A Steady State Decoupled Kalman Filter Technique for Multiuser Detection
September 2003
Brian P. Flanagan, The MITRE Corporation
James Dunyak, The MITRE Corporation
ABSTRACT
In this paper, we describe a Kalman filter based technique
for multiuser detection of asynchronous CDMA systems.
Similar to previously proposed techniques, we use a
decoupled form of the Kalman filter which processes each
user independently. We then make the further simplifying
assumption that the channel statistics are constant over a
single symbol allowing us to reduce the kalman gain to
a constant dependent on the current signal to interference
plus noise ratio. We study the performance of the constant
gain filter and show that by appropriate choice of the gain
you can optimize for either minimum bit error rate or maximum
interference reduction.
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