具排列的空時區塊編碼之空間調變的進階結果;Futher Results of Space-Time Block Coded Spatial Modulation with Permutations

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题名:	具排列的空時區塊編碼之空間調變的進階結果;Futher Results of Space-Time Block Coded Spatial Modulation with Permutations
作者:	鄭元富 Cheng, Yuan-Fu
贡献者:	通訊工程學系
关键词:	空間調變;空時區塊碼;SM;STBC
日期:	2024-07-16
上传时间:	2024-10-09 16:50:55 (UTC+8)
出版者:	國立中央大學
摘要:	不同累積區塊中的時間排列（TP-DAB），可以應用於現有的STBC-SM架構以提高頻譜效率。然而，檢測複雜度高，限制了套用在STBC-SM架構的應用。我們提出了一種低複雜度的最大可能性（ML）檢測器，此技術通過降低檢測器內部計算矩陣的次數，保證錯誤性能，其乘法複雜度大幅低於原始ML檢測器。除了頻寬效益的優勢之外，電腦模擬結果也表明，在不同數量的發射天線（????=4,6,8）下，使用TP-DAB 的STBC-SM架構比原始架構提供更好的錯誤表現。特別是當累積區塊個數等於碼字個數時，我們觀察到編碼增益顯著，顯示了TP-DAB的優勢。然而，當累積區塊數量超過五個時，檢測複雜度呈現增加趨勢。針對此問題，我們提出了另一種改進的非最大可能性檢測方法，雖然犧牲了錯誤率性能，但能有效降低在大量累積區塊下的加法複雜度。;Temporal Permutation Distributed Antenna Block (TP-DAB) can be applied to existing Space-Time Block Code Spatial Modulation (STBC-SM) architectures to enhance spectral efficiency. However, the high complexity of detection has limited its application within the STBC-SM framework. We propose a low-complexity Maximum Likelihood (ML) detector, which reduces the frequency of internal computation matrix operations, thus ensuring error performance while significantly decreasing the multiplicative complexity compared to the original ML detector. In addition to the advantages in bandwidth efficiency, computer simulations demonstrate that the TP-DAB-enhanced STBC-SM architecture provides superior error performance under various numbers of transmit antennas (???? = 4,6,8). Particularly when the number of accumulated blocks equals the number of codewords, we observed a significant coding gain distance, highlighting the benefits of TP-DAB. However, as the number of accumulated blocks exceeds five, the complexity of detection tends to increase. To address this issue, we have developed an improved non-maximum likelihood detection method, which, although it sacrifices some error rate performance, effectively reduces the complexity of addition in scenarios with a large number of accumulated blocks.
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