Abstract: As a method for eliminating m
ultiple access interference (MAI) in CDMA, blind space-time multiuser detection
based on the Kalman filter will face the problem of numeric stability when used
in 16bits or 32bits microprocessor or DSP. So a high performance blind spac
e-time multiuser detection algorithm is proposed by introducing the U-D factor
Kalman filter to estimate the optimal decision vector of the CDMA multiple-use
r
s receiver. This algorithm can converge rapidly, track in high accuracy and has
satisfied numeric stability. Simulation results show that this algorithm can eli
minate multiple access interference (MAI) efficiently and is robust to numerical
calculation.

Key words: code-division multiple-access(CDMA), multiple access interference(MAI), blind space-time multiuser detection, U-D factor Kalman filter