NDLI: Orthogonal space time block coding in fast flat fading channels

Content Provider	IEEE Xplore Digital Library
Author	Jaekwon Kim Ki Taek Bae Won Gi Jeon Powers, E.J.
Copyright Year	2004
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA (Jaekwon Kim; Ki Taek Bae)
Abstract	Transmit diversity techniques increase transmission reliability over wireless fading channels. Complex orthogonal codes can be used to generate redundant transmit signals from multiple antennas. We consider the decoding of a high order orthogonal space time block coding under fast fading channel environments. In an effort to mitigate the severe performance degradation of the conventional simple decoding, least squares decoding and a quadratic optimization decoding (QOD) are applied to the problem. Simulation experiment results suggest that QOD obtains a significant SNR gain at SER of 10/sup -3/ and is rather robust to a degree of time variation of the channels. We also show that least squares decoding achieves a significant performance improvement relative to conventional decoding when the time variation degree is significant (f/sub D/T/sub s/=0.01, where f/sub D/ is the Doppler frequency and T/sub s/ is the symbol period), however, it does not obtain a significant SNR gain when channel variation is not significant (f/sub D/T/sub s/=0.005). Therefore. we can conclude that QOD is a good decoding technique for fast fading channels.
Starting Page	2473
Ending Page	2476
File Size	506142
Page Count	4
File Format	PDF
ISBN	0780385217
ISSN	10903038
DOI	10.1109/VETECF.2004.1400498
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-09-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Jaekwon Kim Ki Taek Bae Won Gi Jeon Powers, E.J. Signal generators Transmitting antennas Degradation Robustness Frequency Performance gain
Content Type	Text
Resource Type	Article

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