中继系统基于QoS保障的跨层优化设计

doi:10.3969/j.issn.1001-2400.2013.02.013

Abstract

Abstract:

In order to improve the throughput and guarantee the quality-of-service (QoS) for a relay system, a cross-layer design scheme which combines adaptive modulation and coding (AMC) at the physical layer with cooperative hybrid automatic repeat request (CHARQ) at the link layer is proposed over the Nakagami-m fading channel. Firstly, the system packet loss rate (PLR) is described and analyzed through the state transition diagram. Then, the queuing delay is derived using the queuing theory. Moreover, a cross-layer model for maximizing system throughput is presented under the constraints of PLR, queuing delay and transmission delay. Numerical results show that the cross-layer design scheme combining CHARQ with AMC can achieve the optimal throughput, the smallest PLR and the shortest queuing delay and transmission delay.

Key words: hybrid automatic repeat request (HARQ), adaptive modulation and coding (AMC), state transition diagram, Markov model, Nakagami-m channel

TANG Lun;ZHANG Rongrong;CHEN Qianbin. Cross-layer optimization and design based on QoS guarantees in the relay system[J].J4, 2013, 40(2): 72-81.

References

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Cross-layer optimization and design based on QoS guarantees in the relay system

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