Quality of service constrained throughput optimisation for joint adaptive transmission with automatic repeat request over block-fading channels

被引:14
作者
Harsini, J. S. [1 ]
Lahouti, F. [1 ]
机构
[1] Univ Tehran, Sch Elect & Comp Engn, Wireless Multimedia Commun Lab, Ctr Excellence Appl Electromagnet Syst, Tehran 14174, Iran
关键词
ARQ; WIRELESS; PERFORMANCE; MODULATION; SYSTEMS;
D O I
10.1049/iet-com.2008.0305
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
080906 [电磁信息功能材料与结构]; 082806 [农业信息与电气工程];
摘要
An optimisation framework for wireless link adaptation which maximises the system throughput subject to a packet-level quality of service (QoS) constraint is presented. The authors consider joint adaptive variation of the transmitted power level, transmission data rate and packet-error-rate (PER) at the physical layer to improve the throughput performance of the selective-repeat automatic repeat request (SR-ARQ) protocol over block-fading channels. Specifically, for discrete-rate coded M-QAM schemes, the authors present a power and rate adaptation algorithm that guarantees a target PER constraint. The proposed framework also facilitates optimising the throughput performance for delay constrained wireless applications, which imposes a limit on the number of retransmissions for the ARQ. In particular, a link adaptation scheme is presented, which guarantees a target packet-loss rate (PLR) when a truncated SR-ARQ protocol at the data-link layer is employed. Numerical results indicate that the proposed adaptation schemes compared with other adaptive schemes noticeably enhance the system throughput. Also, in the case of truncated ARQ, the results illustrate a fundamental trade-off between the delay and PLR QoS metrics achieved at the maximum throughput performance.
引用
收藏
页码:1030 / 1040
页数:11
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