ofdm modulation

The principle of GMSK modulation is very simple.is the Gauss filter before the MSK modulation.In the implementation there are such methods, first producing Gaussian coefficients, symmetrical ascending and descending po coefficients. Input a symbol, carry on the sampling, pass the Gaussian filter, the output of the filter does the symbolic summation.The accumulated output is compared with the upper and lower values, i.e. the value greater than pi minus

This is my maiden post, will also write more ICT blog. Today for everyone presented MATLAB simulation BPSK modulation of the codes:Clear ALL;CLC;Snr_db=1:1:9;snr=10.^ (SNR_DB./10);Size=length (snr_db);A=ones (1,size);% fixed a, variable sigma definedSigma=sqrt (1./(2*snr));%a=1n=10000;S=randi ([0,1],1,n);s1=2*s-1;S2=zeros (1,n);N_errb=zeros (1,size);For I=1:1:sizeN=sigma (i). *RANDN (1,n);Y=s1+n;For J=1:1:nIf Y (j) >0S2 (j) = 1;Else Y (j) S2 (j) = 0;E

Fc = 10; % carrier FS = 40; % SYSTEM sampling frequency FD = 1; % code rate N = FS/FD; df = 10; numsymb = 25; % simulation Information Code Count m = 2; % hexadecimal snrpbit = 60; % SNR = snrpbit/log2 (m); seed = [12345 54321]; numplot = 25; % ================== generate 25 Binary Random codes x = randsrc (numsymb, 1, [0: M-1]); % generate 25 Binary Random codes figure (1) stem ([0: numPlot-1], x (1: numplot), 'bx '); Title ('binary random sequence ') xlabel ('time'); ylabel ('samples'); % ====

Digital signal divided into baseband transmission and band-pass transmission Band-pass transmission is the modulation of baseband signals Why baseband modulation is needed: In practice, most channels (such as wireless channels) have band-pass characteristics and cannot transmit baseband signals directly, because digital baseband signals tend to have rich low-frequency components In order for the digit

Tags: style blog http io color ar os for SPI. QPSKorthogonal Phase shift keying (quadrature Phase Shift keying) is referred to as "QPSK" and is a digital modulation method. It is divided into two kinds: absolute phase shift and relative phase shift. Because of the phase ambiguity problem in the absolute phase shift, the relative shift phase is used to dqpsk the method. It has been widely used in wireless communication and has become a very important

RFID modulation and EncodingModulationSound is converted to electricity by a telephone and then transmitted as an analog signal.These waves has 3 fundamental characteristics: Amplitude, meaning the height (intensity) of the wave Frequency, which is the number of waves this pass in a single second and was measured in Hertz (cycles/second) (Wavelength, The length of the wave from crest to crest, was related to frequency.). Phase is a th

The clear all;%% DSB modulation% DSB (bilateral band) simply multiplies the modulated signal m (t) and the carrier signal cos (WT) to dt=1/800; T = $; The total time of the% sample. Spectral resolution (DF=1/T). t = 0:DT:T-DT;FM = 2; % modulated signal frequency, Unit KHZFC = 20; The frequency of the% carrier signal, Unit khzm = cos (2*pi*fm*t); % modulated signal s = m.*cos (2*pi*fc*t); %DSB modulated signal [F,SF] = T2F (t,s), figure (1) plot (t,s)

code. Bipolar rectangular pulse: The pulse level is positive (0 yards), negative (1 yards), positive and negative occurrence probability is equal. Unipolar Zero Code: relative to the NRZ code, 1 yards (pulse) occurs less than the width of the code element, so it can come back to 0 yards before the next code element--it is called Zero code. Manchester Special code: With the pulse between the positive and negative jumps to represent the digital signal, is minus 1 yards, minus, and is 0 y

as loading remote files. The convenience of using this language comes at a cost: You need to learn a new language and remember another way to form a web application. The old keyword "Void" is rewritten as "Void", and "V" must be capitalized. However, the definition of these keywords is automatically obtained from the function without explicit typing, this is quite convenient. In addition, there are some good syntaxes. After some experiments, I found that I couldn't stand it in some ways. I bega

Public Static voidMain (string[] args) {TenHello ("Hello"); One for(String S:args) Hello (s); A } -}2. Use javah-jni Hello command to generate Hello.h1 /*Do not EDIT this file-it are machine generated*/2#include 3 /*Header for Class Hello*/4 5 #ifndef _included_hello6 #define_included_hello7 #ifdef __cplusplus8 extern "C" {9 #endifTen /* One * Class:hello A * Method:hello - * Signature: (ljava/lang/string;) V - */ theJniexportvoidJnicall Java_hello_hello -(JNIENV *, Jclass, j

 calculation of MCS, modulation order, encoding rate, spectral efficiency relationship table Reference URL: http://4g-lte-world.blogspot.tw/2012/12/transport-block-size-code-rate-protocol.html Reference URL: http://blog.richliu.com/2013/10/22/1545/ (1) Premises: Therefore, the efficiency can be simplified to the following formula: tbs= size of the transfer block (table 7.1.7.2.1-1) crc= the number of bits that are attached for error checking =24