Electrical and Computer Engineering
2332 Main Mall
Vancouver,
BC
Canada
V6T 1Z4
Tel +1.604.822.2872
Fax +1.604.822.5949
Email:
info@ece.ubc.ca
| Title | Generalized Cyclic Delay Diversity for Orthogonal Frequency Division Multiplexing |
| Publication Type | Conference Paper |
| Year of Publication | 2007 |
| Authors | Chen, H. Z. B., R. Schober, and L. Lampe |
| Conference Name | Vehicular Technology Conference, 2007. VTC-2007 Fall. 2007 IEEE 66th |
| Pagination | 526 -530 |
| Date Published | sep. |
| Keywords | BICM, bit-interleaved coded modulation, CDD, cyclic delay diversity, delays, modulation coding, OFDM, OFDM modulation, optimum filters, orthogonal frequency division multiplexing |
| Abstract | 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. |
| URL | http://dx.doi.org/10.1109/VETECF.2007.121 |
| DOI | 10.1109/VETECF.2007.121 |