Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/342007
Type: Artigo
Title: On the bit error rate of ofdma employing short cyclic prefix and maximal ratio combining
Author: Mora, Henry Carvajal
Garzón, Nathaly Orozco
García, Fernando Almeida
Almeida, Celso de
Abstract: Orthogonal frequency division multiple access (OFDMA) has been chosen as the fourth generation (4G) standard and also in the first releases of fifth generation (5G) mobile systems. Unfortunately, OFDMA uses a cyclic prefix that requires an increase in bandwidth and transmission power. In practical systems, there is no need to maintain a bit error rate (BER) lower than that required by a service. Hence, it is possible to reduce the cyclic prefix duration and maintaining an adequate performance. In this sense, in this work, the BER of OFDMA systems that employ a cyclic prefix shorter than the channel delay spread is evaluated. In addition, an antenna array at reception is considered. Diversity signals are combined employing maximal-ratio-combining (MRC). Assuming that noise plus intersymbol interference plus intercarrier interference can be modeled as a zero-mean Gaussian random variable, a closed form expression to calculate the BER for M-QAM modulations is derived. Simulation results show that our theoretical expression behaves as a lower bound, which becomes more accurate as the cyclic prefix duration tends to the channel delay spread
Subject: Sistemas de comunicação móvel
Multiplexação
Country: Estados Unidos
Editor: Institute of Electrical and Electronics Engineers
Rights: Fechado
Identifier DOI: 10.1109/ColComCon.2019.8809120
Address: https://ieeexplore.ieee.org/document/8809120
Date Issue: 2019
Appears in Collections:FEEC - Artigos e Outros Documentos

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