一種新的酉空時調(diào)制
A Novel Unitary Space-Time Modulation
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摘要: 為了更有效地提高系統(tǒng)的頻帶利用率,該文提出一種多調(diào)制方式聯(lián)合的設(shè)計思想,并推導出其實現(xiàn)的必要條件和幾種可能途徑。由理論結(jié)果導出一種新的調(diào)制方式差分相位酉空時調(diào)制(DPUSTM),并設(shè)計了相應(yīng)的非相干解調(diào)算法。DPUSTM將酉空時調(diào)制(USTM)和差分相移鍵控(DPSK)調(diào)制有機地融合,在提高系統(tǒng)頻帶利用率方面比目前已有的USTM系統(tǒng)更簡單易行??梢暂^低的復雜度分別解調(diào)出酉空時(UST)信號和DPSK信號,不僅保持了UST信號低誤比特率的優(yōu)點,并可適用于多種速率并行傳輸?shù)臒o線數(shù)據(jù)通信。仿真結(jié)果證明理論分析和給出的設(shè)計是有效的,而且表明了DPUSTM的性能可比USTM和DSTM更優(yōu)越。Abstract: In order to improve the spectral efficiency, this paper proposes a new framework for designing a modulation consisting of more than one modulation method. The new modulation method is able to provide better spectral efficiency while preserving the merits of Unitary Space-Time Modulation (USTM), such as low error rate and demodulation simplicity. The necessary condition for this set of modulations is presented and several different options satisfying the condition are given. Finally a novel modulation called Differential Phase Unitary Space-Time Modulation (DPUSTM) is designed as a special case. DPUSTM, which consists of USTM and Differential Phase-Shift Keying (DPSK) modulation, is not only easier to improve the spectral efficiency than USTM, but also simpler to demodulate. The novel modulation can achieve low bit error rate as UST signals and be exploited in multi-rate data communication. The simulation results not only verify the theoretical analysis, but also show that DPUSTM provides a better performance than USTM and DSTM.
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