DocumentCode :
1227626
Title :
Adaptive Frequency-Domain Channel Estimator in 4  ,\\times , 4 MIMO-OFDM Modems
Author :
Sun, Ming-Fu ; Juan, Ta-Yang ; Lin, Kan-Si ; Hsu, Terng-Yin
Author_Institution :
Dept. of Comput. Sci., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Volume :
17
Issue :
11
fYear :
2009
Firstpage :
1616
Lastpage :
1625
Abstract :
This work presents an adaptive frequency-domain channel estimator (FD-CE) for equalization of space-time block code multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems in time-varying frequency-selective fading. The proposed adaptive FD-CE ensures the channel estimation accuracy in each set of four MIMO-OFDM symbols. Performance evaluation shows that the proposed method achieved a 10% packet error rate of 64 quadrature amplitude modulation (QAM) at 29.5 dB SNR under 120 km/h (Doppler shift is 266 Hz) in 4 times 4 MIMO-OFDM systems. To decrease complexity, the rich feature of Alamouti-like matrix is exploited to derive an efficient very large-scale integration (VLSI) solution. Finally, this adaptive FD-CE using an in-house 0.13-mu m CMOS library occupies an area of 3 times 3.1 mm2, and the 4 times 4 MIMO-OFDM modem consumes about 62.8 mW at 1.2 V supply voltage.
Keywords :
CMOS integrated circuits; MIMO communication; OFDM modulation; VLSI; block codes; channel estimation; quadrature amplitude modulation; space-time codes; Alamouti-like matrix; CMOS library; MIMO-OFDM modems; VLSI; adaptive frequency-domain channel estimator; multiple-input multiple-output systems; orthogonal frequency-division multiplexing; quadrature amplitude modulation; size 0.13 mum; space-time block code; time-varying frequency-selective fading; very large-scale integration; voltage 1.2 V; Adaptive equalizers; VLSI; multiple-input multiple- output (MIMO) systems; orthogonal frequency-division multiplexing (OFDM);
fLanguage :
English
Journal_Title :
Very Large Scale Integration (VLSI) Systems, IEEE Transactions on
Publisher :
ieee
ISSN :
1063-8210
Type :
jour
DOI :
10.1109/TVLSI.2008.2005672
Filename :
4811933
Link To Document :
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