臺灣博碩士論文加值系統

由於廣義空間調變能夠有效地降低硬體的複雜度並且提高多輸入多輸出系統的頻譜效率，因此會成為一種次世代前瞻性的調變方式。在本篇論文裡，我們設計一種預編碼器來改善廣義空間調變多輸入多輸出系統的效能。首先我們先制定最佳化的預編碼器設計的公式，其中最佳化的目的是將最差情況下的最小自由距離給最大化。眾所周知，自由距離是用來評估最大概似檢測性能的重要指標。為了方便設計與推導，我們將預編碼器的設計分解為功率分配乘上每一個天線組合所對應到的預編碼器。經過分解後，我們可以容易地推導出預編碼器的閉合形式解，而且計算複雜度會大幅地降低，更適用於即時實作中。模擬結果驗證了我們的設計在位元錯誤率和計算複雜度上會優於現有的方法。

The generalized spatial modulation (GSM) is developed as a promising modulation scheme which effectively compromises the hardware complexity and the spectral efficiency in the multiple-input and multiple-output (MIMO) systems. In this paper, we further propose a precoding design for improving the performance of GSM-MIMO systems. We first formulate precoding design as an optimization of which the worst-case minimum free-distance can be maximized. As well know, the free-distance is the critical metric in evaluating the performance of the maximum likelihood (ML) detection. To facilitate the derivation, we then decompose the precoder design into the power allocation times a structured precoder for each antenna group. With the decomposition, we can easily derive a closed-form solution for the precoder design, which can greatly reduce the computational complexity and is suitable for the real-time implementation. Simulation results show the superiority of our design measured by both the BER and computational complexity compared with the existing methods.

目錄
論文審定書…………………………………………………………….…………………i
誌謝………………………………………………………………….…………………...ii
中文摘要………………………………………………………………………………...iii
英文摘要………………………………………………………………………………...iv
目錄………………………………………………………………………………………v
圖次……………………………………………………………………………………...vi
第1章 序言……………………………………………………………………………...1
第2章 系統模型………………………………………………………………………...7
第3章 預編碼器設計.…………………………...…………………….………………11
第3.1節 現有的預編碼器設計………………………………………………….13
第3.2節 以幾何平均值分解為基礎並包含秩數不足的預編碼器設計………..14
第4章 錯誤率分析…………………………………………………………………….19
第5章 系統模擬及探討……………………………………………………………….22
第6章 結論與未來展望……………………………………………………………….27
參考文獻………………………………………………………………………………..28
 
圖次
圖2.1廣義空間調變多輸入多輸出系統………………………………………………8
圖5.1三種廣義空間調變技術在不相關通道下的效能表現…………………………23
圖5.2不同預編碼器設計的廣義空間調變技術在不同相關係數的相關通道下的效能表現……………………………………………………………………………………24
圖5.3三種廣義空間調變技術在 的相關通道下的自由距離…………..24
圖5.4三種廣義空間調變技術 的相關通道下的自由距離…………...25
圖5.5三種廣義空間調變技術在 的相關通道下的自由距離………...25

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