Abstract: Techniques to more efficiently transmit pilot and signaling on the uplink in an OFDM system. With subband multiplexing, M usable subbands in the system are partitioned into Q disjoint groups of subbands. Each subband group may be assigned to a different terminal for uplink pilot transmission. Multiple terminals may transmit simultaneously on their assigned subbands. The transmit power for the pilot may be scaled higher to attain the same total pilot energy even though S instead of M subbands are used for pilot transmission by each terminal. Pilot transmissions from the terminals are received, and a channel estimate is derived for each terminal based on the pilot received on the assigned subbands. The channel estimate comprises a response for additional subbands not included in the assigned group. Subband multiplexing may also be used for uplink signaling transmission.

Abstract: An apparatus for detecting forward and reverse link imbalances in a digital cellular communication system is provided. An indication of maximum access probes is used to determine whether a link imbalance caused a reverse link failure to occur. The maximum access probes condition indicates that a wireless unit has attempted to access a base station a pre-defined maximum number of times. An indication of a lost paging channel and a traffic channel initialization (TCI) time out is used to determine whether a link imbalance caused a forward link failure to occur. If the wireless unit did not lose the paging channel, the apparatus determines whether a TCI time out occurred. If the wireless unit lost the paging channel, or it did not lose the paging channel but a TCI time out occurred, the apparatus determines the cause for the forward link failure.

Abstract: A system and method for deciding whether to initiate an idle handoff in a wireless communications system is disclosed. A mobile station having an integrated chip and software instructions executed by that chip obtain samples at first and second times of the pilot signals radiated by first and second base stations. A determination is then made whether to initiate an idle handoff based upon a comparison of the total strengths of the second time samples and a position-weighting term with a design constant. The position-weighting term accounts for the change in position of the mobile station relative to the first and second base stations in between the first and second sample times. The position-weighting term may itself be weighted to account for the strength of the earliest arriving multipath component of the first and second pilots relative to the total strength of the first and second pilots.

Abstract: A voice and data communication system and method for receiving symbols for a plurality of channels into chunks included within buffers, each chunk holding symbols for only a corresponding one of the plurality of channels. As complete frames are received and decoded, the chunks holding the symbols, that are decoded, are freed up to be used for reception of newly arriving symbols included in newly arriving frames.

Abstract: A hands free telephone system includes a telephone having audio circuits for processing an audio signal and a telephone audio connector for transmitting the audio signal between the audio circuits and the telephone audio connector. A telephone holder has a holder program for instructing the telephone holder to perform telephone functions in accordance with the stored program. The telephone holder has a holder audio connector for mechanically mating with the telephone audio connector and transmitting the audio signal between the telephone audio connector and the programmable holder.

Abstract: A wireless communication with a receiver subsystem capable of supporting communications operating on two or three distinct frequency bands while incorporating only one or two oscillating devices, respectively. For example, such a subsystem could be integrated in a wireless communication hand-held device configured to operate within three frequency ranges in order to support Cellular, PCS, and GPS services. The receiver subsystem includes a receiver subsystem front end configured to receive first, second, and third receive signals operating under three different frequency bands. The three receive signals are subjected to front-stage filtering, low-noise amplifier, and bandpass filtering in order to remove any unwanted radio frequency components. The first signal is subsequently down-converted into an IF signal by mixing it with a first reference signal generated by a first voltage controlled oscillator (VCO).

Abstract: In a concatenated code data, correctly decoded code words from a block decoder is utilized to improve the performance of the convolutional decoder. A code word can sometimes be correctly decoded prior to receipt of all the symbols for the code word. Early decoding of the code word allows for the correct recreation of the entire code word, even the symbols which have not yet been received. The entire corrected code word is used by the convolutional decoder to eliminate branches the trellis, thus improving decoding of prior data bits and future data bits in the trellis. The chain back distance of the convolutional decoder can also be made shorter based on the knowledge that some of the received code words have been correctly decoded. Finally, the parity symbols which have not yet been received for the correctly decoded code word can be eliminated from transmission to improve the overall transmission rate.

Abstract: A method for determining the position of a mobile station within a cellular telephone system having a plurality of base stations. A signal is transmitted at a low power level from the mobile station. The strength of the signal is then temporarily increased from the low power level to an increased power level, and the signal is temporarily transmitted from the mobile station at this increased power level. While the signal is being temporarily transmitted from the mobile station at the increased power level, the signal is used to make at least a first positional measurement. The position of the mobile station is determined in accordance with the first positional measurement.

Abstract: A method and apparatus are described for controlling the data rates for communications to and from a base station and a plurality of remote users. The usage of the communications resource whether the forward link resource (from base station to remote users) or reverse link resource (from remote users to base station) is measured. The measured usage value is compared against at least one predetermined threshold value and the data rates of communications or a subset of communications on said communications resource is modified in accordance with said comparisons.

Abstract: The present invention is a method and apparatus for integrating a personal communication system with a cable television plant. A set of radio antenna devices (RAD) are connected to the cable plant. The RADs provide frequency conversion and power control of signal received from the cable plant for wireless transmission to the remote units. The RADs also provide power control and frequency conversion of wireless signals received from the remote units for transmission by the RADs onto the cable plant. In addition to the functions of standard base stations and centralized controller, the CATV base station must also compensate for gain variations in the cable plant. The downstream power control is regulated by a RAD reference signal which can be hidden within the CDMA signal for maximum efficiency. The upstream power control is regulated by an upstream gain reference signal which is individually transmitted by each RAD on the upstream link.

Abstract: An improved method and apparatus for canceling echo is disclosed. The echo canceller of the present invention compensates for the existence of quantization error in the echo signal that does not exist in the reference signal by introducing the quantization effects into the reference signal. The quantization effects are typically companding quantization errors caused by the A-law and .mu.-law quantizers prevalent in digital communications equipment.

Abstract: A method and apparatus for characterizing a communications link. An apparatus is disclosed for performing a series of tests that measure delay time, frequency response, background noise, frame error rate and sample slipping and repetition measurements. A signal generator generates a series of signal optimally selected for the particular test. The generated signal is transmitted through the communication system and then sent back through the system by a loop back element remotely placed. The return signal is then analyzed by a monitor means.