Problem in FSK modem code

[Somia]

fsk modem

Hi

I got this matlab code which is for FSK modulation and demodulation. It works fine for the default values of
Carrier_Freq = 1750
Freq_Deviation = 100
Sampling_Freq = 9600
Symbol_Rate = 300

But when I change these values it gives error while demodulating.
My required values are:

Carrier_Freq = 1700
Freq_Deviation = 400
Sampling_Freq = 8000
Symbol_Rate = 1200

These are actually the values of V.23

Can anyone please take a look at this code and tell me where the problem is. I am totally new to matlab and I am trying to learn it by myself, that's why I can't figure out much myself.

the zip file contains 7 matlab files. FSK_System.m is the top level system wrapper file. User can change parameters of both Modulator and Demodulator from FSK_Mod_init.m and FSK_Dmod_init.m files respectively.

Thanks in advance
Somia

 

[mahdithdn]

fsk modem matlab

Hi Somia,
I tested your signal, it had a small bug.
sampling frequency to symbol rate ratio must be integer. e.g. if you want to keep sampling frequency in 8000 you can specify 8000/6 = 1333 or 8000/5 = 1600 to symbol rate.
Hope these helps.
Regards.

 

[MudassirMehboob]

matlab fsk modem

Hi i downloaded your code. it includes sevem .m files but only 5 are being used what the other two(timiing recovery &timing recovery2) are supposed to do. i wonder if you could help me in my project i want to decode fsk modulated caller id.
When i demodulate the signal i must see the numbers.
Thanks