Spread spectrum transceiver for use in wireless local area network and having multipath mitigation

A method of demodulating a spread spectrum signal comprising the steps of:

• receiving within a demodulator of a spread spectrum receiver a spread spectrum phase shift keyed (PSK) modulated information signal on a signal channel;
• Viterbi decoding a precursor portion of the information signal and providing a traceback soft decision signal;
• feedback equalizing a post-cursor portion of the information signal;
• and
• spread spectrum despreading the traceback soft decision signal within a spread spectrum code function correlator.

A spread spectrum radio transceiver comprising:

• a baseband processor and radio circuit connected thereto, said baseband processor comprising,
• a demodulator for spread spectrum phase shift keying (PSK) demodulating an information signal on a signal channel, wherein said information signal includes data symbols formed from a plurality of high rate mode chips forming a spread spectrum information signal, said demodulator comprising
• a Viterbi decoder that receives the information signal and decodes a precursor portion of the information signal and that provides a corresponding trace back soft decision signal;
• at least one spread spectrum code function correlator for decoding said trace back soft decision signal according to a predetermined spreading code sequence;
• a carrier loop circuit for phase and frequency tracking the information signal;
• a chip decision circuit operative with the carrier tracking loop for tracking high rate chips;
• a decision feedback equalizer formed from a finite impulse response filter operative with the chip decision circuit and carrier loop circuit, and having a plurality of feedback taps, wherein at least one feedback tap is selected for logical add/subtract operations for equalizing a post-cursor portion of the information signal;
• and
• a modulator for spread spectrum PSK modulating information for transmission via the radio circuit, said modulator comprising at least one code function encoder for encoding information according to an orthogonal code sequence.

A spread spectrum radio transceiver comprising:

• a baseband processor and a radio circuit connected thereto, said baseband processor comprising
• a demodulator for spread spectrum phase shift keying (PSK) demodulating an information signal on a signal channel, wherein said information signal includes data symbols formed from a plurality of high rate mode chips forming a spread spectrum information signal, said demodulator comprising,
• a Viterbi decoder that receives the information signal and decodes a precursor portion thereof, and generates a traceback soft decision signal;
• at least one said spread spectrum code function correlator for decoding said traceback soft decision signal of the information signal according to a predetermined spreading code sequence;
• a decision feedback equalizer operative with said Viterbi decoder for equalizing a post-cursor portion of the information signal;
• and
• a modulator for spread spectrum PSK modulating information for transmission via the radio circuit, said modulator comprising at least one code function encoder for encoding information according to a spreading code sequence.

A demodulator for a spread spectrum radio transceiver, said demodulator comprising:

• a demodulator circuit for spread spectrum phase shift keying (PSK) demodulating an information signal on a signal channel, wherein said information signal includes data symbols formed from a plurality of high rate mode chips forming a spread spectrum information signal, said demodulator comprising
• a Viterbi decoder that receives the information signal and decodes a precursor portion of the information signal;
• at least one spread spectrum code function correlator for decoding said precursor portion of the information signal according to a predetermined spreading code sequence;
• a carrier loop circuit for phase and frequency tracking the information signal;
• a chip decision circuit operative with the carrier loop circuit for tracking high rate chips;
• a decision feedback equalizer formed from a finite impulse response filter operative with the chip decision circuit and carrier loop circuit, and having a plurality of feedback taps, wherein at least one feedback tap is selected for logical add/subtract operations for equalizing a post-cursor portion of the information signal.

A demodulator for a spread spectrum radio transceiver, said demodulator comprising:

• a demodulator circuit for spread spectrum phase shift keying (PSK) demodulating an information signal on a signal channel, wherein said information signal includes data symbols formed from a plurality of high rate mode chips forming a spread spectrum information signal, said demodulator comprising
• a Viterbi decoder that receives the information signal and decodes a precursor portion of the information signal and generates a traceback soft decision signal;
• at least one spread spectrum code function correlator for decoding said traceback soft decision signal according to a predetermined spreading code sequence;
• a decision feedback equalizer operative with said Viterbi decoder for equalizing a post-cursor portion of the signal channel.