LDPC coded OFDM with Alamouti/SVD diversity technique

Abstract

Two transmit two receive space-time processing with LDPC coding is evaluated for OFDM transmission. The two methods for space-time processing are Alamouti's combining and the SVD technique. The channel estimates are calculated and provided to the diversity combiner, the SVD filters and LDPC decoder. Noise variance estimates are provided to the LDPC decoder. Using the proposed scheme we can obtain a BER of 10(-5) at an SNR of 2.6 dB with spectral efficiency of 0.4 bits/sec/Hz and 14.5 dB with a spectral efficiency of 4.2 bits/sec/Hz.