Fundamental limits of diversity-embedded codes over fading channels
Diggavi, S.N.
Tse, D.N.C.
Sch. of Comput. & Commun. Sci., EPFL, Lausanne;
This paper appears in: Information Theory, 2005. ISIT 2005. Proceedings. International Symposium on
Publication Date: 4-9 Sept. 2005
On page(s): 510-514
Location: Adelaide, SA,
ISBN: 0-7803-9151-9
INSPEC Accession Number: 9035031
Digital Object Identifier: 10.1109/ISIT.2005.1523387
Current Version Published: 2005-10-31
Abstract
Diversity-embedded codes for fading channels are high-rate codes that are designed so that they have a high-diversity code embedded within them. This allows a form of communication where the high-rate code opportunistically takes advantage of good channel realizations whereas the embedded high-diversity code ensures that at least part of the information is received reliably. This can also be thought as coding the data into two streams such that the high-priority stream has higher reliability than the low-priority stream. For SISO (single-input-single-output), SIMO, MISO and parallel fading channels, we characterize the achievable rates and reliability of the two streams in the high SNR regime in terms of the diversity-multiplexing tradeoff. We exhibit the performance gain over a single-stream code. We also show some constructions for finite block lengths that achieve the optimal performance
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