Performance analysis of anti multi - path interference of smart antenna technique 智能天线技术的抗多径干扰性能分析
Channel estimation is one of the key features of this technique and will lead to the better performance of rake receiver Rake接收机作为一种有效的抗多径技术,实现多径分集接收功能。
It has many advantages , for example high transmission rate , low power consumption , good security , robustness to multipath and low cost 利用纳秒级的非正弦波窄脉冲来传输数据,具有传输速率高、功耗低、安全性好、抗多径能力强以及成本低廉等许多优点。
This paper concentrates on the orthogonal frequency division multiplexing ( ofdm ) technique and some techniques to resist multipath fading . it also simulates by computer 本文主要研究正交频分复用( ofdm )及其抗多径衰落的一些技术,并利用计算机进行仿真。
Furthermore , it become more and more important in commercial wireless communication because it can reduce the effects imposed by multi - path fading and co - channel interference 另外,跳频通信也应用到民用通信中以抗衰落、抗多径、抗网间干扰和提高频谱利用率。
Multicarrier orthogonal frequency - division multiplexing ( ofdm ) systems have been widely researched in recent years because of its good anti - multipath characteristic when easily equalized 摘要近年来,多载波ofdm系统因其均衡简单且能有效地抗多径干扰而受到广泛地研究。
The spread spectrum ( ss ) communication system has stronger ability of resisting jamming , narrow band , and multipath interference than that of the conservation communication systems 扩频通信系统与常规的通信系统相比,具有很强的抗人为干扰,抗窄带干扰,抗多径干扰的能力。
So cdma is irrefutablely competitive . however , the capacity of conventional cdma communication system is confined by multi - access interference ( mai ) and multi - path interference ( mpi ) 但是cdma的容量却受限于多址干扰与多径干扰,而多载波技术具有很强的抗多径干扰的能力。
The advantages of spread spectrum communication are as follows : low probability of intercept , good anti - fading and anti - multipath interference capability . it is widely used in military and civil communication 扩频通信具有低截获率、抗衰落能力强、抗多径干扰等优点,广泛应用于军事通信和民用通信。
Ofdm , with the advantage of high spectrum efficiency and easy realization , can strongly combat multi - path and dispersive channel interference , so its application is remarkable in recent years 正交频分复用( ofdm )技术具有抗多径时延、抗信道衰落、频谱利用率高、硬件实现简单等优点,近年来受到广泛关注。