Performance evaluation of CDMA adaptive interference canceller with RAKE structure using developed testbed in multiuser and multipath fading environment
Hiroyuki Mizuguchi, S. Yoshida, A. Ushirokawa · 2002
We describe the implementation of the proposed single user type CDMA adaptive interference canceller (AIC) with RAKE structure in a base station testbed, and evaluate its performance in the multiuser and multipath fading environment. Laboratory experiments demonstrate that the AIC receiver is much more near-far resistant than a conventional matched filter (MF) receiver in the multiuser case. When the power of the other users is 6 dB larger than that of the desired user, the AIC receiver can achieve a BER of 10/sup -3/ at C/PG=33.3% (eight users) in the 2-path fading channel, while the MF receiver cannot achieve the BER at C/PG of more than 20.8% (five users), it can achieve the BER at C/PG=33.3% in the equal power case. Furthermore, we evaluate the effect of transmission power reduction in a mobile station with transmission power control (TPC). Experimental results show that the required transmission power can be greatly reduced by 3.0 dB and 9.2 dB with the AIC receiver at C/PG=29.2% (seven users) and 33.3% (eight users), respectively.