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Efficient detection algorithm for 2Nx2N MIMO systems using alamouti code and QR decomposition

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2 Author(s)
Arar, M. ; Sch. of Inf. Technol. & Eng., Ottawa Univ., Ont. ; Yongacoglu, A.

We propose an efficient 2Ntimes2N MIMO detection algorithm where the transmit signals are grouped in pairs and separately coded using the standard Alamouti space-time code. At the receiver, one or more QR decompositions are performed and the upper triangular property of the R matrices so obtained is exploited in order to successively decode the transmitted symbols starting with those interference-free symbols corresponding to the last two rows and columns of R. Bit-error-rate simulation results, for a 4times4 MIMO system and a bandwidth efficiency of 8 bits/s/Hz, show that the proposed technique, while less complex than ordered MMSE V-BLAST, outperforms the latter by 2-6 dB at a BER of 10-4

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Communications Letters, IEEE  (Volume:10 ,  Issue: 12 )