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The cross-entropy (CE) method was proposed to estimate the probability of rare events. Afterwards, it was applied to solve combinatorial optimization problems. This paper presents a CE-based method that adaptively allocates sub-carrier, bit, and power in orthogonal frequency division multiple access systems to obtain minimum total transmit power under given quality of service requirements, that is,...
Nowadays, the spread of wireless applications has led to the need of new spectrum resources and to the need to exploit in a more dynamic and efficient way those already in use. Several recent research works have confirmed the presence of unused spectrum portions in the range 30 MHz-3 GHz. As a consequence, developing new techniques to assure the utilization of these unused resources has become a key...
Broadband power-line communication (BPLC) is recognized as an attractive method for access networks and the orthogonal frequency division multiplexing (OFDM) with dynamic resource allocation is the key technology in combating with the multi-path fading and time-varying characteristics of power line channel. With the goal of fairness in bandwidth and maximum total throughput for all the users, a novel...
Adaptive resource allocation is one of the most challenging tasks for multiuser orthogonal frequency division multiplexing (OFDM) systems. In this paper, two evolutionary approaches, genetic algorithm (GA) and particle swarm optimization (PSO) have been applied for adaptive subcarrier and bit allocations to minimize the overall transmit power of a multiuser OFDM system. Each user will be assigned...
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