一種新穎的基于子矩陣交織的差分酉空時(shí)調(diào)制
A Novel Sub-matrix Interleaved Differential Unitary Space-Time Modulation
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摘要: 差分酉空時(shí)調(diào)制(DUSTM)是一種應(yīng)用于時(shí)變衰落信道下的多天線調(diào)制方法。該方法在慢衰落信道下無(wú)需知道信道狀態(tài)信息而能獲得全發(fā)送分集增益。但是，在快速衰落信道下，其性能明顯惡化并且呈現(xiàn)出較高的誤碼平層。該文通過(guò)在差分酉空時(shí)調(diào)制中引入矩陣分割和子矩陣交織等操作提出了一種基于子矩陣交織的差分酉空時(shí)調(diào)制(SMI-DUSTM)方案，并對(duì)其性能進(jìn)行了分析。性能分析和相應(yīng)的計(jì)算機(jī)仿真證明了SMI-DUSTM 不僅能夠繼承DUSTM在慢衰落信道下的優(yōu)點(diǎn)，而且在快速衰落信道下能夠保持良好的系統(tǒng)性能。
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關(guān)鍵詞:
- 差分酉空時(shí)調(diào)制; 時(shí)變衰落; 多天線; 交織
Abstract: Differential Unitary Space-Time Modulation (DUSTM), which is a multi-antenna modulation technique for time-varying fading channels, can obtain full diversity gains without channel state information at the receiver in slowly fading channels. For fast fading channels, however, its performance degrades considerably and suffers an irreducible error floor. In this paper, a novel Sub-Matrix Interleaved Differential Unitary Space-Time Modulation (SMI-DUSTM) scheme is proposed, in which matrix-segmentation and sub-matrix based interleaving are combined with conventional DUSTM. The constellation design criteria of SMI-DUSTM are also derived in this paper, based on the calculation of Pairwise Error Probability (PEP). The performance analysis and simulation results demonstrate that SMI-DUSTM can not only inherit the merit of DUSTM in slowly fading channels, but also maintain a good performance in fast fading channels. -
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