Multiple output selection-LAS algorithm in large MIMO systems

• Published in: IEEE communications letters Vol. 14; no. 5; pp. 399 - 401
• Main Authors: Li, Peng, Murch, Ross D.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.05.2010; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Antennas; Applied sciences; Ascent; Bit error rate; Computer simulation; Detectors; Exact sciences and technology; Information, signal and communications theory; Large MIMO systems; likelihood ascent search (LAS); low-complexity detection; Mathematical models; Maximum likelihood detection; Maximum likelihood estimation; MIMO; Modulation, demodulation; Noise levels; Quadrature phase shift keying; Radiocommunications; Receivers; Receiving antennas; Searching; Signal and communications theory; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Transmitters; Transmitters. Receivers; Transmitting antennas; Performance evaluation; MIMO system; maximum likelihood detection; likelihood ascent search (LAS); Quadrature amplitude modulation; Computer simulation; Bit error rate; Transmitter; low-complexity detection; Search algorithm; Maximum likelihood; Large MIMO systems; Antenna; Signal to noise ratio; Large scale system
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/LCOMM.2010.05.100092

We present a low-complexity algorithm for detection in large MIMO systems based on the likelihood ascent search (LAS) algorithm. The key idea in our work is to generate multiple possible solutions or outputs from which we select the best one. We propose two possible approaches to achieve this goal and both are investigated. Computer simulations demonstrate that the proposed algorithm, Multiple Output Selection-LAS, which has the same complexity order as that of conventional LAS algorithms, is superior in bit error rate (BER) performance to LAS conventional algorithms. For example, with 20 antennas at both the transmitter and receiver, the proposed MOS-LAS algorithm needs about 4 dB less SNR to achieve a target BER of 10 -4 for 4-QAM.