A practical power allocation algorithm for wireless OFDM systems

被引：0
|
作者：
Ding, Le [1 ]
Yin, Qinye [1 ]
Zhang, Yiwen [1 ]
Meng, Yinkuo [1 ]
机构：
[1] Xian Jiaotong Univ, Sch Electron & Informat Engn, Xian, Shaanxi, Peoples R China
来源：
IEICE TRANSACTIONS ON COMMUNICATIONS | 2007年 / E90B卷 / 02期
关键词：
OFDM; power allocation; water-filling;
D O I：
10.1093/ietcom/e90-b.2.381
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A sub-optimal practical computationally efficient transmit power allocation algorithm is proposed under the constraints of data rate and max bit error rate (BER) in OFDM systems. By exploiting the relation between the water-filling level and the data rate, the proposed algorithm derives an efficient adaptive coarse searching method for water-filling level without need of preset step and other initial parameters, then determines the required water-filling level by the dichotomy method. When the channel state changes, the proposed algorithm works out a small domain of required water-filling level based on the latest allocation and then tracks the channel quickly. Simulation results show that the proposed algorithm converges quickly and is suitable for time-varying channels.
引用
收藏
页码：381 / 384
页数：4
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