Experiments on Parallel-Type Coherent Multistage Interference Canceller with Iterative Channel Estimation for W-CDMA Mobile Radio(special Section on Spread Spectrum Techniques and Applications)

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This paper investigates the interference suppression effect from much higher rate dedicated physical channels(DPCHs)of a parallel-type coherent multistage interference canceller(COMSIC)with iterative channel estimation(ICE)by laboratory experiments in the transmit-power-controlled W-CDMA reverse link. The experimental results elucidate that when two interfering DPCHs exist with the spreading factor(SF)of 8 and with the ratio of the target signal energy per bit-to-interference power spectrum density ratio(E_b/I_o)of fast transmit power control, Δ_<E_b/I_o> of -6dB(which corresponds to 64 simultaneous DPCHs with SF =64, i. e. , the same symbol rate as the desired DPCH), the implemented COMSIC receiver with ICE exhibits a significant decrease in the required transmit signal energy per bit-to-background noise power spectrum density ratio(E_b/N_o)at the average bit error rate(BER)of 10^<-3>(while the matched filter(MF)-based Rake receiver could not realize the average BER of 10^<-3> due to severe multiple access interference(MAI)). It is also found that the achieved BER performance at the average BER of 10^<-3> of the COMSIC receiver with the A/D converter quantization of 8 bits in the laboratory experiments is degraded by approximately 1.0dB and 4.0dB compared to the computer simulation results, when Δ_<E_b/I_o>= -6dB and -9dB, respectively, due to the quantization error of the desired signal and path search error for the Rake combiner. Finally, we show that the required transmit E_b/N_o at the average BER of lou of the third-stage COMSIC with ICE is decreased by approximately 0.3 and 0.5dB compared to that of COMSIC with decision-feedback type channel estimation(DFCE)with and without antenna diversity reception, respectively.
社団法人電子情報通信学会の論文
2001-12-01

Experiments on Parallel-Type Coherent Multistage Interference Canceller with Iterative Channel Estimation for W-CDMA Mobile Radio(special Section on Spread Spectrum Techniques and Applications)

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