Performance evaluation of CDMA adaptive interference canceller with RAKE structure using developed testbed in multiuser and multipath fading environment

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^-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