【正文】 at concern， Because the interference can be suppressed while maintaining a reasonable degree of freedom， In recent years， many interference channel models and the corresponding interference schemes have been proposed， from different angles to examine the nature of the interference. Firstly， This paper analyses the basic principle of interference alignment， characterized freedom channel capacity， and a typical X channel and Gaussian interference channel. Second， the analysis of iterative interference alignment algorithm， earlier another important concern for interference alignment schemes is the requirement of global channel knowledge. However in this work we provide examples of iterative algorithms that utilize the reciprocity of wireless works to achieve interference alignment with only local channel knowledge at each node. Algorithms of this paper are based on the channel state under ideal conditions， both are reciprocal channels， we focuses on the two distributed algorithms. That is MAXSINR and MINWLI， they use an iterative algorithm to seek a more reliable precoding vector， and interference suppression matrix. The difference between them is， the former’s purpose is try to maximize the signal to interference and noise ratio at each receiver， the another one is minimize the leakage of interference， both of them can reduce interference efficiently，achieve interference alignment. Finally， after the experimental analysis of simulation results， can get impressive transfer rate. These algorithms also provide numerical insights into the feasibility of interference alignment that are not yet available in theory. ABSTRACT Keywords IA DOF Distributed Processing Iterative Algorithm MIMO 目 錄 目 錄 符 號 表 ............................................................................................................... 4 縮略語表 ............................................................................................................... 5 第 1 章 緒論 ......................................................................................................... 1 干擾對齊的背景研究 .............................................................................. 1 干擾對齊的研究現(xiàn)狀 .............................................................................. 2 論文結構 ................................................................................................. 4 第 2 章 干擾對齊基本概念 .................................................................................. 5 信道信息 ................................................................................................. 5 自由度 ..................................................................................................... 5 干擾對齊的思想起源 .............................................................................. 8 對齊原理 ............................................................................................... 11 干擾對齊關鍵技術 ................................................................................ 13 本章小結 ............................................................................................... 14 第 3 章 干擾對齊算法的研究 ............................................................................ 15 X 信道 ................................................................................................... 15 K 用戶高斯干擾信道 ............................................................................ 17 干擾對齊算法分類 ................................................................................ 20 空間干擾對齊算法 ................................................................................ 20 時域干擾對齊算法 ................................................................................ 25 頻域干擾對齊算法 ................................................................................ 26 仿真結果 ............................................................................................... 27 本章小結 ............................................................................................... 29 第 4 章 干擾對齊的可行性 ................................................................................ 30 線性干擾解決方案 ................................................................................ 30 合適與不合適系統(tǒng) ................................................................................ 32 本章小結 ............................................................................................... 34 第 5 章 干擾對齊的回顧與展望 ........................................................................ 35 干擾對齊的回顧 .................................................................................... 35 干擾對齊的展望 .................................................................................... 36 結 論 ................................................................................................................. 38 論文工作總結 ............................................................................................... 38 未來工作展望 ............................................................................................... 38 致 謝 ................................................................................................................. 39 參 考 文 獻 ....................................................................................................... 40 符 號 表 符 號 表 ??H? 矩陣或向量的共軛轉(zhuǎn)置 ???? 數(shù)學期望 NI NN? 的單位矩陣 ? ?? ?xfO ? ? ? ?? ?xfOxg ? 表示 ? ? ? ? Cxfxgx ??? /lim （ C 是常數(shù)） )(?span 表示所張成的空間 ijH 接收機 i 和發(fā)射機 j 之間的信道系數(shù) 1? 向量的 1 范數(shù) )(Arank 矩陣 A 的秩 ??Aj? 矩陣 A 第 j 個最小特征值 ??Avd 矩陣 A 的最小特征值對應的最小特征向量 縮略語表 縮略語表 MIMO Multiple Input Multiple Output 多輸入多輸出 SISO Single Input Single Output 單輸入單輸出 CSIT Channel State Information of Transmitter 發(fā)送端信道狀態(tài)倍息 CSIR Channel State Information of Receiver 接收端信道狀態(tài)信息 BC Broadcast Channel 廣播信道 IC Interference Channel 干擾 信道 IA Interference A