Computer Science – Information Theory
Scientific paper
2011-09-16
Computer Science
Information Theory
submitted to conference
Scientific paper
Beamforming techniques employing Singular Value Decomposition (SVD) are commonly used in Multi-Input Multi-Output (MIMO) wireless communication systems. For frequency selective channels, Bit-Interleaved Coded Multiple Beamforming with Orthogonal Frequency Division Multiplexing (BICMB-OFDM) can be applied to achieve both spatial diversity and multipath diversity. However, the diversity analysis of BICMB-OFDM is a challenging problem because of its complicated system structure. In this paper, the diversity of BICMB-OFDM is investigated with the consideration of the correlation among subcarrier channels. Based on the analysis, the maximum achievable diversity is derived. Then, a full diversity condition RcSL<=1 is proved, where Rc, S, and L are the code rate, the number of parallel streams, and the number of channel taps, respectively. However, with correlation, the actual diversity is degraded compared to its maximum achievable value. Therefore, two strategies are discussed to combat the diversity degradation.
Ayanoglu Ender
Li Boyu
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