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The orthogonal frequency-division multiplexing (OFDM) which has underlying sensing and spectrum shaping capabilities, is indeed well suited to fulfill the requirements of next generation communications. In a multipath environment, bit error rate (BER) is dominated by few subcarriers with small amplitudes because of the deep fades. This requires employing forward error correction (FEC) method on the...
Spectrum sensing (SS) is the key enabling technology for wideband cognitive radio networks, where two coexisting systems share the same frequency band. The critical task of SS is required to detect spectrum opportunities and to determine if the spectrum allocation meets the quality of service (QoS) requirements of different users. In case of missed detection, collision happens between secondary and...
The compact genetic algorithm cGA is used in this paper to design an efficient soft-decision decoding algorithm, especially for the cyclic codes, because the cGA dramatically reduces the population's size and rapidly converges to the optimal solution compared to classical genetic algorithms. Our main contribution is to exploit the cyclic property of cyclic linear codes to reduce the complexity of...
In this paper we present an efficient new soft-decision decoding algorithm suitable to be applied to any binary cyclic codes. The idea behind our decoding algorithm is the exploitation of the cyclic property available on the most popular linear block codes which are cyclic codes. Numerical results for the proposed algorithm are presented; the plotted curves show that the performances of our decoder...
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