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Multicode spread spectrum communications system

DC
  • US 6,192,068 B1
  • Filed: 10/03/1996
  • Issued: 02/20/2001
  • Est. Priority Date: 10/03/1996
  • Status: Expired due to Term
First Claim
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1. A transceiver for transmitting a first stream of data symbols, the transceiver comprising:

  • a first converter for converting the first stream of data symbols into plural sets of B data symbols each;

    a channel encoder/modulator for encoding plural sets of B data symbols into plural sets of J modulated symbols;

    a spreader for spreading plural sets of J modulated symbols into plural sets of M multicoded SS symbols; and

    a second converter for converting the plural sets of M multicoded SS symbols into a first stream of multicoded SS symbols for transmission, wherein the spreader includes;

    a third converter for converting each one of the plural sets of J modulated symbols into M subsets of modulated symbols;

    a transformer for operating on the M subsets of modulated symbols to generate M multicoded SS symbols as output, the M multicoded SS symbols corresponding to spreading each subset of modulated symbol over a separate spread spectrum symbol and combining the M spread spectrum symbols;

    means for receiving a sequence of multicoded SS symbols, the multicoded SS symbols having been generated by spreading a second stream of data symbols, wherein the third converter converts the received stream of multicoded SS symbols into plural sets of M multicoded SS symbols each;

    a despreader for despreading plural sets of M multicoded SS symbols to produce plural sets of J despread symbols in which the despreader includes;

    a non trivial inverse transformer for inverse transforming M multicoded SS symbol from the received sequence of multicoded SS symbols into M transformed symbols; and

    a detector for operating on the M transformed symbols to produce J despread symbols;

    a channel decoder/demodulator for decoding plural sets of J despread symbols into plural sets of B estimated data symbols of the second stream of data symbols; and

    a fourth converter for converting the plural sets of the B estimated data symbols into a stream of estimated data symbols of the second stream of data symbols.

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