CDMA multi-user detection with a real symbol constellation
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United States of America Patent
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Apr 25, 2006
Grant Date -
Aug 1, 2002
app pub date -
Jul 31, 2001
filing date -
Dec 8, 2000
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 real-valued constellation, which 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 be real values. The soft decision values are then projected onto the constellation to estimate the transmitted symbols.
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