Title: On the Diversity Order of BICM-OFDM in Doubly Selective Fading Channels
Authors: Lin, Hsin-De
Sang, Tzu-Hsien
Department of Electronics Engineering and Institute of Electronics
Keywords: Bit-interleaved coded modulation (BICM);diversity order;doubly selective fading channel;orthogonal frequency-division multiplexing (OFDM)
Issue Date: 1-May-2013
Abstract: Bit-interleaved coded modulation with orthogonal frequency-division multiplexing (BICM-OFDM) is an attractive approach to achieve time and frequency diversity. Remarkable diversity gain can be obtained when the channel is doubly selective fading. In this paper, the asymptotic diversity orders of BICM-OFDM systems in doubly selective fading channels for both single-input-single-output (SISO) and multiple-input-multiple-output (MIMO) cases are derived. In addition, the system bit-error-rate (BER) behavior in practical situations with moderate signal-to-noise ratios (SNRs) is also investigated. In the SISO case, the diversity order depends on the rank of the channel correlation matrix. Therefore, the channel variations induced by fast fading contribute to improving diversity. In the MIMO case, the diversity order can be further increased when factors such as cyclic delays or phase rolls are introduced. Simulations are provided to verify the analysis.
URI: http://dx.doi.org/10.1109/TVT.2012.2235091
ISSN: 0018-9545
DOI: 10.1109/TVT.2012.2235091
Volume: 62
Issue: 4
Begin Page: 1866
End Page: 1871
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