Pilot-assisted Channel Estimation for Frequency-domain Equalization of DSSS Signals
Koichi Ishihara, Kazu TAKEDA, Fumiyuki Adachi · 2005
As the channel frequency selectivity becomes severer, the bit error rate (BER) performance of direct sequence spread spectrum (DSSS) with rake combining degrades due to increasing inter-path interference. Frequency-domain equalization (FDE) can replace rake combining with much improved BER performance in a severe frequency-selective fading channel. For FDE, accurate estimation of the channel transfer function is required. In this paper, we propose a pilot-assisted iterative channel estimation that uses a pilot which is time-multiplexed within each chip block for fast Fourier transform (FFT). The pilot acts as a cyclic-prefix of FFT block as well. The achievable BER performance is evaluated by computer simulation.