Related to BER Vs SNR plot

Hello all, I have written the MATLAB code for BER (Bit Error Rate) Vs (Signal to Noise Ratio) plot. My problem is that every time I run the program, it shows some variation in the values of BER, while I am expecting same values of BER every time we run the program.

The code consists of sentences that involves random numbers and hence I had generated random numbers by running a for loop 80 thousand times. Still there is some variation in BER values.

I am not getting where I am doing wrong.

Any help in this regard will be highly appreciated.

Answer 1

[KALYAN ACHARJYA]

As you've mentioned that the code involves the generation of random or sample data (rand function), each time the code is executed, it generates different random data it could yield varying BER data. Consider using fixed data for the random data generation variable to stabilize the Bit Error Rate (BER) values.

[chaaru datta]

Thank u sir for ur response. I am working on wireless communication project and in wireless, the channel between transmitter and receiver is always going to be random variables and so while plotting BER Vs SNR curves, we cannot omit the random nature of channels.

Thus to minimize the variations, I had generated random numbers by running a for loop 80 thousand times.