Performance Analysis of Repetition Coded OFDM Systems with Diversity Combining and Higher-Level Modulation

Fumihito SASAMORI  Ziyan JIA  Shiro HANDA  Shinjiro OSHITA  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.1   pp.194-202
Publication Date: 2011/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.194
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
repetition coded OFDM,  maximum ratio combining,  higher-level modulation,  multipath fading,  closed-form equation,  

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Orthogonal frequency division multiplexing (OFDM) communication systems have great advantages, such as high spectrum efficiency and robustness against multipath fading. In order to enhance the advantages, this paper investigates an efficient utilization of both diversity combining and higher-level modulation (adaptive modulation) with a repetition code on the frequency domain in the OFDM systems. The repetition coded OFDM systems can achieve an improvement of performance with such a simple structure as one pair of transmit/receive antennas. In this paper, we derive simple closed-form equations for bit error probability (BEP) and throughput, and then improvements of those performances in the proposed OFDM systems are verified by both theoretical analysis and Monte Carlo simulation.