Title :
Capacity Maximization and Transmission Rates Optimization for Relay Assisted Wireless Multicast
Author :
Wang, Haibo ; Chu, Xiaoli ; Xiang, Hongliang
Author_Institution :
Sch. of Electron. & Inf., Beijing Jiaotong Univ., Beijing, China
fDate :
10/1/2012 12:00:00 AM
Abstract :
In this letter, we maximize the multicast capacity of a cellular system with dedicated decode-and-forward (DF) relays, by jointly optimizing transmission data rates of the base station (BS) and the relays subject to an average outage constraint in Rayleigh fading channels. The optimal transmission rates of the BS and relays and the optimal relay locations are obtained based on an outage probability analysis for the relay-assisted multicast. Numerical results show that relay-aided multicast significantly outperforms direct multicast, and the best transmission strategy is for the BS and dedicated relays to transmit at the same rate.
Keywords :
Rayleigh channels; cellular radio; decode and forward communication; multicast communication; optimisation; radio networks; Rayleigh fading channels; average outage constraint; base station; best transmission strategy; capacity maximization; cellular system; dedicated decode-and-forward relays; direct multicast; multicast capacity; optimal relay locations; optimal transmission rates; outage probability analysis; relay assisted wireless multicast; relay-aided multicast; relay-assisted multicast; transmission data rates; transmission rates optimization; Fading; Optimization; Receivers; Relays; Resource management; Signal to noise ratio; Wireless communication; Multicast capacity; decode-and-forward; outage probability; rate allocation; relay;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2012.090312.120782
