Abstract：By Spectrum Spreading, the multi-path signals can be distinguished and received by RAKE receiver, and spectrum spreading is an efficient way to overcome multi-path fading. Time spreading can implement RAKE diversity receiving in frequency domain. But time spreading comes with serious ISI in fading channels. Synchronous time spreading can overcome the ISI. By channel decomposing, the signal can be received by diversity receiver, so good performance can be achieved. To achieve 10-4 BER performance, the SNR required in time-varying fading channels by our algorithm with 1024 bit spreading length is only 1.4dB more than that in AWGN channels without diversity.
2005, Vol. 27 
