DocumentCode
755597
Title
On the Distortion SNR Exponent of Some Layered Transmission Schemes
Author
Bhattad, Kapil ; Narayanan, Krishna R. ; Caire, Giuseppe
Author_Institution
Qualcomm Inc., San Diego, CA
Volume
54
Issue
7
fYear
2008
fDate
7/1/2008 12:00:00 AM
Firstpage
2943
Lastpage
2958
Abstract
We consider the problem of joint source-channel coding for transmitting K samples of a complex Gaussian source overT bK uses of a block-fading multiple-input multiple-output (MIMO) channel with M transmit and N receive antennas. We consider the case when we are allowed to code over L blocks. The channel gain is assumed to be constant over a block and channel gains for different blocks are assumed to be independent. The performance measure of interest is the rate of decay of the expected mean-squared error with the signal-to-noise ratio (SNR), called the distortion SNR exponent. We first show that using a broadcast strategy similar to that of Gunduz and Erkip, but with a different power and rate allocation policy, the optimal distortion SNR exponent can be achieved for 0 les b les (|N - M| + 1)/ min(M,N) and for b > MNL2. This is the first time the optimal exponent is characterized for 1/min(M, N) < b < (|N - M| + 1)/min(M, N). Then, we propose a digital layered transmission scheme that uses both time layering and superposition. The new scheme is at least as good as currently known schemes for the entire range of bandwidth expansion factors b, whereas at least for some M, N, and b, it is strictly better than the currently known schemes.
Keywords
MIMO communication; combined source-channel coding; distortion; fading channels; receiving antennas; transmitting antennas; broadcast strategy; channel gain; complex Gaussian source; distortion SNR exponent; expected mean-squared error; joint source-channel coding; layered transmission schemes; multiple-input multiple-output channel; power allocation policy; rate allocation policy; receive antennas; signal-to-noise ratio; transmit antennas; Additive white noise; Antenna measurements; Bandwidth; Broadcasting; Channel coding; Channel state information; Distortion measurement; MIMO; Receiving antennas; Signal to noise ratio; Broadcast; distortion signal-to-noise ratio (SNR) exponent; diversity–multiplexing tradeoff; joint source–channel coding; layered source-channel coding; multiple-input multiple-output (MIMO); successive refinement; superposition;
fLanguage
English
Journal_Title
Information Theory, IEEE Transactions on
Publisher
ieee
ISSN
0018-9448
Type
jour
DOI
10.1109/TIT.2008.924703
Filename
4544951
Link To Document