【摘要】：在傳統(tǒng)的組播策略中,系統(tǒng)總的吞吐量受限于組播組中最差用戶(hù)的信道增益.為了克服組播系統(tǒng)吞吐量受限的問(wèn)題,采用基于分層編碼的組播策略.在保障組內(nèi)每個(gè)用戶(hù)的服務(wù)質(zhì)量(QoS)的同時(shí),提出了一個(gè)新穎的子載波和比特分配算法,來(lái)最大化整個(gè)組播組的吞吐量.在下行的正交頻分多址無(wú)線(xiàn)組播系統(tǒng)中,提出了最優(yōu)資源分配算法.為了減少最優(yōu)化算法的計(jì)算復(fù)雜度,提出了一個(gè)2階段次優(yōu)化算法.仿真結(jié)果顯示,次優(yōu)化算法的系統(tǒng)功效十分接近最優(yōu)化算法.次優(yōu)化算法要遠(yuǎn)遠(yuǎn)優(yōu)于傳統(tǒng)的組播策略,而且還要優(yōu)于Tian等所提出的算法.
[Abstract]:In the traditional multicast strategy, the total throughput of the system is limited by the channel gain of the worst user in the multicast group. In order to overcome the problem of limited throughput of multicast system, a multicast strategy based on layered coding is adopted. At the same time, a novel subcarrier and bit allocation algorithm is proposed to maximize the throughput of the entire multicast group while guaranteeing the quality of service (QoS) of each user in the group. An optimal resource allocation algorithm is proposed in the downlink orthogonal frequency division multiple access (OFDMA) wireless multicast system. In order to reduce the computational complexity of the optimization algorithm, a two-stage sub-optimization algorithm is proposed. The simulation results show that the system efficiency of the sub-optimization algorithm is very close to the optimization algorithm. The sub-optimization algorithm is far better than the traditional multicast strategy, and it is also superior to the algorithm proposed by Tian and so on.
【作者單位】： 中國(guó)刑事警察學(xué)院公安情報(bào)學(xué)系;大連理工大學(xué)信息與通信工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(61172058) 高等學(xué)校博士學(xué)科點(diǎn)專(zhuān)項(xiàng)科研基金項(xiàng)目(20120041110011)
【分類(lèi)號(hào)】：TN929.5
，

本文編號(hào)：2159214