Maximizing data rate by adjusting codes and code rates in CDMA system
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United States of America Patent
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Dec 6, 2005
Grant Date -
Dec 6, 2001
app pub date -
Jan 31, 2001
filing date -
Mar 5, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention provides for making code rate adjustments and modulation type adjustments in a pseudonoise (PN) encoded CDMA system. Coding rate adjustments may be made by changing the number of information bits per symbol, or Forward Error Code (FEC) coding rate. A forward error correction (FEC) block size is maintained at a constant amount. Therefore, as the number of information bits per symbol are increased, an integer multiple of bits per epoch is always maintained. The scheme permits for a greater flexibility and selection of effective data rates providing information bit rates ranging from, for example, approximately 50 kilobits per second to over 5 mega bits per second (Mbps) in one preferred embodiment.
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