基于非单点模糊RBF网络的判决反馈均衡器

提出了一种具有较强抗突发干扰能力的非单点模糊径向基函数（Radial Basis Function,RBF）网络判决反馈均衡器.该方法将具有前置滤波特性的非单点模糊化技术引入RBF网络,利用梯度下降法自适应调整参数.通过仿真实验,并与基于径向基函数网络的判决反馈均衡器（Radial Basis Function Network-Decision Feedback Equalizer,RBFN-DFE）和传统判决反馈均衡器（Decision Feedback Equalizer,DFE）进行比较,结果证明该方法抗突发干扰能力强,误码性能好.     

基于遗传优化的正交小波分数间隔盲均衡算法

针对传统的常数模盲均衡算法(CMA)收敛速度慢、稳态误差大和局部收敛的缺点,提出了一种基于遗传优化的正交小波分数间隔盲均衡算法(WT-FSE-GA).该算法通过对分数间隔均衡器的输入信号进行正交小波变换,以降低信号的自相关性,并利用遗传算法全局随机搜索的特性,对均衡器权向量进行优化,以降低CMA陷入局部收敛的可能性.与...     

基于SOC的电池均衡控制技术的仿真研究

提出了一种电感电流临界模式的均衡控制策略,设计了基于SOC的磷酸铁锂电池均衡控制系统,由主控CPU模块控制MOSFET开关管的导通与否,将能量从电池组中SOC最高的电池传递到SOC最低的电池,最后达到每节电池有相同的SOC。采用matlab/simulink进行系统建模和仿真,结果表明电池组无论处于充放电状态还是处于静置状态都能达到良好的SOC均衡效果。     

一种无源双基地雷达直达波恢复方法研究

在山地及城市附近的应用中,严重的多径杂波造成基于调频广播的无源双基地雷达直达波信号恢复困难。文中提出了采用基于空间分集的常数模盲均衡算法,利用空间分集的多通道,实现信号衰落的补偿,而利用常数模盲均衡算法,实现恒模的调频广播信号的反卷积运算,从而完成了对多径的抑制,获得高质量的直达波信号。计算机仿真表明：与无分集的常数模盲均衡算法相比,所提算法获得了更好的目标检测性能。     

Iterative nonlinear detection for SFBC SC–FDMA uplink MIMO transmission systems

Single‐carrier frequency division multiple access (SC‐FDMA) systems with space frequency block coding (SFBC) transmissions achieve both spatial and frequency diversity gains in wireless communications. However, SFBC SC‐FDMA schemes using linear detectors suffer from severe performance deterioration because of noise enhancement propagation and additive noise presence in the detected output. Both issues are similar to inter‐symbol‐interference (ISI). Traditionally, SC‐FDMA system decision feedback equalizer (DFE) is often used to eliminate ISI caused by multipath propagation. This article proposes frequency domain turbo equalization based on nonlinear multiuser detection for uplink SFBC SC‐FDMA transmission systems. The presented iterative receiver performs equalization with soft decisions feedback for ISI mitigation. Its coefficients are derived using minimum mean squared error criteria. The receiver configuration study is Alamouti's SFBC with two transmit and two receive antennas. New receiver approach is compared with the recently proposed suboptimal linear detector for SFBC SC‐FDMA systems. Simulation results confirm that the performance of the proposed iterative detection outperforms conventional detection techniques. After a few iterations, bit‐error‐rate performance of the proposed receiver design is closely to the matched filter bound. Copyright © 2016 John Wiley & Sons, Ltd.     

宽带无线TDMA系统的自适应调制技术

无线多媒体业务的快速增长促进了宽带无线ＴＤＭＡ通信系统的研究和开发,宽带无线ＴＤＭＡ通信系统方面出现了一些新的技术和系统设计概念。讨论宽带无线ＴＤＭＡ系统中采用的自适应调制技术。     

基于MBER准则的变阶长自适应均衡器

提出了基于最小误比特率（MBER）准则的变阶长自适应均衡算法--FT-MBER算法。变阶长自适应均衡是未知多径信道均衡的重要技术,准确估计自适应均衡器最佳阶长能同时实现低复杂度和较好的均衡性能,而传统的最小均方误差（MMSE）算法稳态误比特率性能不理想。FT-MBER算法以最小化BER为代价函数,把不同阶长均衡器产生的误比特率之差作为因子调节伪分数阶长,当伪分数阶长变化大于阈值时更新阶长。仿真结果表明该算法比MMSE算法能更有效抑制码间干扰并能准确估计MBER准则下的均衡器最佳阶长。     

Determining the optimal decision delay parameter for a linear equalizer

1 Introduction Equalization techniques play an ever-increasing role in combating distortion and interference in mod- ern communication links[1,2]. It is well-known that the choice of equalizer decision delay parameter crit- ically determines achievable bit error rate (BER) performance[3,4]. We present a simple and e?ective method for determining an optimal decision delay pa- rameter that results in the best bit error rate perfor- mance for a linear equalizer. The proposed technique computes …     

合成绝缘子均压环安装方式的研究

介绍了合成绝缘子均压环的作用及正确安装使用方法,重点说明开口均压环环的特点及使用方法。     

整流柜均流系数测算方法的改进

传统的整流柜均流系数测算需要工作人员在正常运行或电流升高的整流柜上测量快熔两端的毫伏压降,这对测试人员和整流柜来说都存在较高的危险。使用红外线测温仪可以随时检查每条桥臂上整流元件和快熔的运行情况,套用计算均流系数的公式可以计算桥臂的温度系数,跟踪桥臂的均流变化情况,比传统的方法更安全、简便。