摘要
针对电力线信道中的频率弥散特性,研究了采用不同的子载波基对系统抗干扰性能的影响,提出以小波包函数替代正交频分复用(OFDM)中的正弦基作为子载波基进行传输的技术,利用其正交性来对抗电力线信道中的多径干扰与频率选择性衰落特性。通过仿真,分析了采用不同小波包基的小波包调制与OFDM的抗干扰性能,结果表明:在信噪比达到一定值时,正交小波包调制技术的抗干扰性能优于半正交小波包调制及OFDM技术。
To solve the frequency dispersive feature in powerline channel,the quthors analyzed the anti-interference performance of modulation schemes with different subcarrier bases,and use orthogonal wavelet packet as subcarrier base instead of sine base in OFDM to suppress multi-path effect and frequency selective fading by its orthogonality in powerline channel.Through experiment,performances of wavelet packet modulation with different wavelet packets and OFDM are analyzed.Experiment results indicate that when the SNR has reached a certain level,orthogonal wavelet packet modulation has better performance than bi-orthogonal wavelet packet and sine base.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第4期130-133,共4页
Journal of Chongqing University
基金
重庆市自然科学基金资助项目(CSTC2010BB2320)
重庆市教委科技研究资助项目(KJ100810)
关键词
电力线通信
子载波基
小波包调制(WPM)
正交频分复用
powerline communication
subcarrier bases
wavelet packet modulation
orthogonal frequency division multiplexing
