Robust digital modulation and demodulation scheme for radio communications involving fading
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United States of America Patent
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Feb 26, 2002
Grant Date -
N/A
app pub date -
Nov 19, 1998
filing date -
Nov 20, 1997
priority date (Note) -
Expired
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Abstract
A digital modulation and demodulation scheme for radio communications which is capable of reducing errors due to fading while maintaining the characteristic of the M-ary modulation and demodulation scheme that it is robust against interferences. At the transmitting side, transmission data are divided in advance into blocks of LN bits length each and each block is divided into N sets of L bits data sequences. Then, orthogonal codes of M bits length each corresponding to L bits codes given by the L bits data sequences are generated, and N sets of orthogonal codes for each block are multiplexed into a multiplexed signal, such that M bits constituting each orthogonal code are dispersed in time in the multiplexed signal. A digital modulation is then applied to a carrier using the multiplexed signal.
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