一種降低接收機復(fù)雜度的差分空時調(diào)制方案
A Differential Space-Time Modulation Scheme with Reduced Receiver Complexity
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摘要: 基于對角信號的差分酉空時調(diào)制技術(shù)不需要信道估計并能實現(xiàn)滿天線分集，但接收機的計算復(fù)雜度與發(fā)射天線數(shù)和數(shù)據(jù)率成指數(shù)關(guān)系。該文針對發(fā)射天線數(shù)為偶數(shù)的系統(tǒng)，提出了一種降低接收機計算復(fù)雜度的差分空時調(diào)制方案。該方案將發(fā)射天線分成相等數(shù)目的兩組并在每一組天線上分別進行對角酉空時調(diào)制，接著構(gòu)造差分編碼矩陣使得兩個對角信號的最大似然檢測可以分開進行，從而大大降低了接收機的計算復(fù)雜度。理論分析和仿真表明，該方案仍實現(xiàn)了滿天線分集，并且對于某些應(yīng)用環(huán)境能提供比對角信號更好的誤比特率性能。
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關(guān)鍵詞:
- 差分酉空時調(diào)制;空時編碼;天線分集;差分檢測
Abstract: Differential Unitary Space-Time Modulation (DUSTM) based on diagonal signals achieves full antenna diversity without requiring channel estimation. However, its receiver has a computational complexity that grows exponentially with the number of transmit antennas and the data rate. To reduce receiver complexity, a new DUSTM scheme is proposed for systems where the number of transmit antennas is even. The scheme partitions transmit antennas into two groups with equal number of antennas, and diagonal unitary space-time modulation is applied on each group. The differential encoding matrix is constructed so that maximum-likelihood detection of the two diagonal signals can be decoupled, thereby reducing receiver complexity significantly. Theoretical analysis and simulation results show that the proposed scheme preserves full antenna diversity and provides better bit-error rate performance than diagonal signals in some scenarios. -
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