Power Loading Using Order Mapping in OFDM Systems With Limited Feedback

被引：15
|
作者：
Choi, Eun H. [1 ]
Choi, Wan [2 ]
Andrews, Jeffrey G. [1 ]
Womack, Baxter F. [1 ]
机构：
[1] Univ Texas Austin, Dept Elect & Comp Engn, Austin, TX 78712 USA
[2] Informat & Commun Univ, Sch Engn, Taejon, South Korea
来源：
IEEE SIGNAL PROCESSING LETTERS | 2008年 / 15卷
关键词：
Channel estimation; feedback compression; order mapping; orthogonal frequency division multiplexing (OFDM);
D O I：
10.1109/LSP.2008.925755
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：
This letter proposes an approximate waterfill power loading scheme using limited feedback in orthogonal frequency division multiplexing (OFDM) systems. The proposed technique achieves nearly the capacity of optimal waterfill power loading, while significantly reducing feedback by using order information for the subcarrier channel gains. Furthermore, the proposed power loading technique can circumvent the practical shortcomings of previous limited feedback power loading techniques by simply exploiting order mapping and interpolation. The advantages are particularly visible at low SNR or for many subcarriers, both of which will be very common in emerging wireless broadband OFDM standards.
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页码：545 / 548
页数：4
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