Generalised prefix for space–time block-coded orthogonal frequency division multiplexing wireless systems over correlated multiple-input multiple-output channels
The Institution of Engineering and Technology
Place of Publication
Space–time block coding (STBC) orthogonal frequency division multiplexing (OFDM) is known to improve the reliability of broadband communication over wireless links. However, this technique suffers from a performance loss when the multiple-input multiple-output (MIMO) channel is correlated. This study addresses this problem. A STBC-OFDM system is proposed that is based on convolution that is skew-circular, rather than circular. This skew-circular convolution leads to one additional degree of freedom. The additional parameter can be optimised leading to improved performance for MIMO channels that are correlated. The skew-circular convolution is achieved via the introduction of a generalised prefix. The simulation results are given, illustrating the performance improvement of the proposed STBC-OFDM system. Furthermore, the proposed system is shown to be robust when channel state information is known not precisely, but imperfectly.
OFDM modulation, wireless channels, space-time block codes, telecommunication network reliability, channel coding, radio links, MIMO communication
Hakan Yıldız, Yusuf Acar, Todor Cooklev, and Hakan Dogan (2014).
Generalised prefix for space–time block-coded orthogonal frequency division multiplexing wireless systems over correlated multiple-input multiple-output channels. IET Communications.8 (9), 1589-1598. United Kingdom: The Institution of Engineering and Technology.