Robust CDMA signal detection in the presence of user andinterference signature mismatch
Shuguang Cui; Zhi-Quan Luo; Zhi Ding
Wireless Communications, 2001. (SPAWC apos;01). 2001 IEEE Third Workshop on Signal Processing Advances in
Volume , Issue , 2001 Page(s):221 - 224
Digital Object Identifier 10.1109/SPAWC.2001.923887
Summary:Signal detection in multiuser CDMA systems is particularly
attractive when the desired user signature and some interferer
signatures are known and are not completely orthogonal at the receiver.
As many multiuser systems must deal with the near-far problem, a
weakness common to several known blind multiuser CDMA detectors is that
the detection performance is very sensitive to signature waveform
mismatch (SWM) which occurs a result of channel distortion. We consider
the design of a partially blind multiuser CDMA detector that is robust
to the SWM. We present a convex formulation of this problem by using
second-order cone programming (SOCP). The resulting SOCP can be solved
efficiently using the recently developed interior point methods.
Computer simulations indicate that the performance of our new robust
multiuser detector is superior to the one that does not utilize the
interference information
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