MATLAB Code for QPSK Modulation and Demodulation 因为在学习5G物理层，一直很忙，没有时间。最近稍有...
The code snippet provided in the previous section demonstrates how QPSK modulation and demodulation can be implemented using MATLAB. The code generates a random QPSK modulated signal, displays the signal in a scatter plot, and then performs QPSK demodulation to recover the original digital data. The...
扩频通信技术具有很多独特的优点:具有抗干扰能力强和截获率低等独特优点,而且具备码分多址(CDMA,Code Divided Multiple Access)或称为扩频多址(SSMA,SpreadSpectrumMultiple Access)的能力,因此广泛应用于商业、银行、宾馆、能源和交通业等行业。因为应用广泛受到世界各国的特别关注,尤其是在近年来随着超大规模的集成电路...
ofdm.Mod = 4; % QPSK Modulation ofdm.PSpace = 1; % pilot space between two pilots % channel parameters chan.SNR_dB = 15; % signal to noise ratio chan.L = 6; % number of channel taps between each transmit-receive antenna % control parameters ofdm.ifDemodulateData = 1; % (1,0) if...
Trans_BPSK = QAM64_modulation(dsss); %通过高斯信道 Rec_BPSK = awgn(Trans_BPSK,SNR(i),'measured'); ReData = QAM64_demodulation(Rec_BPSK); %DSSS dsss2 = func_dsss2(ReData,pseudoNumber,fp); x_hat = round([dsss2+1]/2); [nberr,rat]= biterr(x_hat,Trans_data); ...
QPSK调制: QPSK调制将每两个比特映射到一个复平面上的相位点。假设接收到的解扩信号为r_I[n]和r_Q[n],则QPSK调制后的信号为x[n] = r_I[n] + j*r_Q[n],其中j为虚数单位。 16QAM调制: 16QAM调制将每四个比特映射到一个复平面上的相位点。假设接收到的解扩信号为r_I[n]和r_Q[n],则16QAM调制...
Perform Soft-Decision Demodulation Create QPSK equivalent signal to align in-phase and quadrature. Get impairedQPSK = complex( ... real(impairedSig(1+sps/2:end-sps/2)), ... imag(impairedSig(sps+1:end))); Apply matched filtering to the received OQPSK signal. Get halfSinePulse = sin(...
图2-8 QPSK产生方法—选择法 解调方法(如图2-9) 2.2.3同步 按照同步的功用分为:载波同步、位同步、群同步和网同步。 载波同步是指在相干解调时,接收端需要提供一个与接收信号中的调制载波严格同频同相的相干载波。在模拟调制和数字调制中,要想实现相干解调,必须有相干载波。因此,载波同步是实现相干解调的先决条...
% modulation using a complex baseband equivalent representation of the % signal modulated on a carrier. It also demonstrates demodulation and % detection of the signal in the presence of additive white Gaussian % noise for quaternary phase shift keying (QPSK). EbNo is a vector that ...
在数字通信系统中,调制解调技术包括多种形式,如QAM、QPSK、FSK等。 QAM(Quadrature Amplitude Modulation)是一种基于相位和幅度联合调制的数字调制技术。在MATLAB中,可以使用comm.QAMModulator和comm.QAMDemodulator函数来实现QAM调制解调。下面是一个简单的QAM调制解调仿真设计的例子: modulator = comm.QAMModulator(...