Method and apparatus to implement antenna diversity for direct sequence spread spectrum receivers
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United States of America Patent
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Sep 7, 1999
Issued Date -
N/A
app pub date -
Aug 21, 1997
filing date -
Nov 13, 1995
priority date (Note) -
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Abstract
An invention for providing diversity for direct sequence spread spectrum wireless communication systems is presented. The invention provides a receiver technique in which M antennas are utilized at the receiver. Distinct weighting signals are applied to information signals received at each of the M antennas, with the weighing signals being, for example, distinct changes in either phase or amplitude. Applying weighing signals to each of the information signals received at the M receiver antennas results in constructive addition of derived signal vectors at predetermined intervals, which eliminates deep fading at the receiver. Each different time varying weighting signal is determined independently of the corresponding information signal and the combined received input signal.
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