摘要
在多径衰落信道上高速传送信号时,如果信道的延迟扩展大于发送信号的符号周期,信号将产生频率选择性衰落并引起符号间干扰,但如果信道的延迟扩展小于发送信号的符号周期,信号只会产生衰落而不会引起符号间干扰。文中从信道的随机过程特征出发,通过模拟信道的平稳过程,讨论信道衰落特征,为数字通讯的编码、调制和信道的均衡器设计提供一种可行的数学模型,进而可以加快数字通讯新方法的研发。
When signal is rapidly transmitted in the multi-path fading channel, if the delay expanding of the channel is longer than the sign period of transmitted signal, the signal transmitting will lead to frequency selective fading and ISI （Intersymbol interference）, but if the delay expanding of the channel is shorter than the sign period of transmitted signal, the signal transmitting will lead only to fading, not to ISI. By means of the stochastic character of the channel and through simulating the stationary stochastic process of the channel, we dive into discussing the fading character of the channel. This simulation forms a useful mathematic model and an effective platform for studying the coding techniques, modulation and the design of equalizer in the field of digital communication. Furthermore, the channel simulation can facilitate the findings of some new methods for digital communication.
出处
《南京工业大学学报（自然科学版）》
CAS
2006年第2期19-22,共4页
Journal of Nanjing Tech University(Natural Science Edition)
基金
江苏省高校自然科学基金资助(03KJB110037)
