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Efficient Space-Time Block Codes Derived from Quasi-Orthogonal Structures

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2 Author(s)
Janani, M. ; Dept. of Electr. Eng., Texas Univ., Richardson, TX ; Nosratinia, A.

We propose a new class of block codes that outperforms known space-time block codes at low rates. The new codes are designed by using appropriate rotations and set partitioning on two quasi-orthogonal codes, and combining subsets of their codewords. Using these techniques we are able to obtain higher coding gain at a given rate and improve performance. Simulations confirm the advantages of this code compared to other codes operating at the same rate and signal-to-noise ratio (SNR). We also provide an efficient maximum likelihood (ML) decoding algorithm for the new code

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Wireless Communications, IEEE Transactions on  (Volume:6 ,  Issue: 5 )