Performance of the RAKE receiver under imperfect channel estimation in a DS- CDMA system
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This paper presents the bit-error rate (BER) performance of the RAKE receiver over a multipath Rayleigh fading channel. The closed-form solution for BER is obtained through the analysis of the imperfect channel estimation. We compute the BER as a function of bit energy-to-noise ratio (Eb / N0), channel and system parameters : number of diversity channels L=1, 3 ; Doppler frequency shift with fDT=0.008333, 0.0167, 0.025 ; residual carrier frequency offset Df=-600 ~ 600Hz ; average length of the channel estimator Np=128~1536 chips. This analysis allows predicting the system's performance and helps to optimize the parameter setting for the channel estimation process. We show that even under the optimal environment, the BER performance results in a minimal 1.5dB degradation in comparison to the perfect channel estimation. Finally, theoretical results are verified by using the Monte-Carlo computer simulations.
Abstract
This paper presents the bit-error rate (BER) performance of the RAKE receiver over a multipath Rayleigh fading channel. The closed-form solution for BER is obtained through the analysis of the imperfect channel estimation. We compute the BER as a function of bit energy-to-noise ratio (Eb / N0), channel and system parameters : number of diversity channels L=1, 3 ; Doppler frequency shift with fDT=0.008333, 0.0167, 0.025 ; residual carrier frequency offset Df=-600 ~ 600Hz ; average length of the channel estimator Np=128~1536 chips. This analysis allows predicting the system's performance and helps to optimize the parameter setting for the channel estimation process. We show that even under the optimal environment, the BER performance results in a minimal 1.5dB degradation in comparison to the perfect channel estimation. Finally, theoretical results are verified by using the Monte-Carlo computer simulations.