Cyclic Delay Diversity with discrete-Hartley-fourier transform in OFDM system

Cyclic Delay Diversity (CDD) is a simple approach to provide spatial diversity for Orthogonal Frequency Division Multiplexing (OFDM) system. CDD provides not only the multipath diversity without channel coding but also a sample receiver structure. Discrete Hartley transform (DHT) as a linear precoding based OFDM outperforms the OFDM based on discrete Fourier transform (DFT) for it intrinsic frequency diversity. In this paper a simple scheme that DHFT-OFDM system with spatial multipath diversity by using CDD technique in the frequency selective fading channel is proposed. Simulation results are provided to validate the advantages of the proposed scheme that combining CDD with DHFT-OFDM system.