Improved performance of LDPC-coded MIMO systems with EP-based soft-decisions
| Autor: | Javier Cespedes, Matilde Sanchez-Fernandez, Fernando Perez-Cruz, Pablo M. Olmos |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Expectation Propagation
LDPC Telecomunicaciones Theoretical computer science Complexity theory Lattice Detectors Approximation methods Vectors Multi-user MIMO Approximation algorithms Improved performance MIMO Electronic engineering Parity check codes Low Complexity receive Low-density parity-check code MIMO communication systems Mathematics Mimo systems |
| Zdroj: | ISIT e-Archivo. Repositorio Institucional de la Universidad Carlos III de Madrid instname |
| Popis: | The proceeding at: IEEE International Symposium on Information Theory (ISIT 2014), took place 2014, June 29-July 04, in Honolulu (Hawai) Modern communications systems use efficient encoding schemes, multiple-input multiple-output (MIMO) and high-order QAM constellations for maximizing spectral efficiency. However, as the dimensions of the system grow, the design of efficient and low-complexity MIMO receivers possesses technical challenges. Symbol detection can no longer rely on conventional approaches for posterior probability computation due to complexity. Marginalization of this posterior to obtain per-antenna soft-bit probabilities to be fed to a channel decoder is computationally challenging when realistic signaling is used. In this work, we propose to use Expectation Propagation (EP) algorithm to provide an accurate low-complexity Gaussian approximation to the posterior, easily solving the posterior marginalization problem. EP soft-bit probabilities are used in an LDPC-coded MIMO system, achieving outstanding performance improvement compared to similar approaches in the literature for low-complexity LDPC MIMO decoding. This work has been partly funded by the Spanish Ministry of Science and Innovation with the projects GRE3NSYST (TEC2011-29006-C03-03) and ALCIT (TEC2012-38800-C03-01) and by the program CONSOLIDERINGENIO 2010 under the project COMONSENS (CSD 2008-00010). Publicado |
| Databáze: | OpenAIRE |
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