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Apparatus and method for digital data transmission using orthogonal cyclic codes

  • US 5,966,376 A
  • Filed: 10/23/1995
  • Issued: 10/12/1999
  • Est. Priority Date: 08/25/1995
  • Status: Expired due to Term
First Claim
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1. A transmitter for a code division multiplexed system, comprising:

  • a framer circuit to receive input data and rearrange said input data into a plurality of subgroups of bits for encoding;

    an encoder coupled to receive each subgroup and having circuitry and a state memory to analyze each subgroup of bits and the previous states to add one or more redundant bits to each subgroup to generate symbol elements referred to as chips;

    a memory to receive said datas and store them in groups as a plurality of symbols, said plurality of symbols defining an information vector;

    a code division multiplexer having circuitry coupled to said memory to multiply each information vector stored In said memory times the orthogonal spreading codes in an orthogonal code matrix to generate a result vector of spread spectrum chip data for each information vector; and

    a modulator for modulating the spread spectrum chip data of each said result vector onto one or more radio frequency carriers.

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