Generalized Cyclic Delay Diversity for Orthogonal Frequency Division Multiplexing

TitleGeneralized Cyclic Delay Diversity for Orthogonal Frequency Division Multiplexing
Publication TypeConference Paper
Year of Publication2007
AuthorsChen, H. Z. B., R. Schober, and L. Lampe
Conference NameVehicular Technology Conference, 2007. VTC-2007 Fall. 2007 IEEE 66th
Pagination526 -530
Date Publishedsep.
KeywordsBICM, bit-interleaved coded modulation, CDD, cyclic delay diversity, delays, modulation coding, OFDM, OFDM modulation, optimum filters, orthogonal frequency division multiplexing

In this paper, we propose a generalized version of cyclic delay diversity (CDD) which is a popular form of space-frequency coding for multi-antenna orthogonal frequency division multiplexing (OFDM) systems. In this generalized CDD (GCDD) the cyclic delays of CDD are replaced with cyclic diversity filters. Assuming bit-interleaved coded modulation (BICM) for forward error correction, we derive an optimization criterion for the GCDD filters and a gradient algorithm for finding the optimum filters. For certain special cases we also provide a closed-form solution for the optimum filters. Simulation results confirm that GCDD can achieve significant performance gains for conventional CDD, especially in spatially correlated fading.


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