cmosbjt
Full Member level 5
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eb/n0
In order to measure the BER of my BPSK demodulator, I need to know what is the Eb/No of my input BPSK signal.
I use a function generator to generate the BPSK signal, which has a square waveform. Then I add white noise on top of the BPSK signal. By changing the white noise level, I can change the Carrier to Noise (C/N) ratio.
There is no band pass filter in front of the demodulator.
By definition:
Eb/No = C/N * Bw/fb (Bw is the bandwidth, fb is the bit rate)
Here are my questions:
1. The sqaure wave has a fundamental tone and many harmonics. How to determine the C/N? (using a spectrum analyzer (specifying the bandwidth) ? or a power meter (broad band) ? )
2. The BPSK signal I generate is a square wave, it has theoratically an infinate bandwidth as an ideal square wave has infinate harmonic components. So what is the bandwidth (Bw) in this case?
In order to measure the BER of my BPSK demodulator, I need to know what is the Eb/No of my input BPSK signal.
I use a function generator to generate the BPSK signal, which has a square waveform. Then I add white noise on top of the BPSK signal. By changing the white noise level, I can change the Carrier to Noise (C/N) ratio.
There is no band pass filter in front of the demodulator.
By definition:
Eb/No = C/N * Bw/fb (Bw is the bandwidth, fb is the bit rate)
Here are my questions:
1. The sqaure wave has a fundamental tone and many harmonics. How to determine the C/N? (using a spectrum analyzer (specifying the bandwidth) ? or a power meter (broad band) ? )
2. The BPSK signal I generate is a square wave, it has theoratically an infinate bandwidth as an ideal square wave has infinate harmonic components. So what is the bandwidth (Bw) in this case?