How to increase sampling rate without change of the signal bandwidth

Hello Everyone,

Could you please help to advise on how can I increase the sampling rate without without modifying signal bandwidth.

In my case. I having 600 Hz signal with 1.2k sampling rate (As attached screenshot).

For what parameters/block I set are following.

• Bernoulli Binary Generator

Sample time = 1/600

Sample per frame = 200

• Modulation : DBPSK
• Raised Cosine Tx filter

Filter span in symbol =10

Output sample per symbol = 2

What I want is to have the same 600 Hz wide signal with sample rate to be ~ 1MHz.

Is it possible to do that?

Best Regards,

Fumihiko Sato

Answer 1

[Sai Kiran]

Hi,

As per my understanding you want to increase the sampling rate of a signal.

You can use 'FIR Interpolators' to upsample your signal to a desired sampling rate.

By setting the Interpolation factor, your signal gets upsampled to InterpolationFactor*Existing_SampleRate.

Please refer to the following documentation for more information on 'FIR Interpolators'.

https://in.mathworks.com/help/dsp/ref/firinterpolation.html

I hope it helps!

Thanks.

Answer 2

[Walter Roberson]

resample and then put it through a low pass filter at 600 Hz . The source rate is 600 Hz so logically the low-pass should leave everything the same, but in practice it should trim off some transients caused by the resample()