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matlab在通信系统中的常用例题。其中有AMI编码的功率谱,升余弦滚降系统,最佳升余弦滚降系统及误码率,多径传播。-matlab in the communication system used in the example. Among them, the power spectrum AMI coding or cosine roll-off system, the best or cosine roll-off system and the bit error rate, multipa
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CDMA扩频通信在多径时延展宽作用下的误码特性-CDMA spread spectrum communication in multipath time delay spread of the BER performance under
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RAKE的概念是由R.Price和P.E.Green在1958年的《多径信道中的一种通信技术》一文中提出来的。Rake的中文意思是:耙子,表明瑞克接收的过程相当于用一个钉耙将各个多径信号“耙”出来,然后加以收集。通常接收的多径信号时延差很小且是随机的,叠加后的多径信号一般很难分离,而只有特定设计的信号才可以进行分离,这种信号即扩频信号。分离的手段是相关接收-RAKE concept put forward in 1958 " a multipath channel communicati
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多径效应的时域表示实际上就是不同路径来的信号存在随机的时延差。对于抗其它扩频信号干扰性能,及抗多址干扰性能。我们这里考虑简单的情况,只考虑一个用户干扰的情况,说明其具有抗多址干扰性能就行。-Multipath effect is actually a time domain representation of the signal path to the existence of different random time delay difference. Other spread spect
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多径衰落信道中M进制直接序列扩频系统RAKE接收机性能分析-Multipath fading channels M-ary direct sequence spread spectrum system RAKE receiver performance analysis
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直接序列扩频,信道采用重复编码,2psk调制,针对白噪声,多径环境下的误码率仿真-Direct sequence spread spectrum, channel coding using repeated, 2psk modulation, for white noise, BER simulation of multipath environments
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Direct sequence spread spectrum (DSSS) communication systems has been widely
used in these years for its advantage of wide spectrum, low working Signal-to-Noise
ratio (SNR), anti-interference, anti-multipath effect and capability of LPI and LPD.
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采用m序列替代随机序列作为扩频码,仿真其性能;完成了与随机序列扩频性能之间的比较;完成无线多径ISI信道建模,在ISI信道下,研究了m序列与golden序列抗ISI的仿真误码率比较-M sequence used as a substitute random sequence spreading code, simulation of its performance, the completion of the comparison between the performance of rand
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衰落信道参数包括多径扩展和多普勒扩展。时不变的多径扩展相当于一个延时抽头滤波器,而多普勒扩展要注意多普勒功率谱密度,通常使用Jakes功率谱、高斯、均匀功率谱。-
The fading channel parameters include multipath spreading and Doppler spreading. The time-invariant multipath extension is equivalent to a delay-tap filter, while the
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被动时间反转镜和直接扩频相结合,有效克服多途环境。(The combination of passive time reversal mirror and direct spread spectrum can overcome multipath environment effectively.)
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①传输的数据随机产生,要求采用频带传输(BPSK调制);
②扩频码要求采用周期为63(或127)的m序列;
③仿真从基站发送数据到三个不同的用户,各不同用户分别进行数据接收;
④设计三种不同的功率延迟分布,从基站到达三个不同的用户分别经过多径衰落(路径数分别为2,3,4);
⑤三个用户接收端分别解出各自的数据并与发送前的数据进行差错比较。((1) the transmission data is randomly generated, requiring frequency band t
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