Title :
Robust adaptive detection in linearly precoded MIMO-OFDM systems with hard/soft decoding
Author :
Riera-Palou, Felip ; Femenias, Guillem
Author_Institution :
Dept. of Math. & Inf., Univ. of the Balearic Islands, Palma de Mallorca, Spain
Abstract :
Maximum likelihood detection (MLD) has been shown to offer large performance gains within the context of linearly precoded MIMO-OFDM systems with multiple-stream transmission when compared to an all-linear setup (i.e., linear transmitter/receiver), although at the cost of a higher computational complexity. To overcome this handicap, this paper proposes a method to selectively choose the detection strategy (ML or linear) as a function of the instantaneous channel conditions and the accuracy of the channel state information at the transmitter (CSIT). The proposed technique is suitable for both hard- and soft-decoded setups. Numerical results show that a cautious and selective use of ML detection substantially reduces complexity while still reaping most of the performance advantage.
Keywords :
MIMO communication; OFDM modulation; computational complexity; maximum likelihood detection; precoding; CSIT; ML detection; MLD; all-linear setup; channel state information-transmitter; computational complexity; detection strategy; hard-soft decoding; instantaneous channel condition; linear transmitter-receiver; linearly precoded MIMO-OFDM systems; maximum likelihood detection; multiple-stream transmission; robust adaptive detection; Accuracy; Complexity theory; Decoding; Detectors; OFDM; Receivers; Transmitters; MIMO-OFDM; Precoding; imperfect CSIT; maximum likelihood detection;
Conference_Titel :
Wireless and Mobile Computing, Networking and Communications (WiMob), 2012 IEEE 8th International Conference on
Conference_Location :
Barcelona
Print_ISBN :
978-1-4673-1429-9
DOI :
10.1109/WiMOB.2012.6379127