Performance Analysis of 2-D-RAKE Receivers with Imperfect Channel Estimation in Nakagami Fading Channels

In this paper, the closed-form expressions of signal-to-interference-plus-noise ratio (SINR) and the bit error rate (BER) are derived for a maximal ratio combining (MRC) two-dimensional (2-D)-RAKE receiver with imperfect channel estimation in frequency-selective Nakagami fading channels. The impact of Doppler frequency shift, the low pass filters (LPF) and the spatial-temporal diversity on the channel estimation and the performance of the receiver has been analyzed. Theoretical analysis and computer simulation results indicate that the performance degradation of 2-D-RAKE receivers due to imperfect channel estimation can be improved by using appropriate LPF taps and increasing the antenna numbers.