Multilayered Space-Frequency Block Coded OFDM Systems

In this paper, we propose a multilayered spacefrequency block coded OFDM system, which is a combination of the vertical layered space-time architecture, known as V-BLAST, and the space-frequency block coded OFDM system. This system is designed to provide reliable as well as very high data rate communications over frequency-selective fading channels with low decoding complexity. Orthogonal Frequency Division Multiplexing (OFDM) is used to transform the frequencyselective fading channel into multiple flat fading sub-channels. Using four transmit and receive antennas at a data rate of 4 Bits/Sec/Hz, we achieve a diversity gain of about 4.5 dB over the conventional layered space-frequency coded OFDM structures (VBLAST-OFDM) at a bit error rate of 10 . 3 −