【摘要】：在通信技術迅猛發(fā)展的今天,如何充分利用有限的頻譜資源是人們亟需解決的問題。采用交叉極化傳輸方式對信號進行傳輸可以有效提高頻譜利用率。但是,由于各種不利因素的存在,信號在信道傳輸?shù)倪^程中,會在交叉極化方向上產(chǎn)生交叉極化干擾(XPI)。交叉極化干擾與信道特性有著密切的關聯(lián),交叉極化干擾抵消器(XPIC)一般要具有自適應功能,能夠捕捉到信道特征并跟蹤信道的變化。交叉極化干擾的自適應抵消技術主要由自適應迭代算法來完成。本文針對交叉極化干擾問題展開研究,設計實現(xiàn)了一種交叉極化干擾抵消器,本文的主要工作包括：1.分析了信道對雙極化信號的影響和交叉極化干擾產(chǎn)生和消除的原理,系統(tǒng)說明了自適應濾波器原理以及交叉極化干擾消除所應達到的性能指標。2.設計了一種基于恒模算法(CMA)和判決引導最小均方誤差算法(DDLMS)的交叉極化干擾抵消器,給出了一種用于輔路信號和主路信號間相位同步的算法,給出了一種含有XPIC的接收機的結構。3.對本文所設計的XPIC算法和相位同步算法進行了詳細的仿真和驗證,給出了所設計的XPIC所能達到的交叉極化改善度。4.給出了抵消器詳細的RTL設計,仿真實驗驗證了系統(tǒng)的有效性,給出FPGA綜合結果和硬件資源消耗情況。本文設計的XPIC可以有效消除雙極化QAM信號因信道特性而產(chǎn)生的交叉極化干擾,相位同步模塊的加入進一步保證了XPIC的正常工作,從而有效的提高了通信系統(tǒng)的抗干擾能力。
[Abstract]:With the rapid development of communication technology, how to make full use of limited spectrum resources is an urgent problem. The spectrum efficiency can be effectively improved by using cross-polarization transmission mode to transmit the signal. However, due to the existence of various unfavorable factors, the cross-polarization interference (XPI).) will occur in the cross-polarization direction during the channel transmission. The cross-polarization interference is closely related to the channel characteristics. The cross-polarization interference canceller (XPIC) usually has the adaptive function to capture the channel characteristics and track the channel changes. Adaptive cancellation of cross-polarization interference is mainly accomplished by adaptive iterative algorithm. In this paper, a cross-polarization interference canceller is designed and implemented. The main work of this paper includes: 1. The influence of channel on double polarization signal and the principle of producing and eliminating cross polarization interference are analyzed. The principle of adaptive filter and the performance index of cross polarization interference elimination are explained systematically. A cross-polarization interference canceller based on constant modulus algorithm (CMA) and decision guided minimum mean square error (DDLMS) algorithm is designed, and an algorithm for phase synchronization between auxiliary signal and main path signal is presented. The structure of a receiver with XPIC. The XPIC algorithm and phase synchronization algorithm designed in this paper are simulated and verified in detail, and the degree of cross-polarization improvement achieved by the designed XPIC is given. The detailed RTL design of the canceller is given, and the effectiveness of the system is verified by simulation experiments. The results of FPGA synthesis and the consumption of hardware resources are given. The XPIC designed in this paper can effectively eliminate the cross-polarization interference caused by the channel characteristics of the dual-polarization QAM signal. The addition of the phase synchronization module can further ensure the normal operation of the XPIC, thus effectively improve the anti-jamming ability of the communication system.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN973.3

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