Title:
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Optimum power allocation and bit loading for BICM systems
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Author:
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Matas Navarro, David; Lamarca Orozco, M. Meritxell
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions |
Abstract:
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This paper introduces a joint bit loading and power allocation algorithm for systems combining bit-interleaved coded modulation (BICM) with multicarrier transmission. The proposed algorithm maximizes the mutual information, so it can be regarded as a generalization of mercury/waterfilling policy
that incorporates bit loading.
The followed approach relies on irregular modulation and power to cast the problem in the framework of convex optimization.
This allows to derive the optimum solution without resorting to greedy algorithms, embedding the bit loading in the definition of an equivalent constellation such that the complexity increase with respect to mercury/waterfilling is negligible. While irregular modulation plays a key role in algorithm definition, it is proved that only a few subcarriers employ it and it is shown that a practical low complexity algorithm can
be obtained with minimal losses that does not use irregular modulation. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telemàtica i xarxes d'ordinadors::Xarxes de banda ampla -Orthogonal frequency division multiplexing -OFDM -BICM -Banda ampla, Sistemes de comunicació de |
Rights:
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Document type:
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Article - Published version Article |
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