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

• Published in: IEEE communications letters Vol. 10; no. 12; pp. 819 - 821
• Main Authors: Arar, M., Yongacoglu, A.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.12.2006; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Antennas and propagation; Applied sciences; Code standards; Coding, codes; Computer errors; Computer simulation; Decoding; Decomposition; Detection algorithms; Detection, estimation, filtering, equalization, prediction; Exact sciences and technology; Filtering; Information, signal and communications theory; Interference cancellation; Mathematical analysis; MIMO; Miscellaneous; Noise levels; Receivers; Signal and communications theory; Signal processing; Signal, noise; Silicon carbide; Space time codes; Symbols; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Performance evaluation; MIMO system; Space-time codes; Noise reduction; Bit error rate; QR decomposition; V-BLAST; Algorithm; Information transmission; Mean square error; successive interference cancellation; Interference suppression; Alamouti code; Algorithm performance; Simulation; QR factorization; Signal processing
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/LCOMM.2006.060953

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