Ikanos Communications, Inc.

Carlson Wireless, Inc.

Karl Yick

Julien D Pons

Qasem Aldrubi

Christopher Flores

Siva Simanapalli

Hossein Dehghan-Fard

Ronald Ross

Oswald Correya

Arnaud Charton

A multi-tone transceiver with a components forming a transmit path and a receive path configured to couple via a subscriber line to an opposing multi-tone transceiver for frequency division multiplexed multi-tone modulated communications therewith is disclosed. A noise margin channel identifier is configured to identify within a received tone set, discrete tones each associated with a corresponding one of at least two channels differing from one another in a relative noise margin of associated tones. A Viterbi decoder is responsive to the channel identification provided by the noise margin channel identifier to discretely decode each of the at least two channels; thereby improving the fidelity of the error correction provided by the Viterbi decoder by discretely processing the identified channels within the received set of tones.

Method and apparatus for forward error correction

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

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Alameda, CA, United States of America

Karl Yick