US 2003/0152176 A1 · Method and system for joint decision feedback equalization and complementary code key decoding using a trellis

Abstract

A method and system for performing joint equalization and decoding of Complementary Code Key (CCK) encoded symbols. The system comprises: a decision feedback equalizer (DFE) structure for simulating an inverse communications channel response and providing an output comprising an estimation of the received symbols, the DFE structure including a forward equalizer path and a feedback equalizer path including a feedback filter; and, a CCK decoder embedded in the feedback path and operating in conjunction with a feedback filter therein for decoding the chips based on intermediate DFE outputs including those chips corresponding to past decoded CCK symbols. Decisions on a symbol chip at a particular time are not made until an entire CCK codeword that the chip belongs to is decoded, thereby reducing errors propagated when decoding the symbols. Advantageously, the trellis decoding method is implemented as a computationally efficient 64-state trellis.

Claims27

Dependent claims

In a communications system including a receiver device for receiving symbols communicated via a communications channel and encoded according to a Complementary Code Key (CCK) chip encoding scheme, a system for decoding received CCK encoded symbols (chips), said system comprising:

a decision feedback equalizer (DFE) structure for receiving and equalizing CCK-encoded symbols communicated over a communications channel, and providing an output comprising an estimation of said received symbols, said DFE structure including a forward equalizer path and a feedback equalizer path including a feedback filter;
a CCK decoder means embedded in said feedback path and operating in conjunction with a feedback filter therein for decoding said chips, said decoding of CCK chips being based on intermediate DFE outputs including those chips corresponding to past decoded CCK symbols,
wherein decisions on a symbol chip at a particular time are not made until an entire CCK codeword that the chip belongs to is decoded, thereby reducing errors propagated when decoding said symbols.

A method for decoding symbols encoded according to a Complementary Code Key (CCK) chip encoding scheme, said method comprising the steps of:

a) providing a decision feedback equalizer (DFE) structure for receiving and equalizing CCK-encoded symbols (chips) communicated over a communications channel, said DFE structure further estimating said received symbols for DFE output, said DFE structure including a forward equalizer path and a feedback equalizer path including a feedback filter;
b) embedding a CCK decoder means in said feedback path for decoding said chips in conjunction with filter taps of determined for said feedback filter;
and,
c) decoding of said CCK chips based on intermediate DFE outputs including those chips corresponding to past decoded CCK symbols,
wherein decisions on a symbol chip at a particular time are not made until an entire CCK codeword that the chip belongs to is decoded, thereby reducing errors propagated when decoding said symbols.

2 more elements

A receiver device for receiving symbols communicated via a communications channel, said symbols encoded according to a Complementary Code Key (CCK) chip encoding scheme, said receiver device comprising:

a decision feedback equalizer (DFE) structure for receiving and equalizing CCK-encoded symbols (chips) communicated over a communications channel, and providing an output comprising an estimation of said received symbols, said DFE structure including a forward equalizer path and a feedback equalizer path including a feedback filter;
a CCK decoder means embedded in said feedback path and operating in conjunction with a feedback filter therein for decoding said chips, said decoding of CCK chips being based on intermediate DFE outputs including those chips corresponding to past decoded CCK symbols,
wherein decisions on a symbol chip at a particular time are not made until an entire CCK codeword that the chip belongs to is decoded, thereby reducing errors propagated when decoding said symbols.

Dependencies are inferred from the claim text.

Method and system for joint decision feedback equalization and complementary code key decoding using a trellis

Life of this patent

Method and system for joint decision feedback equalization and complementary code key decoding using a trellis

Life of this patent

Abstract

Claims27