Comparação entre algoritmos de decisão em sistemas de comunicação com codificação cooperativa

Abstract

Abstract The purpose of this dissertation is to compare the performance of two decision algorithms for cooperative coding, i.e., the cooperative communication systems that performs cooperation between users by making use of channel encoder. The first of these algorithms is presented in [1]-[4] and the other is presented in [5], called here, Model 1 and Model 2, respectively. The models chosen for comparison, has some significant differences in the structures of their systems used, in addition to differences in the mechanism of cooperation and presentation of performance results, do not allowing a fair comparison between them, which motivated this work.. As an additional contribution, we propose a third algorithm, called the Model 3, which basically works as a combination of Models 1 and 2. In order to perform a fair comparison among the three cooperative coding algorithms, a scheme of channel coding Reed-Solomon (RS), modulation BPSK (binary phase-shift keying) and a flat Rayleigh fading channel were used. The performance results of the three algorithms are presented as curves of bit error rate (BER) as a function of the ratio of average energy per bit and the one-sided noise power spectral density (Eb/N0), obtained by computer simulations done using the Simulink® simulation tool integrated with MATLAB®.