自適應全雙工系統效能分析

Abstract

摘要 全雙工技術被視為有能力成為下一代無線網路的技術，因為全雙工技術有提升頻譜效率的能力。在這篇論文中，我們分析多用戶多細胞的無線系統效能，在這樣的系統下，每一個基地台都可以支援全雙工或半雙工技術，而使用者只支援半雙工技術。然而，只使用全雙工的基地台來傳輸資訊會對每一個傳輸鏈造成干擾，這會限制全雙工技術改善的能力。因此，我們提出一個自適應全雙工系統，此系統包含全雙工細胞和半雙工細胞。根據基地台和使用者的位置關係，我們分析此基地台做全雙工的機率，利用分析的機率結果，我們可以得到目前的環境中，此細胞適合的傳輸模式。在提出的自適應全雙工系統中，細胞會選擇較大的總傳輸率模式。因此根據此分析機率，我們可以自適應地調整細胞的傳輸模式。除此之外，我們將提出的系統總傳輸率和全部半雙工系統、全部全雙工的系統比較，因此得到自適應性全雙工系統的效能分析。 關鍵字 – 全雙工; 多細胞系統; 模式選擇; 自適應系統; 隨機幾何

Full-duplex (FD) is being considered as a potential technology for the next generation of wireless networks due to its ability to boost the spectral efficiency (SE). In the thesis, we analyze the performance of a multi-user multi-cell wireless system. In the system, each base station (BS) supports full-duplex operation or half-duplex (HD) operation and user equipment (UE) only supports HD operation. However, using only FD BS increases the aggregate interference on each communication link, which limits the capacity improvement. Therefore, we propose an adaptive FD system, consists of FD cells and HD cells. Based on the position of BS and UE, we analyze the probability of FD. From the analysis result, we can obtain what operation is suitable for the cell of current environment. According to the probability, we determine the mode of the cell adaptively. The adaptive FD system can select the better mode to maximize the system sum rate. By deriving the distribution, we investigate the sum rate of the system, and compare with all HD system and all FD system. Then, the adaptive performance of the proposed system is derived.