Performances of the H-ARQ Adaptive-QAM Transmissions over Multipath Channels

Authors:
Vasile Bota;Zsolt A. Polgar;Mihaly Varga
Affiliations:
Communications Department, Technical University of Cluj-Napoca, Cluj-Napoca, Romania 400027;Communications Department, Technical University of Cluj-Napoca, Cluj-Napoca, Romania 400027;Communications Department, Technical University of Cluj-Napoca, Cluj-Napoca, Romania 400027
Venue:
Wireless Personal Communications: An International Journal
Year:
2008

Citing 2
Cited 0

Wireless Communications: Principles and Practice

Wireless Communications: Principles and Practice
Good error-correcting codes based on very sparse matrices

IEEE Transactions on Information Theory

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Abstract

This paper presents the evaluation of the average spectral efficiencies provided by the adaptive use of a set of LDPC-coded QAM modulations in an OFDMA downlink scheme over mobile radio channels, considering a joint modeling of the channel and user-access method. It discusses the selection of the set of coded modulations, briefly describes the joint modeling of the channel and access method employed, and derives the average spectral efficiency provided by this approach in non-ARQ or H-ARQ environments. Some comments about the effects of the system's parameters upon its performances are also included.