Reducing feedback load for OFDM-based wireless system

doi:10.1016/S1005-8885(13)60023-0

中国邮电高校学报(英文)

Reducing feedback load for OFDM-based wireless system

李明明¹,王晓湘²,周佳

收稿日期:2012-09-25 修回日期:2012-12-06 出版日期:2013-04-30 发布日期:2013-04-26
通讯作者: 李明明 E-mail:mingmingli@bupt.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (60972076, 61072052), and the National Major Specialized Project of Science and Technology (2010ZX03003-004-03).

Reducing feedback load for OFDM-based wireless system

Received:2012-09-25 Revised:2012-12-06 Online:2013-04-30 Published:2013-04-26
Supported by:
This work was supported by the National Natural Science Foundation of China (60972076, 61072052), and the National Major Specialized Project of Science and Technology (2010ZX03003-004-03).

摘要/Abstract

摘要：

In this paper, the feedback load reduction problem in wireless systems based on orthogonal frequency division multiplexing (OFDM) is investigated and an opportunistic feedback scheme (OFS) is proposed. The key idea behind OFS is that only the key channel gains which can significantly affect the system throughput are fed back to the BS. Firstly, the key channel gains are proved to belong to a channel gain interval. Secondly, a statistical method is proposed to estimate the channel gain interval. Thirdly, the opportunistic feedback scheme is formulated and the feedback load of OFS is analyzed. The advantage of OFS is threefold: the first is OFS can work in both OFDM-based multicast system and OFDM-based unicast system. The second is the channel fading type of the BS-user link is not required, which is more realistic. The third is OFS can get better feedback load performance compared with other schemes, while achieving almost the same throughput performance compared with that of full feedback scheme.

关键词:

OFDM, wireless system, feedback load reduction, multicast system, unicast system, opportunistic feedback scheme

Abstract:

Key words:

OFDM, wireless system, feedback load reduction, multicast system, unicast system, opportunistic feedback scheme

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Reducing feedback load for OFDM-based wireless system

Reducing feedback load for OFDM-based wireless system

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