목차
1-(a) hadamard code 를 통한 matched filter 구현
1-(b) Convolution 의 원리 구현
2-(a) DS-CDMA 통신망에서의 Error Probability
2-(b) 8 user CDMA 통신망 구현
1-(b) Convolution 의 원리 구현
2-(a) DS-CDMA 통신망에서의 Error Probability
2-(b) 8 user CDMA 통신망 구현
본문내용
or;
end
zt=[zt I];
end
a2=[0:0.01:14]; %x axis - DB scale
plot(a2,zt)
xlabel('SNR(dB)')
ylabel('P_e')
ylabel('Bit Error Probability, P_{e,k}')
grid
legend('user-1','user-2','user3','user-4','user-5','user-6','user-7','user-8')
figure(2)
semilogy(a2,zt)
xlabel('SNR(dB)')
ylabel('Bit Error Probability, P_{e,k}')
title('Error Probability for user-k')
grid
legend('user-1','user-2','user-3','user-4','user-5','user-6','user-7','user-8')
They are almost similar with picture in problem(2a). But they are different. I think this difference comes from different coding system.
As we can see in left picture- between BPSKs, difference due to coding operating, BER is changed due to many cause.
In a communication system, the receiver side BER may be affected by transmission channel noise, interference, distortion, bit synchronization problems, attenuation, wireless multipath fading, etc.
The BER may be improved by choosing a strong signal strength (unless this causes cross-talk and more bit errors), by choosing a slow and robust modulation scheme or line coding scheme, and by applying channel coding schemes such as redundant forward error correction codes.
end
zt=[zt I];
end
a2=[0:0.01:14]; %x axis - DB scale
plot(a2,zt)
xlabel('SNR(dB)')
ylabel('P_e')
ylabel('Bit Error Probability, P_{e,k}')
grid
legend('user-1','user-2','user3','user-4','user-5','user-6','user-7','user-8')
figure(2)
semilogy(a2,zt)
xlabel('SNR(dB)')
ylabel('Bit Error Probability, P_{e,k}')
title('Error Probability for user-k')
grid
legend('user-1','user-2','user-3','user-4','user-5','user-6','user-7','user-8')
They are almost similar with picture in problem(2a). But they are different. I think this difference comes from different coding system.
As we can see in left picture- between BPSKs, difference due to coding operating, BER is changed due to many cause.
In a communication system, the receiver side BER may be affected by transmission channel noise, interference, distortion, bit synchronization problems, attenuation, wireless multipath fading, etc.
The BER may be improved by choosing a strong signal strength (unless this causes cross-talk and more bit errors), by choosing a slow and robust modulation scheme or line coding scheme, and by applying channel coding schemes such as redundant forward error correction codes.
키워드
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