基于自適應(yīng)調(diào)制的改進(jìn)型VBLAST檢測算法研究
Study of Improved V-BLAST Detection Algorithm Based on Adaptive Modulation
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摘要: 根據(jù)檢測順序不同,貝爾實(shí)驗(yàn)室垂直分層空時(V-BLAST)檢測算法分為正序和逆序檢測。本文針對自適應(yīng)調(diào)制的特點(diǎn)首次將兩種檢測算法結(jié)合,提出一種新的混合檢測順序。首先檢測調(diào)制尺寸已達(dá)最大的飽和信道,然后檢測信噪比不能滿足最低門限的無效信道,最后按檢測后信噪比距離門限值最近者優(yōu)先的原則檢測剩余子信道。仿真結(jié)果表明,在平均信噪比較高或較低時,混合檢測的頻譜效率分別趨于正序或逆序檢測,當(dāng)信噪比適中時,新算法的頻譜效率優(yōu)于其它兩種算法。Abstract: Vertical-Bell Labs Layered Space-Time (V-BLAST) detection algorithm comprises forward and reverse ones according to different detection orders. Combining both algorithms, a novel detection algorithm is presented in this paper in view of the characters of adaptive modulation. New algorithm first detects the saturated channel with maximum modulation size, then detects the invalid channel which does not meet the minimum SNR threshold, finally detects the remaining channel as the criteria minimizing distance between post-detection SNR and threshold set. Simulation results show that the spectral efficiencies of proposed algorithm tend to forward or reverse order at high or low SNR respectively, and outperform the both at middle SNR.
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