Title :
Efficient clustering scheme for OFDMA-based multicast wireless systems using grouping genetic algorithm
Author :
Tan, C.K. ; Chuah, Teong Chee ; Tan, S.W. ; Sim, M.L.
Author_Institution :
Fac. of Eng., Multimedia Univ., Cyberjaya, Malaysia
Abstract :
The spectral inefficiency problem faced by the conventional multicast schemes in OFDMA-based multicast systems is investigated. To improve spectral efficiency, the multicast problem is formulated as a combinatorial clustering optimisation problem where multicast groups are divided into smaller subgroups and subcarriers are allocated to each subgroup. A novel multicast clustering scheme based on a grouping genetic algorithm is proposed to maximise the aggregate data rate. Simulation results show that the proposed scheme can achieve near-optimal performance while outperforming the conventional unicast and multicast schemes.
Keywords :
OFDM modulation; genetic algorithms; multicast communication; radio networks; OFDMA-based multicast wireless system; aggregate data rate; combinatorial clustering optimisation problem; grouping genetic algorithm; multicast clustering scheme; multicast group; multicast scheme; spectral efficiency; unicast scheme;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2011.3429