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[Linux-Unix] ofdm-tge DL : 0: OFDM程序，这么安排矩阵的目的是为了构造共轭对称矩阵共轭对称矩阵的特点是在ifft/fft的矢量上 N点的矢量在0，N/2点必须是实数一般选为0 1至N/2点与（N/2）+1至N-1点关于N/2共轭对称- BPSK simulation using a carrier cosine wave with ISI clc close all clear all figure(1) n=160 for i=1:n data(i)= 2*round(rand)-1 end create modulated BPSK signal first expand the bit stream exdata=[] for i=1:length(data) for rep=1:5 exdata= [exdata data(i)] end end ts=.1 t=1:ts:80.9 carrier=cos(pi*t) multiply expanded bitstream by cosine wave with carrier frequency this is the BPSK that is to be transmitted over the channel bpsk=carrier.*exdata bpsk=[bpsk(length(bpsk)-1) bpsk(length(bpsk)) bpsk] plot(bpsk) generating the noise p=rand(1,800)*2*pi p=rand*2*pi snr=10 r=sqrt(-1*(1/snr*log(1- rand))) no = 5*(r.* exp(j*p)) no = (r.* exp(j*p)) value of alpha al=rand+j*rand al=1 Spreading channel with the alpha as the variable for k=5:5:795 for l = 1:5 al=round(rand)+j*round(rand) rec(k+l)=bpsk(k+l)+al*bpsk(k-5+l) end end rxdata=rec+ no begin demodulation first multiply recie
Date : 2026-01-08 Size : 5.86mb User : 卞敏捷
[Linux-Unix] SAC DL : 0: OFDM(Orthogonal Frequency Division Multiplexing)即正交频分复用技术，实际上OFDM是MCM(Multi Carrier Modulation)，多载波调制的一种。 OFDM技术由MCM（Multi-Carrier Modulation，多载波调制）发展而来。OFDM技术是多载波传输方案的实现方式之一，它的调制和解调是分别基于IFFT和FFT来实现的，是实现复杂度最低、应用最广的一种多载波传输方案。在通信系统中，信道所能提供的带宽通常比传送一路信号所需的带宽要宽得多。如果一个信道只传送一路信号是非常浪费的，为了能够充分利用信道的带宽，就可以采用频分复用的方法。-OFDM (Orthogonal Frequency Division Multiplexing) that is orthogonal frequency division multiplexing, OFDM is a fact MCM (Multi Carrier Modulation), multi-carrier modulation. OFDM technology was developed by MCM (Multi-Carrier Modulation, multi-carrier modulation) evolved. OFDM technology is one way to achieve a multi-carrier transmission scheme, its modulation and demodulation, respectively, based on IFFT and FFT to achieve, is to achieve the least complex, the most widely used of a multi-carrier transmission scheme. In the communication system, the bandwidth of the channel can provide is usually higher than the bandwidth required to transmit a signal all the way to much wider. If a channel carries only one signal is very wasteful, in order to take full advantage of the bandwidth of the channel, you can use frequency division multiplexing method.
Date : 2026-01-08 Size : 14kb User : wanghuan
[Linux-Unix] 287430 DL : 0: OFDM help material for channel estimation div hr div B 文件列表 B ： div di()
Date : 2026-01-08 Size : 102kb User : tequirvmests