- 學位論文
超高密度網路下干擾感知接收機之設計
Interference-Aware Receiver Design in Ultra Dense Network
摘要
由於行動數據流量的快速成長，為了增加網路容量，超高密度網路是下一代行動數據通訊標準的候選之一，然而，傳統的線性接收機無法應付超高密度網路帶來的嚴重干擾問題，未來我們很有可能得用功能更強的干擾感知接收機才能達到足夠的效能，而干擾感知接收機的複雜度又比線性接收機大很多，本論文提出降低複雜度的演算法來達到使用者可接受的錯誤率，希望在未來5G的超高密度網路佈建之下，使用者能夠以低複雜度的手機達到足夠的效能。 本論文針對超高密度網路的干擾情境對不同程度的干擾做不同的處理，針對強干擾，本論文提出樹狀搜尋位元干擾消除接收機，可以不論在平坦或快速通道下都能有效消除超高密度網路下來自MBS的強干擾，而對剩餘的弱干擾，本論文提出縮小星座點搜尋的方法降低樹狀搜尋的走訪點，並針對此方法做理論錯誤率分析，另外提出恰可接受錯誤率之縮小星座點搜尋位元干擾消除接收機，能根據縮小星座點的理論錯誤率分析動態選擇縮小星座點搜尋數目。
並列摘要
Data traffic demand in cellular networks grows up very fast. To increase network capacity, Ultra Dense Network is a candidate technique in next generation mobile communication. However, traditional linear receiver is no longer applicable due to the severe interference problem in Ultra Dense Network scenario. We probably use interference-aware receiver which complexity is much higher than linear receiver to get acceptable performance. This thesis proposes low-complexity interference-aware receiver while maintaining acceptable performance. Due to the difference of transmit power of different types of base station, we will encounter different interference streams. For strong interference stream, we propose Tree Search with Bit-level Cancellation Receiver which can cancel strong interference effectively both in flat fading and fast fading channel. For the residual weak interference, we propose Reduced Constellation search to reduce visit node during tree search and we analyze the error rate of Reduced Constellation search. Besides, we propose Just Acceptable Error Rate Reduced Constellation Bit-Level Cancellation Sphere Decoder which can dynamically switch Reduced Constellation search configuration by Reduced Constellation search error rate analysis.