Power Allocation for Multicast Service in OFDM System with Limited Feedback Scheme

被引：0
作者：
Zhu Hongfei [1 ]
Zhu Yonghua [1 ]
Zou Qiming [1 ]
机构：
[1] Shanghai Univ, Ctr Comp, Shanghai 200444, Peoples R China
来源：
2ND INTERNATIONAL SYMPOSIUM ON COMPUTER NETWORK AND MULTIMEDIA TECHNOLOGY (CNMT 2010), VOLS 1 AND 2 | 2010年
关键词：
Orthogonal Frequency Division Multiplexing (OFDM); multicast; power allocation; limited feedback;
D O I：
暂无
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
Power allocation is a key issue in multicast Orthogonal Frequency Division Multiplexing (OFDM) system. The problem of power allocation in multicast OFDM system is investigated in this paper to maximize the multicast rate under the total power constrain, while the channel coding is implemented with all subcarriers. For the purpose to reduce the considerable amount of the uplink channel state feedback information, the limited feedback scheme is proposed. In the proposed scheme, each user should only feedbacks the channel state information of the worst several subcarriers. Then, based on this limited feedback scheme, one power allocation algorithm is proposed. Simulation results show that when users feedback the worst 25% subcarriers, the proposed limited feedback scheme and power allocation algorithm achieve performance comparable to the full feedback scheme while efficiently reducing the feedback load by 75%.
引用
收藏
页码：470 / 473
页数：4
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