BPSK stands for Binary Phase Shift Keying. It is a type of digital modulation technique used in digital communications. In BPSK, the phase of a carrier signal is changed to represent two different binary digits or symbols (0 or 1). The phase of the carrier signal is shifted 180 degrees to represent a binary “1”, and is not shifted to represent a binary “0”. BPSK is a simple and robust modulation technique that is widely used in wireless communication systems due to its low complexity and ease of implementation. It is also known to be a very resilient to noise, thus making it a popular choice for long-distance wireless communications.
BPSK (Binary Phase Shift Keying) is a digital modulation technique that uses a carrier signal with two different phase states, 0 and 180 degrees, to represent binary data (0 or 1).
In MATLAB, one way to implement BPSK modulation is by first generating a binary data sequence of 0s and 1s. Then, using a carrier signal at a specific frequency, the phase of the carrier is shifted by 180 degrees to represent a binary “1”, and is not shifted to represent a binary “0”. The modulated signal can be created by multiplying the binary data sequence with the carrier signal.
clc; clear all; close all; %fine Transmitted Signal= N=10; x_inp=round(rand(1,N)); % Message Signal Tb=0.0001; % Bit Period %Represent Input Signal as Digital Signal x_bit=; nb=100; for n=1:1:N if x_inp(n)==1 x_bitt=ones(1,nb); else x_bitt=zeros(1,nb); end x_bit=[x_bit x_bitt]; end t1=Tb/nb:Tb/nb:nb*N*(Tb/nb); f1=figure(1); set(f1,'color',[1 1 1]); subplot(3,1,1); plot(t1,x_bit,'LineWidth',2); grid on; axis([0 Tb*N -0.5 1.5]); ylabel('Amplitude(volt)'); xlabel('Time(sec)'); title('Input Signal as Digital Signal'); %fine BPSK Modulation Ac=10; mc=4; fc=mc*(1/Tb); fi1=0; fi2=pi; t2=Tb/nb:Tb/nb:Tb; t2L=length(t2); x_mod=; for i=1:1:N if x_inp(i)==1 x_mod0=Ac*cos(2*pi*fc*t2+fi1); else x_mod0=Ac*cos(2*pi*fc*t2+fi2); end x_mod=[x_mod x_mod0]; end t3=Tb/nb:Tb/nb:Tb*N; subplot(3,1,2); plot(t3,x_mod); xlabel('Time(sec)'); ylabel('Amplitude(volt)'); title('Signal of BPSK modulation'); %Transmitted Signal x x=x_mod; h=1; w=0; %Received Signal y=h.*x+w; %BPSK Demodulation y_dem=; for n=t2L:t2L:length(y) t=Tb/nb:Tb/nb:Tb; c=cos(2*pi*fc*t); y_dem0=c.*y((n-(t2L-1)):n); t4=Tb/nb:Tb/nb:Tb; z=trapz(t4,y_dem0); A_dem=round((2*z/Tb)); if(A_dem>Ac/2) A=1; else A=0; end y_dem=[y_dem A]; end x_out=y_dem; %Represent output signal as Digital Signal xx_bit=; for n=1:length(x_out) if x_out(n)==1 xx_bitt=ones(1,nb); else xx_bitt=zeros(1,nb); end xx_bit=[xx_bit xx_bitt]; end t4=Tb/nb:Tb/nb:nb*length(x_out)*(Tb/nb); subplot(3,1,3) plot(t4,xx_bit,'LineWidth',2); grid on; axis([0 Tb*length(x_out) -0.5 1.5]); ylabel('Amplitude(volt)'); xlabel('Time(sec)'); title('Output Signal as Digital Signal');
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