Enhancing CDMA multiuser detection by constraining soft decisions
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United States of America Patent
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Jan 9, 2007
Grant Date -
May 27, 2004
app pub date -
Nov 27, 2002
filing date -
Nov 27, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for multi-user detection includes receiving a complex input signal due to a superposition of waveforms encoding symbols in a constellation of fixed magnitude and variable phase, which symbols are transmitted respectively by a plurality of transmitters in a common frequency band. The complex input signal is sampled at sampling intervals over the duration of an observation period to provide a sequence of complex samples. The sequence of complex samples is processed to determine soft decision values corresponding to the symbols transmitted by the plurality of the transmitters in the observation period, while constraining the soft decision values to a circle in a complex plane. The soft decision values are projected onto the constellation to estimate the transmitted symbols.
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