一種自適應(yīng)調(diào)制V-BLAST系統(tǒng)的功率受限分配算法

全文3000字 論述翔實(shí)

摘要: 提出了一種自適應(yīng)調(diào)制垂直－貝爾實(shí)驗(yàn)室分層空時(shí)結(jié)構(gòu)（V-BLAST）系統(tǒng)的低復(fù)雜度比特、功率分配算法，滿足總平均功率和單根發(fā)射天線峰值功率受限條件下使比特率最大化。該算法可以達(dá)到與比特遞增分配算法相同的最優(yōu)分配結(jié)果，而計(jì)算量大幅度降低。仿真結(jié)果表明，在滿足目標(biāo)誤碼率條件下單天線功率限制會(huì)使比特率降低。

關(guān) 鍵 詞: 垂直－貝爾實(shí)驗(yàn)室分層空時(shí)結(jié)構(gòu),自適應(yīng)調(diào)制,分配算法,功率受限

A Loading Algorithm with Power Constraints in Adaptive Modulation for V-BLAST Systems
SONG Yang1, CHANG Yong-yu1, ZHANG Xin1,2, YANG Da-cheng1
(1. School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China;
2. State Key Laboratory of Mobile Communications, Southeast University, Nanjing 210096, China)
Abstract: A bit loading and power allocation algorithm with low complexity in adaptive modulation for vertical-Bell laboratory layered space-time systems was proposed to implement the rate maximization, satisfying peak power constraint on each antenna as well as the average total power limit. The proposed algorithm is of the same optimal allocation as the incremental algorithm while the computation complexity declines significantly. The simulation results show that the limitation of per-antenna peak power will decrease the bit rate under the target bit error rate.
Key words: vertical-Bell laboratory layered space-time; adaptive modulation; loading algorithm; power constraint


圖3 誤碼率性能

圖4 系統(tǒng)比特率

圖5 總平均功率分布
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