase shift threshold, the received data stream is reclocked at a rising or falling edge of the master clock to produce a resynchronized data stream, wherein the resynchronized data stream is synchronized with the master clock and contains the data of the received data stream.

Abstract: In a method and system for producing a plurality of antenna element signals that produce a selected antenna array pattern, first (56) and second (58) input signals are coupled to first (82) and second (84) amplifiers, respectively. The amplitude of said first input signal is modified (68) according to a first factor to produce a first modified signal, and the amplitude of said second input signal is modified (66) according to a second factor to produce a second modified signal. The first input signal is combined (48) with the second modified signal to produce a first combined signal, and the second input signal is combined (50) with the first modified signal to produce a second combined signal. Thereafter, the first combined signal and the second combined signal are amplified using first (82) and second (84) amplifiers, respectively. Next, the amplified signals are transformed with a transform matrix (96) to produce the plurality of antenna element signals.