radio environment meaning in English
射频骚扰
无线电环境
Examples
- Assigning serial different address code to different subscribers , useful signal is taken out of the same time slot and frequence , and is transmitted with one share channel . at received end , system makes use of completed address code from sending end to do correlative check and take out useful subscriber signal . the other address code signals are treated as broadband disturbing signal which is removed . in radio environment of existing variable disturbtion and muti - way declining , expand frequence signal ’ s broadband characteristics can improve system performance obviously . cdma mobile telecommunication system has some better characteristics , such as anti - disturbing 、 anti - way declining 、 secrecy 、 capacity 、 utilizing rate of frequence resource and so on , than other mobile telecommunication system
Cdma ( codedivisionmultipleaccess )移动通信系统的技术基础是基于扩频技术的码分多址,通过给不同的用户分配各自特定的地址码序列,将处于相同时隙和频率的用户信号分离开来,采用共享信道方式传输信息。在接收端,系统利用与发送端完全一致的本地地址码对接收信号进行相关检测,提取需要的用户信号,而将其他使用不同码型的信号视为宽带干扰而从中剔除掉。 - With the downlink simulation model constructed , performance of wideband cdma under different radio propagation environment and vehicular speed is simulated . based on system model of mc ds cdma under flat fading channel with relative shifts of spreading sequences within 1 chip and frequency selective fading channel with arbitrary relative chip shifts , performance of multicarrier cdma system with go sequences under different radio environment is investigated
基于多载波直接序列码分多址在乎坦衰落信道中序列偏移小于1个码片及在频率选择性衰落信道中偏移任意个码片的系统模型，本文还分析了采用广义正交序列的多载波码分多址系统在不同无线传播环境下的性能。 - Results obtained demonstrate that , due to the existence of zero - correlation - zone ( zcz ) of the go sequences , near ideal performance can still be achieved even when high speed radio environment is encountered . in addition , obvious interference mitigation as well as significant performance improvement can still be observed when the relative shifts of spreading sequences exceed zcz
研究表明，由于广义正交序列零相关区( zcz )的存在，即使处于高速运动无线环境，仍然可以取得近似理想性能，即使序列偏移超出了零相关区，仍然对干扰有明显的抑制作用，显著提高系统性能。