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MATLAB
接收端采用的算法和程序流程与发送端发送的OFDM符号的帧结构有关系。具体的帧结构,以及定时估计,频偏估计,剩余误差跟踪的算法可参考算法说明文档。这里对程序的流程进行说明。
首先根据短训练字的特性进行相关运算,进行信号到达检测,当检测到相关值大于门限一定次数后,认为有信号到达。然后根据长训练字的特性,进行相关运算,进行OFDM符号FFT窗口起始位置的估计。估计出FFT窗口的位置后,先在时域进行小频偏的估计,将两个长训练字进行小频偏补偿后,进行FFT运算,根据FFT运算的结果进行整数倍频偏的估计。这些参数估计完成后,就可以进行数据解调了。先对数据部分进行完整的频偏补偿,然后根据估计的FFT窗口位置进行FFT运算得到频域的数据,进行解调。然后在对应于导频的子载波位置上提取出导频信息,根据导频信息估计出剩余定时误差以及剩余的信道响应误差,将误差量送入环路进行跟踪。当收到所有数据后,重新回到信号到达检测状态,进行下一次信号到达的检测和信号接收。
(good)
- 2020-11-04 23:49:52下载
- 积分:1
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EMD
基于EMD分解的去噪算法以及HHT变换的各种用途(EMD decomposition based on denoising algorithm and HHT transform for a variety of purposes)
- 2021-04-13 22:28:55下载
- 积分:1
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ra
说明: repeat-accumulate codes (RA codes)
- 2017-03-24 15:05:21下载
- 积分:1
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一种基于高阶累积量的数字调相信号识别方法
说明: 对当前通信信号中常用的数字调相信号BPSK、QPSK、1/4一QPSK、8PSK的调制识别问题,提出了一种基于信号差分高阶累积量的识剐算法。该算法分两个层次进行调制识别,首先利用信号的四阶累积量特征对BPSK、QPSK和{1/4一QPSK、8PSK}信号进行识别,然后再利用信号差分的四阶和八阶累积量特征对1/4-QPSK、8PSK信号进行识别。从理论上分析了的该算法的有效性,并通过计算机仿真验证了算法具有良好的性能。(A recognition algorithm based on differential high-order cumulant is proposed for the modulation recognition problems of BPSK, QPSK, 1/4-QPSK and 8PSK, which are commonly used in current communication signals. The algorithm is divided into two levels for modulation recognition. Firstly, BPSK, QPSK and {1/4-QPSK, 8PSK} signals are identified by using the fourth-order cumulant characteristics of signals, and then 1/4-QPSK and 8PSK signals are identified by using the fourth-order cumulant and eighth-order cumulant characteristics of signal difference. The validity of the algorithm is analyzed theoretically, and the good performance of the algorithm is verified by computer simulation.)
- 2020-06-21 09:40:02下载
- 积分:1
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txxxxxx
一个关于IEEE802.15.4a信道原理的matlab编码(A on IEEE802.15.4a channel matlab coding)
- 2013-04-20 14:10:54下载
- 积分:1
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pi/4-dqpsk,可实现FPGA与电脑自发自收z_1 (2)
说明: pi/4-dqpsk,可实现FPGA与电脑自发自收(pi/4-dqpsk,It can realize the self receiving of computer and FPGA)
- 2020-07-19 19:43:33下载
- 积分:1
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WiMAX-LOS-and-NLOS-Technology
WIMAX LOS NLOS TECHNOLOGY WHITEPAPER
- 2009-04-03 07:03:38下载
- 积分:1
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LS_MMSE_SVD
说明: 可以比较两种信道估计算法的BER和均方误差(The BER and mean square error of the two channel estimation algorithms can be compared)
- 2021-04-21 15:58:49下载
- 积分:1
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IEC104NASlave
说明: C++开发104协议,支持主从站。支持多客户端连接(C++ develops 104 protocol to support master and slave stations. Support multi-client connection)
- 2020-06-21 04:20:02下载
- 积分:1
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simulink
关于通信系统的simulink仿真,包括基本介绍,数字信号传输,信道编码,OFDM方式,MIMO系统仿真(On the communication system simulink simulation, including a basic introduction to digital signal transmission, channel coding, OFDM mode, MIMO system simulation)
- 2013-10-14 10:41:04下载
- 积分:1