【摘要】：在通信技術(shù)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(wèn)題。采用交叉極化傳輸方式對(duì)信號(hào)進(jìn)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(hào)在信道傳輸?shù)倪^(guò)程中,會(huì)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(guān)聯(lián),交叉極化干擾抵消器(XPIC)一般要具有自適應(yīng)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(yīng)抵消技術(shù)主要由自適應(yīng)迭代算法來(lái)完成。本文針對(duì)交叉極化干擾問(wèn)題展開(kāi)研究,設(shè)計(jì)實(shí)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(duì)雙極化信號(hào)的影響和交叉極化干擾產(chǎn)生和消除的原理,系統(tǒng)說(shuō)明了自適應(yīng)濾波器原理以及交叉極化干擾消除所應(yīng)達(dá)到的性能指標(biāo)。2.設(shè)計(jì)了一種基于恒模算法(CMA)和判決引導(dǎo)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(hào)和主路信號(hào)間相位同步的算法,給出了一種含有XPIC的接收機(jī)的結(jié)構(gòu)。3.對(duì)本文所設(shè)計(jì)的XPIC算法和相位同步算法進(jìn)行了詳細(xì)的仿真和驗(yàn)證,給出了所設(shè)計(jì)的XPIC所能達(dá)到的交叉極化改善度。4.給出了抵消器詳細(xì)的RTL設(shè)計(jì),仿真實(shí)驗(yàn)驗(yàn)證了系統(tǒng)的有效性,給出FPGA綜合結(jié)果和硬件資源消耗情況。本文設(shè)計(jì)的XPIC可以有效消除雙極化QAM信號(hào)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(jìn)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(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN973.3

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