[Discuss-gnuradio] Fractional Delay

[mohammad nejati]

Hi ,

I want subtract a transmitted signal with it's received delayed
version , the problem is in receive side i sample signal in a
uncertain sample time and off course when i subtract that with
original signal (after AGC) , it doesn't work at all .
Since delay block work only in integer value (one sample) it was not
possible i use that for phase aligning two signal , What i did was i
interpolate signal pass it through delay block and decimate it again ,
in this scenario with a interpolation factor of 100 i can get a good
phase alignment and subtraction of signals.
But the problem is that interpolation and decimation are very
inefficient , i can barely get 300Ksps when i use an interpolation
factor of 100 , i need at least 10Msps  .
What is your suggestion ?

Thank you .

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