結合空時區塊編碼 (space-time block code) 的空間調變 (spatial modulation)，比
起傳統的空間調變藉由一次使用兩個傳送天線可以增加多樣性。然而，現有的
STBC-SM 方案使用旋轉角度來提高頻譜效率，這導致編碼增益距離較小並且星
座擴展較小。為了解決這個問題，我們提出了一種新的 STBC-SM 方案，該方案
通過置換多個 STBC 區塊的符元而無需旋轉角度，從而通過選擇不同的排列樣式
來提高數據速率。該方案被稱為具有符號排列 (symbol permutation) 的空時區塊編
碼。我們推導了符號排列樣式並設計了 STBC-SM-SP 的例子。為了降低複雜性，
我們提出了一種簡化複雜度的最大相似度檢測器，該檢測器的複雜性隨著傳送
天線的數量呈線性增長。此外，所提出的符元排列可應用於其他 STBC-SM 方案
以提高其頻譜效率。分析界限和電腦模擬結果表明，STBC-SM-SP 和結合符元的
STBC-SM 系統都優於其他 STBC-SM 技術。

Spatial modulation (SM) with space-time block coding (STBC) increases diversity order
compared to conventional SM by activating two transmit antennas each time. However, existing
STBC-SM schemes use rotation angles to increase spectral efficiency, leading to smaller
coding-gain distance and constellation expansion. To address this, we propose a novel STBCSM scheme that permutates symbols of multiple STBC blocks without rotation angles, allowing
for increased data rate by selecting different permutation patterns. The proposed scheme is
called STBC-SM with symbol permutation (STBC-SM-SP). We derive permutation patterns
and design examples of STBC-SM-SP. To reduce complexity, we propose a reduced-complexity
maximum-likelihood (ML) detector for STBC-SM-SP, whose complexity grows linearly with
the number of transmit antennas. Moreover, the proposed symbol permutation (SP) can be
applied to other STBC-SM schemes to improve their spectral efficiency. Analytical bounds and
computer simulations demonstrate that both STBC-SM-SP and an STBC-SM system combined
with SP outperform other STBC-SM techniques

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