Abstract: Disclosed are a method and system for transmitting and receiving traffic, by a plurality of backhaul collector sites, to and from transceivers associated with sectors of a backhaul frequency reuse plan using a backhaul portion thereof. The method and system further transmit and receive traffic, at a backstretch super collector site of a backstretch cell, to and from alternate or a subset of backhaul collector sites of the plurality of backhaul collector sites surrounding the backstretch collector site.

Abstract: Disclosed are a method and system for transmitting and receiving traffic, by a plurality of backhaul collector sites, to and from transceivers associated with sectors of a backhaul frequency reuse plan using a backhaul portion thereof. The method and system further transmit and receive traffic, at a backstretch super collector site of a backstretch cell, to and from alternate or a subset of backhaul collector sites of the plurality of backhaul collector sites surrounding the backstretch collector site.

Abstract: Various embodiments are described to address the need for providing wireless backhaul that may reduce operator startup costs while avoiding some of the drawbacks present in the prior art approaches. Generally expressed, the wireless network equipment (WNE) (121) of a collector cell provides access to a backhaul network (151) to one or more neighboring cells (122) via in-band wireless signaling. Given the frequency bands used by the collector cell WNE for communication with remote units, one portion of each band used for user traffic while another portion of each band is used for backhaul traffic. Having backhaul and user traffic share the assigned frequency bands can eliminate the need to license additional bands for wireless backhaul. Moreover, utilizing a portion of the existing, in-band orthogonal channels may be more spectrally efficient than using a separate radio in the same band.

Abstract: The present invention provides a method of adjusting channel powers during operation of a wireless communication system. A relatively few pieces of operating data are obtained from the wireless communication system and simulation techniques are used to identify potential system performance problems. A revised set of channel powers are formulated to correct the potential system performance problems. The performance improvement of the revised set of channel powers is verified using simulation techniques, and then the revised set of channel powers is implemented in the wireless communication system.

Abstract: A code division multiple access (CDMA) communication system (100) has improved control by accurately characterizing coverage and loading parameters related to the CDMA communication system (100). To accurately characterize coverage and loading parameters related to the CDMA communication system, parameter meshes corresponding to parameters of the CDMA communication system are generated. The parameter meshes are evaluated, either individually or in combination, to provide comprehensive information regarding the performance of the CDMA communication system. Based on the results of the evaluation, a controller (113) within the CDMA communication system (100) controls the parameters to improve call quality, loading, etc. of the CDMA communication system (100).

Abstract: The method operates in a wireless communication system serving a geographic area. The system includes first and second communication units within the geographic area which have first and second radio frequency (RF) channels associated therewith. The method includes defining a plurality of points within the geographic area; selecting an initial power of the first and second RF channels; identifying, at each of the plurality of points, a number of the first and second RF channels which are receivable; evaluating a system performance metric; adjusting the initial power of one of the first and second RF channels; based on the adjusted power re-identifying, at each of the plurality of points, a number of the first and second RF channels which are receivable; re-evaluating the system performance metric; based on the re-evaluation, accepting the adjusted power; and downloading the adjusted power to the wireless communication system.

Abstract: In a communications system having transmissions containing certain information-of-interest at predetermined intervals in the transmission, there is provided a method for isolating and processing that information-of-interest. The method comprises sensing the start of a transmission and isolating for processing as the information-of-interest, the information received about instant(s) predeterminally removed in time from the sensed start of transmission. Thus, the information-of-interest is isolated principally on the basis of elapsed time.

Abstract: A method and apparatus for understanding information relating to communication system performance, including the dynamic nature of the system is provided. Elements of the system are represented (102, 110) as various shapes (30, 32, 40) defined by an number of different parameters on a display device (24). The shapes are characterized by a number of defining parameters and these defining parameters have an association with performance characteristics or performance parameters of the system element. As performance parameter data changes with time, e.g., during system operation, the defining parameters are altered such that the shape representing the system element is modified (106, 114). In this manner a large number of system elements and associated performance characteristics and the time varying nature thereof can be readily displayed to aid the system operator.

Abstract: A method and apparatus are provided for maximum likelihood sequence estimation. The method and apparatus includes a first maximum likelihood sequence estimator signal path for flat fading and an at least second maximum likelihood sequence estimator signal path for other than flat fading. The method and apparatus for further includes selecting the signal path with a least relative magnitude mean square error.

Abstract: A communication system dynamically assigns channels to a subscriber unit so as to, inter alia, mitigate the effects of co-channel interference in the system. The communication system has a plurality of base-stations receiving the transmission of a subscriber unit desiring service. Upon receipt of the subscriber unit's transmission, each base-station determines a signal quality value, which it then reports to a system controller. The system controller determines the best signal quality value reported and assigns a channel to the base-station which reported the best signal quality value. The chosen base-station transmits to the subscriber unit on an assigned channel to establish communication. The assigned channel transmitted by the chosen base-station need not be associated with the channel the subscriber transmits on. In fact, either channel may be any one of the channels allocated for use by the communication system.

Abstract: In a communications network having time-dispersed signals, there is provided a mechanism for soft decision decoding. It comprises: radio reception of a time-dispersed signal, at least partly equalizing those time-dispersal effects, recovering information contained in the signal, multiplying with that recovered information the absolute value of that at-least-partly-equalized signal (scaled by a number derived from channel conditions over a time during which at least part of the information to be recovered is distributed), and error-correcting the multiplied information by a Viterbi algorithm channel decoding scheme of error correction. Accordingly, soft decision information is generated from within the equalization process itself.

Abstract: An equalization system for equalizing a corrupted signal is disclosed. The equalization system includes a complex matched filter (400) and a maximum likelihood sequence estimator (MLSE) (405) for removing the effects of phase shift, amplitude variations, intersymbol interference, etc. resulting from multi-pathing and noise contributed by the receiver front end. The system estimates a correlation signal C(t) (505) and synchronizes C(t) 505 to maximize its energy as seen on the taps of the complex matched filter (400). Taps having amplitude coefficients below a predetermined threshold are set to zero to produce a modified CIR estimate. The modified CIR estimate which has had the effects of noise virtually eliminated, is then used to construct the complex matched filter (400) and is also used as input to the MLSE (405) to produce a better equalized data signal.

Abstract: The present invention relates to a method and apparatus for providing carrier frequency offset compensation in a time division multiple access (TDMA) communication system. In this effort a TDMA receiver is adapted to receive, via a transmission channel, a transmitted signal burst which includes a synchronization signal pattern, a message signal portion and at least one known portion, in a TDMA time slot. Initially, a phase error at that portion of the received signal which corresponds to the known portion of the transmitted signal is determined. Thereafter, various received signal parameters are adjusted in order to eliminate the phase error and thereby compensate for any carrier frequency offsets.

Abstract: A method and appartus for diversity reception in a communication system wherein at least a dual branch receiver is provided with a stored replica of expected reference information that is correlated with the received time-dispersed signals to obtain an estimate of the transmission channel's impulse response as seen by each branch, and determine, among other things, phase error between the branch local oscillators and the time-dispersed signals. Matched filters are constructed which then coherently align the time-dispersed signals from each branch with that branch's local oscillator, also constituting the first part of the equalization. The diversity processing stage may perform bit by bit selection on the re-aligned signals, maximal ratio combining of the re-aligned signals, or equal gain combining of the re-aligned signals, following each by a sequence estimation which uses similarly selected or combined channel distortion compensation parameters to complete the equalization process on the new signal.

Abstract: A time division multiple access (TDMA) radio system conveying a quadrature phase shift keying (QPSK) modulated data signal is disclosed. In order to overcome multipath distortion and phase variation introduced by the radio channel, a synchronizing poriton of a TDMA timeslot is transmitted in only one vector of the QPSK modulation. The system utilizes the one vector synchronizing portion to develop a channel profile estimate which is applied to the received message portion of the QPSK data signal to compensate for the multipath distortion and phase variation during one TDMA timeslot.

Abstract: The method and apparatus for rapid phase acquisition and random radio channel phase error compensation for a TDMA QPSK receiver is disclosed. Received quadrature signals having a known synchronizing sequence transmitted on one of the vectors is correlated to a local replica of the sequence. The output correlation detection signals are held for the duration of the TDMA timeslot and multiplied by the received quadrature signals to produce two pairs of products. The mutually exclusive product pairs are summed to recover data having the random phase error compensated.

Abstract: A method and apparatus for phase-coherently demodulating a multipath-impaired time division multiple access QPSK data timeslot is disclosed. A quadrature separator generates multipath-impaired intermediate signals which, during a predetermined synchronizing sequence for the timeslot, are applied to a pair of synchronizing correlators to generate quadrature multipath profiles. These profiles then are used to modify subsequently received QPSK timeslot signals at the separator outputs to coherently construct multipath compensated I and Q channel data.

Abstract: A cellular system employing time division messages transmitted from a plurality of radiators in each cell is disclosed. A first electromagnetic signal at a particular frequency is transmitted during one time slot from one of the plurality of radiators. A second electromagnetic signal at the same frequency is transmitted during another time slot from a second one of the plurality of radiators. A remote unit selects the best electromagnetic signal and communicates the selection to a cell controller, which selects a third time slot for transmission of a message from the radiator transmitting the best electromagnetic signal.

Abstract: An adaptive audio filter system is disclosed which comprises a filter means capable of producing a plurality of frequency response characteristics. A control signal generating means provides a control signal to the filter means to enable a particular frequency response. The control signal is based upon the signal to noise ratio.

Abstract: A data message transmission system for a cellular radiotelephone system is disclosed. Data to be transmitted is converted into a format compatible with radio transmission prior to transmission. The data is reconverted to its original format following reception. Handoff is accomplished by halting the data transmission prior to handoff and resuming data transmission after handoff. Call supervision occurs via busy-idle bit coding.