Method and apparatus for increasing the data rate for a given symbol rate in a spread spectrum system
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United States of America Patent
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Nov 5, 1991
Grant Date -
N/A
app pub date -
Dec 27, 1989
filing date -
Dec 27, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for transmitting a stream of data bits in a spread spectrum format is disclosed. The inventive method comprises providing 2.sup.N predetermined spreading sequences, where N is equal to or larger than 2. The predetermined spreading sequences have suitable autocorrelation and cross-correlation properties. For each group of N bits in a stream of data bits to be transmitted, a particular one from the 2.sup.N predetermined spreading sequences is selected and transmitted. In this manner, each transmitted spreading sequence corresponds to a particular arrangement of N bits. The invention achieves an N-fold increase in data rate for a particular symbol rate by encoding N bits in a spreading sequence.
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