混合自动重传系统中的功率与速率联合优化方法.pdfVIP

43 4 浙 江 大 学 学 报( ) Vol.43 o.4 2009 4 Journal of Zhejiang University(Engineering Science) Apr. 2009 DOI: 10.3785/j.issn. 1008973X.2009. 04.009 HARQ 林挺萃, 殷 锐, 张朝阳 ( , 310027) : ( HARQ) . IEEE 802. 16e , , HARQ ,. ,, ., , . , . : IEEE 802. 16e; ;;; : T 914.51 : A : 1008973X(2009 Joint optimization with power and rate control in HARQ system LI Tingcui, YI Rui, ZHA G Zhaoyang ( Dep artment of I nf ormation Science and Electronic Engineering, Zhej iang University , H angzhou 310027, China) Abstract: T he relation among maximum retransmission times, power in every transmission, subpacket length, modulation bits, coding rate in hybrid automatic repeat request ( HARQ) transmission mode and the system throughput was studied. A feedback mode with channel parameters was proposed based on IEEE 802. 16e protocol to enhance the throughput of wireless transmission system. T he constraint of pow er allocation and packet error rate in the modewas given, which is different from that in transmission mode with fixed parameters. A model under additive white Gaussian noise channel was established to analyze the influence on the throughput caused by different parameters and the corresponding optimization dependent on certain parameter. A suboptimal algorithm was proposed to adaptively update parameters. Simulation results show that the algorithm can achieve much higher system performance than the traditional algorithm with constant parameters. The system throughput dynamically increases when channel condition gets bet ter. The algorithm can get high system throughput with low complexity when channel condition can be precisely detected by the receiver. Key words: IEEE 802. 16e; hybrid automatic repeat request (HARQ) ;orthogonal