I am trying to analyze the functionality of each of the blocks in the
mod/demod when I noticed the following behavior.
The high level modulator flow control is as | Symbols |-> | RRC filter
-> |amplifier | -> channel
and that for the demodulator is channel -> | Pre-scaler|
|agc| -> |RRC | -> |clock recovery| -> |slicer|
My understanding is that the real part of the output of the clock
must be close to that of the symbols or some scaled version of it(+a, -a
case of bpsk).
However, my observations (in the link below) show that the output of the
clock recovery depends a lot on the bit pattern, i.e., for the bit
1010 the peaks of the 1s and the 0s are way smaller than those of the
Since we are using a RRC I would doubt it is due to ISI . and since the
radios are close to each other and there is a direct LOS I donot think
is due to multi-path (or is it?). Is this behavior due to some
RFX 2400/USRP or something else?
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