Transmit Diversity Schemes for MIMO-OFDM Based Wireless Lan Systems
Yan Jun Wu, Sumei Sun, Yuan Li, Ying‐Chang Liang · 2006
In this paper, we study the performance of two transmit diversity schemes, the cyclic delay diversity (CDD) and the groupwise space time block code (G-STBC), for high throughput wireless local area network (LAN) system using orthogonal frequency division multiplexing (OFDM) and multiple input multiple output (MIMO) technologies. We compare the performance of CDD and the G-STBC transmission with the VBLAST transmission using both convolutional code (CC) and low density parity check (LDPC) code. We show that G-STBC provides the best performance in all the three transmission schemes. The performance of CDD depends both on the frequency diversity of the channel and the power of coding. CDD has better performance advantage for systems with smaller multi-path and with powerful coding schemes. CDD also has the advantage of being receiver transparent