基于TMS320F28234的SVPWM等效方法在逆变系统中的应用

基于两电平情况下,分析SVPWM与载波PWM之间的相互关系,得出SVPWM的基于载波PWM的统一实现方法,给出算法流程图并进行仿真。最后通过基于DSP（TMS320F28234）的逆变电路分别进行开环逆变实验和有源逆变闭环实验。结果证明了该等效方法在逆变系统中的应用是切实可行的。     

多进制正交扩频技术在矿井下的应用

针对传统的通信方式无法适用于矿井下的复杂环境,采用多进制正交扩频技术实现矿井下通信。通过对多进制正交扩频系统性能的仿真和分析,多进制正交扩频通信系统具有抗干扰能力强、传输距离远和自适应性强等优点,具有广泛的应用性,适应于矿井下进行通信。     

双伪随机序列扩频(DPN-SS)在HFC中的应用研究

针对HFC上行通信严重受到随机的窄带干扰和多址干扰，多用户接入和通信的MAC协议复杂难题，提出了双伪序列扩频(DPN—SS)多址方式的解决方案，阐述了其工作的基本原理。     

Reduction of wireless signals in indoor environments by using an active frequency selective wall based on spectrum sensing

This paper presents a wireless local area network (WLAN) spectrum control system that uses active frequency selective shielding walls to selectively reduce or pass WLAN signals in the 5 GHz band indoors. The proposed system utilizes a well‐known active frequency selective structure based on a rectangular loop with PIN diodes and is thus capable of either reducing or passing the WLAN frequency by using the on/off switching of the PIN diode based on the measured electric field strength in indoor. We designed and simulated the proposed active frequency selective shielding wallpaper by using commercial electromagnetic simulation software and confirmed that the proposed structure can reduce the WLAN signal by switching the PIN diode by applying the manufactured prototype on the exterior of an experimental apparatus containing a WLAN receiver antenna that is capable of measuring the received electric field strength. Extension of the results presented herein can be applied to reduce the wireless signal to enhance the spectrum efficiency of an indoor space.