Error generating a psk modulation

Hi,

I am trying this code

%%

% Set the random number generator to a known state to be able to regenerate

% the same frames every time the simulation is run

rng(123456)

% Random bits

d = randi([0 1],1024,1);

% BPSK modulation

syms = pskmod(d,2);

% Square-root raised cosine filter

filterCoeffs = rcosdesign(0.35,4,8);

tx = filter(filterCoeffs,1,upsample(syms,8));

% Channel

channel = helperModClassTestChannel(...

'SampleRate',1e8, ...

'SNR',20, ...

'PathDelays',[0 1.8 3.4] / 200e3, ...

'AveragePathGains',[0 -2 -10], ...

'KFactor',4, ...

'MaximumDopplerShift',4, ...

'MaximumClockOffset',5, ...

'CenterFrequency',900e6);

rx = channel(tx);

and getting the very last entry of the rx vector as Nan+NaNi

What is the reason? How to fix this problem?

Thanks for your help in advance.

[KALYAN ACHARJYA]

@Rachana Matlab version, you are using?

Hello Memeber, it may be helpful to check, the question belongs from here

[Rachana Aravind]

version 2019a

Answer 1

[Samatha Aleti]

In the class HelperModClassTestChannel the timing drift is calculated based on the clock offset for the current frame and specified sampling rate. The output of sampling time drift is the values of input at the modified sampling rate. This tried to interpolate data out of input range, leading to a NAN value.

Hope this helps!