摘要
离散多音调制(DMT)信号的频谱旁瓣功率过大,在噪声环境和信道特性变化的情况下会影响系统的传输性能。离散小波多音调制(DWMT)采用离散小波变换来代替DMT中的离散傅立叶变换,通过仔细地设计调制信号的频谱特性来提高系统的传输性能。文中在介绍DWMT技术基本原理的基础上,对DWMT系统的关键技术(比特与能量分配算法、基带滤波器设计等)进行了分析研究。通过对DWMT与DMT进行性能上的比较,说明DWMT性能优于DMT,有望用于宽带接入网技术。
The overgreat power of side lobe of frequecy spectrum of DMT signal will decline the transmission performance of system in the case of noise environment and channel variationsThe discrete wavelet(DWMT)is adopted to substitute the discrete Fourier transform in DMTThe transmission performance of the system is improved by carefully designing the spectral characteristic of modulation signalThis paper introduces the basic principle of DWMT and analyzes the key techniques of DWMT(bit loading algorithm,baseband filter design,etc)This paper demonstrates that DWMT is superior to DMT in performance by making a comparison in performancee between them and that DWMT Technique has potentialites in broadband access network
出处
《空军工程大学学报（自然科学版）》
CSCD
2003年第1期38-42,共5页
Journal of Air Force Engineering University(Natural Science Edition)
