Adicom Wireless, Inc.

Carlson Wireless, Inc.

Ronald Ross

Christopher Flores

Karl Yick

Karl K Yick

Namvar Kiaie

Oswald Correya

John C Federkins

An acquisition module for acquiring signal timing in a CDMA system has a register for storing and organizing synchronization code, at least 4 match filters for match filtering between I/Q samples and the corresponding synchronization code, at least 4 absolute value blocks for determining absolute values of match filtering results, a summation function for summing results obtained through match filtering and through absolute value taking, and a control logic for controlling the acquisition process, characterized in that the acquisition module loads a 64-bit section of synchronization code and I/Q complex samples and match filters them in a simultaneous manner and, upon registering a value greater than a preset threshold, acquires an initial timing, the initial timing being verified over the remaining 64-bit sections of synchronization code using the same control circuitry used in acquiring the timing.

Fast acquisition module for a code division multiple access (CDMA) wireless local loop (WLL) system

A Time Division Duplex (TDD) wireless system utilizes an identical TDD IC engine in both base station and remote stations. In the base station the clock input to the TDD IC is halted once in the middle of each time slice to provide a central guard band between transmit and receive portions that determines the maximum range of the system. At the remote stations clock halts are programmed and utilized to provide guard bands to position transmit and receive portions in each time slice to accommodate propagation delay based on separation of a remote station from the base station. In a preferred embodiment the remote stations determine range to the base and a controller programs clock halts based on the range finding. In one aspect a TDD IC engine is used with a minimum fixed central guard band and a time slice of a first duration at a first clock frequency. Clock frequency is increased and the clock halted to provide increased range at the same time slice duration. The same IC engine at the remote stations is operated at the higher frequency and clock halts used to provide the same time slice duration of the base station and to space the transmit and receive portions of the time slice properly to accommodate propagation delay.

Method and apparatus for adapting a time division duplex timing device

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San Francisco, CA, United States of America

Ronald Ross