qpsk modulation

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 co

PCM (Pulse-code modulation) Pulse coding modulation, pcm Pulse Coding modulation In audio processing, we often hear PCM data. What is PCM Data?PCM data is a digital signal after the analog signal passes through PCM. PCM is the process of converting the audio signal from analog signal (time continuous, value continuous) to digital signal (time discrete, value dis

obtained by the minimum modulation index (0.5) quadrature signal, and "fast" refers to the given same frequency band, the MSK can be higher than the 2PSK data transmission rate, and in the band outside the spectral component is faster than the 2PSK attenuation. The MSK signal has the following characteristics:1. The MSK signal is a constant envelope signal;2. At the time of the code element conversion, the phase of the signal is continuous, and the s

 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

Communication Algorithm 7: Communication System Algorithm Design, bit rate, spread spectrum, modulation method algorithm selection, communication system modulation method 1. Rate Matching: Bit Rate Selection Channel environment: AWGN Signal-to-Noise Ratio: SNR Bit Rate R: 1/2, 1/3, 1/4, 1/8 MATALB simulation architecture: Source bit + convolution code/Turbo (1/3) + Rate Matching (different R) + PSK

Ask modulation simulation circuit:Device Selection:Select the signal source of the voltage-controlled sine wave in the sources->controlled_valtage_sources->voltage_controlled_sine_wave.Parameter settings:Set the signal generator to produce 1KHz, duty-free ratio 50%, amplitude of 5V square wave signal.Set the voltage control sine wave signal source control array -5v corresponding frequency 0hz,5v corresponds to 10khz,output peak low value = 0v,output P

FM) by analyzing the variation in amplitude or fre Quency. The same rules of amplitude and frequency variations is followed when transmitting or receiving the data signal.From the above methods of AM and FM modulations different forms of radio modulations is derived. The On-off keying (OOK) technique described above is a derived form of AM modulation.Frequency hopping Spread Spectrum (FHSS) is a advanced form of FM modulation. Other

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

A. 4FSK principleDMR System, digital trunking communication system. The DMR protocol adopts a modulation mode of 4FSK, which is a constant envelope modulation, which transmits 2,400 symbols per second and each symbol carries two bits of information. The maximum frequency offset d is defined as follows:d = 3h/2t,h represents the frequency offset factor for each modulatio