基于环正交腔体噪声消除的OFDM网络信号误差限制算法

发布时间：2019-08-24 15:46

【摘要】：为解决当前OFDM网络信号误差限制算法难以消除窄带莱斯噪声干扰,且单纯采用一次发射机制存在精度较低等问题,提出了一种基于环正交腔体噪声消除机制的OFDM网络信号误差限制算法.首先,对OFDM信号进行离散化,并依据信号投影矢量及窄带莱斯噪声投影矢量在全频谱上的投影,按极坐标旋转方式构建了环正交腔体噪声消除结构,实现了信号投影矢量与窄带莱斯噪声投影矢量的正交分离,提高了信号投影矢量的投影效率,减少信号投影矢量与噪声投影矢量的重叠现象,降低了信号发射过程中出现的信号衰落水平;随后,依据信源信号投影矢量与信道状态投影矢量的夹角误差,采取极大似然估计,构建矢量角度误差控制机制,并通过拉普拉斯窗函数估计方法,进一步改善了信道传输过程中的角度衰落,降低了传输误码率.仿真实验表明:与当前常用的矢量线性积分误差消除机制(Vector Integral Error Elimination Mechanism,VIEE机制)及预发射累计误差控制机制(Prelaunch Accumulative Error Control Mechanism,PAEC机制)相比,本文算法具有更低的传输误码率与更强的抗衰落性能.
[Abstract]:In order to solve the problem that the current OFDM network signal error restriction algorithm is difficult to eliminate narrowband Rice noise interference, and the accuracy is low by using only one transmission mechanism, a signal error restriction algorithm for OFDM network based on ring orthogonal cavity noise cancellation mechanism is proposed. Firstly, the OFDM signal is discretized, and according to the projection of the signal projection vector and narrowband Rice noise projection vector on the full spectrum, the ring orthogonal cavity noise elimination structure is constructed according to the polar coordinate rotation mode, the orthogonal separation of the signal projection vector and the narrowband Rice noise projection vector is realized, the projection efficiency of the signal projection vector is improved, and the overlap between the signal projection vector and the noise projection vector is reduced. The signal fading level in the process of signal transmission is reduced. Then, according to the angle error between the source signal projection vector and the channel state projection vector, the maximum likelihood estimation is adopted to construct the vector angle error control mechanism, and the Laplacian window function estimation method is used to further improve the angle fading in the channel transmission process and reduce the transmission error rate. The simulation results show that the proposed algorithm has lower transmission error rate and stronger anti-fading performance than the current vector linear integral error elimination mechanism (Vector Integral Error Elimination Mechanism,VIEE mechanism) and the pre-emission cumulative error control mechanism (Prelaunch Accumulative Error Control Mechanism,PAEC mechanism).
【作者单位】：湖南财经工业职业技术学院电子信息系;湖南科技大学计算机科学与工程学院;
【基金】：湖南省自然科学基金项目(14JJ10209)
【分类号】：TN929.53

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