宽带无线交叉极化干扰抵消器的研究与设计
发布时间：2018-08-15 16:30
【摘要】：在通信技术迅猛发展的今天,如何充分利用有限的频谱资源是人们亟需解决的问题。采用交叉极化传输方式对信号进行传输可以有效提高频谱利用率。但是,由于各种不利因素的存在,信号在信道传输的过程中,会在交叉极化方向上产生交叉极化干扰(XPI)。交叉极化干扰与信道特性有着密切的关联,交叉极化干扰抵消器(XPIC)一般要具有自适应功能,能够捕捉到信道特征并跟踪信道的变化。交叉极化干扰的自适应抵消技术主要由自适应迭代算法来完成。本文针对交叉极化干扰问题展开研究,设计实现了一种交叉极化干扰抵消器,本文的主要工作包括：1.分析了信道对双极化信号的影响和交叉极化干扰产生和消除的原理,系统说明了自适应滤波器原理以及交叉极化干扰消除所应达到的性能指标。2.设计了一种基于恒模算法(CMA)和判决引导最小均方误差算法(DDLMS)的交叉极化干扰抵消器,给出了一种用于辅路信号和主路信号间相位同步的算法,给出了一种含有XPIC的接收机的结构。3.对本文所设计的XPIC算法和相位同步算法进行了详细的仿真和验证,给出了所设计的XPIC所能达到的交叉极化改善度。4.给出了抵消器详细的RTL设计,仿真实验验证了系统的有效性,给出FPGA综合结果和硬件资源消耗情况。本文设计的XPIC可以有效消除双极化QAM信号因信道特性而产生的交叉极化干扰,相位同步模块的加入进一步保证了XPIC的正常工作,从而有效的提高了通信系统的抗干扰能力。
[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.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN973.3
本文编号：2184772
[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.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN973.3
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