The aims of this paper are threefold: (i) to present a model for the complex -fading channel; (ii) to propose an efficient, simple, and general method to generate complex -samples; (iii) to make use of this channel in order to assess the bit error rate performance of an OFDM system. An analytical framework is then used, whose output is validated through Monte Carlo simulation. Several important conclusions concerning the system performance as a function of the channel parameters, namely, nonlinearity, clustering, and power imbalance of in-phase and quadrature components, are drawn.
Resumo-Este artigo apresenta uma análise matemática para o desempenho em termos de taxa de erro de símbolo de sistemas OFDM-PSK em canais com desvanecimento Nakagami-m complexo. O ganho complexo do canalé parametrizado de forma a se considerar o desbalanceamento de potência entre as partes real e imaginária. Adicionalmenteé considerado um sistema com diversidade utilizando um combinador de máxima razão. Toda a análise matemáticaé comprovada via simulação de Monte-Carlo. Os resultados demonstram que a não consideração do parâmetro de fase no modelo pode resultar em uma subestimação da taxa de erro de símbolo do sistema.
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