|Abstract: ||在空間調變多天線(Spatial Modulation Multiple Input Multiple Output , SM-MIMO)系統下, 最佳的檢測器(detector)是最大相似度檢測器(maximum likelihood detector, MLD) , 但是MLD 有計算複雜度過高的問題, 在硬體實作上也不容易實現, 因此許多降低計算複雜度並且錯誤率表現能接近MLD 的演算法被研究出來。而由一般的SM 系統衍生出使用多根觸發天線傳送不同符元(symbol) 稱為空間調變使用多根觸發傳送天線(Multiple Active-Spatial Modulation, MA-SM) , 其中一種MA-SM 低複雜度的線性偵測法(Low complexity linear detection algorithm) 是分成兩部分進行估測, 第一部份先估計出L 組觸發天線的組合, 再利用估計出的天線組合來估測第二部分, 找到相對應的傳送符元(symbol) 。不像聯合偵測, 將觸發天線與傳送符元分開檢測的方式是犧牲性能的降低來達到低複雜度。在硬體實現的方面,設定的環境是在4 × 4多天線系統, 2根觸發天線(active antenna), 使用16-QAM 調變, 列舉的L值設為2 , 定點數的模擬結果假設13位元長度來用在提出的硬體架構上, 被提出的設計以Verilog HDL 程式來被撰寫, 並以Synoposis 的Design Compiler去做合成(synthesis) 。|
In the spatial modulation multiple input multiple output (SM-MIMO) system, thebest detector is the maximum likelihood detector (MLD). But MLD has the problem of high computational complexity and is not easily implemented by hardware architecture. Therefore many detection algorithms that are of low computational complexity and error rate performance close to theMLD are studied. Extension of the conventional SM-MIMO system to use multiple active transmit antenna for transmitting different symbols is called multiple active-spatial modulation (MA-SM). Low complexity linear detection algorithm of MA-SM signals are comprised of two steps. In the first step, estimation of the L groups of active antennas is performed; and, detection of the transmitsymbols from the estimated groups of active antennas is performed in the second step. Unlike the joint detection, such separate detection of the active antennas and transmit symbols is of low complexity at the expense of performance degradation. For the hardware implementation, a 4-by-4 MIMO system with two active antennas transmitting 16-QAM signals is considered. The number of groups L is set to 2. The fixed point simulation results suggest that word length of the proposed architecture is 13 bits. The proposed design is described by Verilog HDL and synthesized by Synoposis Design Compiler.