Description: 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, multipath spread. Platform: |
Size: 5120 |
Author:陈琛 |
Hits:
Description: 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 Platform: |
Size: 62464 |
Author:dukeliu |
Hits:
Description: 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 communication technology by R.Price and PEGreen. Rake the Chinese meaning is: rake that Rick received equivalent with a rake " rake" multipath signal out, and then to be collected. Usually received multipath signal delay difference is small and is random, and the multipath signals superimposed generally difficult to isolate, and only the specific design of the signal can be separated, such a signal, i.e., the spread spectrum signal. Means of separation is a correlation receiver Platform: |
Size: 2048 |
Author:jingjing |
Hits:
Description: 本书内容包括随机和伪随机信号的产生伪随机信号的同步，多径和多址干扰下扩频信号的调翻和解调，编码与交织，容量、，盖及扩频多址网络的控制.
本书可供从事电信工作，特别是从事移动通信工作的技术人员和管理人员阅读.也可作为通信院校相关专业的师生的参考读物-This book includes random and pseudo-random signal generating pseudo-random signal synchronization, multipath interference and multiple access spread spectrum signal modulation and demodulation turn, coding and interleaving, capacity, cover and spread spectrum multiple access network control book available in the telecommunications work, particularly those engaged in the work of the mobile communication technology and management staff to read can also be used as the communication of relevant professional institutions and students of readings Platform: |
Size: 3771392 |
Author:cyz |
Hits:
Description: 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 spectrum signal for the anti-interference performance, and anti-MAI performance. Here we consider the simplest case, considering only one user interference, indicating its performance with anti-multiple access interference on the line. Platform: |
Size: 2048 |
Author:小多 |
Hits:
Description: 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.
They are increasingly replacing conventional communication forms and obtaining
extensively applications in modern military and commercial communication systems,
for example, CDMA communication system, GPS , measuring and control system,
satellite chain, identification of friend or foe and etc. Therefore, corresponding DSSS
electronic counter technique becomes a big problem to solve in electronic warfare
domain. DSSS electronic counter technique including blind detection, blind parameter
estimation and spreading sequences estimation. For the issue of DSSS electronic
counter technique of DSSS/QPSK signal damaged by strong additive white Gaussian
noise (AWGN), the main research content in this dissertation as follow.
Platform: |
Size: 2061312 |
Author:yangs |
Hits:
Description: 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 random-sequence spread spectrum, complete the wireless multipath channel model ISI, ISI channel under study the m sequence and golden sequence of the anti ISI BER simulation comparison Platform: |
Size: 5120 |
Author:许乐 |
Hits:
Description: 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 Doppler spread should pay attention to Doppler power spectral density, usually using Jakes power spectrum, Gaussian, and uniform power spectrum. Platform: |
Size: 2048 |
Author:刘旺 |
Hits:
Description: 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.) Platform: |
Size: 7168 |
Author:LyrenLeigh
|
Hits:
Description: 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 transmission (BPSK modulation).
2. The spread spectrum code requires the m sequence of 63 (or 127) cycles.
Simulation sends data from base station to three different users, and different users receive data separately.
Three different power delay distributions are designed, and three different users from base stations reach multipath fading respectively (path number is 2, 3, 4) respectively.
Three users receive their respective data separately and compare them with the data before sending.) Platform: |
Size: 2048 |
Author:这名字真难取 |
Hits:
Search - spread spectrum multipath