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Low-complexity sphere decoding algorithm for quasi-orthogonal space-time block codes

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3 Author(s)
A. Y. -C. Peng ; Dept. of Electr. & Comput. Eng., Queen's Univ., Kingston, Ont., Canada ; Il-Min Kim ; S. Yousefi

Space-time codes can be decoded by the sphere decoding (SD) algorithm to reduce the complexity and retain maximum-likelihood (ML) performance. In this letter, the ML metric of quasi-orthogonal space-time block codes is written into two independent Euclidean norms, thus SD can be applied to each function independently. The new scheme reduces the complexity by at least 85% for systems with four or more transmit antennas, compared with the conventional SD algorithm.

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IEEE Transactions on Communications  (Volume:54 ,  Issue: 3 )