Title :
Feedback load reduction scheme in OFDM-based wireless multicast systems
Author :
Mingming Li ; Xiaoxiang Wang ; Dongyu Wang ; Jia Zhou
Author_Institution :
Key Lab. of Universal Wireless Commun., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
To reduce the feedback load of OFDM-based wireless multicast systems, an opportunistic feedback scheme (OFS) is proposed. OFS aims to only feed the key channel gains that can significantly affect the system throughput back to the base station (BS). By mathematical derivation, the key channel gains are proved to belong to a channel gain interval, which can be estimated by a proposed statistical method. Simulation results show that OFS can significantly reduce the feedback load of OFDM-based multicast system, while remaining 99% multicast throughput performance compared with the full feedback scheme. Besides, the channel fading type of the BS-user link is not required, which would be more realistic.
Keywords :
OFDM modulation; channel estimation; feedback; multicast communication; statistical analysis; wireless channels; BS; BS-user link; OFDM-based wireless multicast systems; OFS; base station; channel fading type; channel gain interval; feedback load reduction scheme; full feedback scheme; key channel gains; opportunistic feedback scheme; statistical method; Channel estimation; Feeds; Load modeling; OFDM; Resource management; Throughput; Wireless communication; OFDM; Opportunistic feedback; feedback load; multicast systems;
Conference_Titel :
Wireless Communications and Networking Conference (WCNC), 2013 IEEE
Conference_Location :
Shanghai
Print_ISBN :
978-1-4673-5938-2
Electronic_ISBN :
1525-3511
DOI :
10.1109/WCNC.2013.6554712
