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Method of chip interleaving in direct sequence spread spectrum communications

  • US 6,061,386 A
  • Filed: 03/19/1997
  • Issued: 05/09/2000
  • Est. Priority Date: 03/19/1997
  • Status: Expired due to Fees
First Claim
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1. An improved method for transmitting a number M of data bits from a transmitter to a receiver, the method being of the type in which a plurality of chip frames are formed by multiplying each of the data bits by N of the chips of a pseudorandom binary interleaving code sequence, thereby producing a set of N product chips corresponding to each bit, and interleaving the product chips so that each chip frame includes a unique one of the product chips from each bit, the improvement comprising the steps of:

  • (a) selecting an integer Q;

    (b) selecting N to be one less than a power of two;

    (c) selecting M to be equal to an integer selected from the group of integers consisting of QN+1 and QN-1;

    (d) providing, at the transmitter and at the receiver, a pseudorandom binary interleaving code sequence, of N chips, selected from the group of sequences consisting of self-orthogonal sequences and approximately self-orthogonal sequences; and

    (e) multiplying, at the transmitter, each of the M data bits by each of said N chips of said pseudorandom binary interleaving code sequence, thereby producing a packet of N chip frames, said packet including NM product chips.

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