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Noncoherent space--time coding: an algebraic perspective
- Source :
- IEEE Transactions on Information Theory. July, 2005, Vol. 51 Issue 7, p2380, 11 p.
- Publication Year :
- 2005
-
Abstract
- The design of space--time signals for noncoherent block-fading channels where the channel state information is not known a priori at the transmitter and the receiver is considered. In particular, a new algebraic formulation for the diversity advantage design criterion is developed. The new criterion encompasses, as a special case, the well-known diversity advantage for unitary space--time signals and, more importantly, applies to arbitrary signaling schemes and arbitrary channel distributions. This criterion is used to establish the optimal diversity-versus-rate tradeoff for training based schemes in block-fading channels. Our results are then specialized to the class of affine space--time signals which allows for a low complexity decoder. Within this class, space--time constellations based on the threaded algebraic space--time (TAST) architecture are considered. These constellations achieve the optimal diversity-versus-rate tradeoff over noncoherent block-fading channels and outperform previously proposed codes in the considered scenarios as demonstrated by the numerical results. Using the analytical and numerical results developed in this paper, nonunitary space--time codes are argued to offer certain advantages in block-fading channels where the appropriate use of coherent space--time codes is shown to offer a very efficient solution to the noncoherent space--time communication paradigm. Index Terms--Diversity-versus-rate tradeoff, generalized likelihood ratio test (GLRT) receivers, noncoherent channels, space--time coding.
- Subjects :
- Information theory -- Research
Subjects
Details
- Language :
- English
- ISSN :
- 00189448
- Volume :
- 51
- Issue :
- 7
- Database :
- Gale General OneFile
- Journal :
- IEEE Transactions on Information Theory
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.133911469