Energy efficient HARQ scheme for wireless communication
over block fading channel

doi:10.1016/S1005-8885(15)60650-1

中国邮电高校学报(英文) ›› 2015, Vol. 22 ›› Issue (3): 35-40.doi: 10.1016/S1005-8885(15)60650-1

Energy efficient HARQ scheme for wireless communication over block fading channel

Wu Yue, Yang Hongwen

Wireless Communication Center, Beijing University of Posts and Telecommunications

收稿日期:2014-12-15 修回日期:2015-03-23 出版日期:2015-06-30 发布日期:2015-06-24
通讯作者: Wu Yue, E-mail: wuyue@bupt.edu.cn E-mail:wuyue@bupt.edu.cn
基金资助:
National Natural Science Foundation of China (61072059).

Energy efficient HARQ scheme for wireless communication over block fading channel

Wu Yue, Yang Hongwen

Wireless Communication Center, Beijing University of Posts and Telecommunications

Received:2014-12-15 Revised:2015-03-23 Online:2015-06-30 Published:2015-06-24
Contact: Wu Yue, E-mail: wuyue@bupt.edu.cn E-mail:wuyue@bupt.edu.cn
Supported by:
National Natural Science Foundation of China (61072059).

摘要/Abstract

摘要： Energy efficiency (EE) can be enhanced by retransmissions and combining in hybrid automatic repeat request (HARQ) system. However, it is difficult to optimize the transmit power of each retransmission when the accurate retransmission number and future channel state information (CSI) cannot be obtained. This paper proposes a simple energy efficient HARQ scheme for point-to-point wireless communication. In the proposed scheme, the conditional word error rate (WER) of each retransmission is fixed and the transmit power is adapted correspondingly. Three performance metrics are analyzed including average transmission number, throughput and EE. Compared with the conventional equal power HARQ scheme, the proposed scheme can significantly improve the EE and other two metrics under the same constraint of average transmit power or average energy consumption. Furthermore, it is found that, selecting a conditional WER which is slightly smaller than the optimal one is sufficient for practical implementation.

关键词: Energy efficiency, hybrid automatic repeat request (HARQ), conditional word error rate

Abstract: Energy efficiency (EE) can be enhanced by retransmissions and combining in hybrid automatic repeat request (HARQ) system. However, it is difficult to optimize the transmit power of each retransmission when the accurate retransmission number and future channel state information (CSI) cannot be obtained. This paper proposes a simple energy efficient HARQ scheme for point-to-point wireless communication. In the proposed scheme, the conditional word error rate (WER) of each retransmission is fixed and the transmit power is adapted correspondingly. Three performance metrics are analyzed including average transmission number, throughput and EE. Compared with the conventional equal power HARQ scheme, the proposed scheme can significantly improve the EE and other two metrics under the same constraint of average transmit power or average energy consumption. Furthermore, it is found that, selecting a conditional WER which is slightly smaller than the optimal one is sufficient for practical implementation.

Key words: Energy efficiency, hybrid automatic repeat request (HARQ), conditional word error rate

中图分类号:

TN911

Wu Yue, Yang Hongwen. Energy efficient HARQ scheme for wireless communication over block fading channel [J]. Acta Metallurgica Sinica(English letters), 2015, 22(3): 35-40.

参考文献

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Energy efficient HARQ scheme for wireless communication over block fading channel

Energy efficient HARQ scheme for wireless communication over block fading channel

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