Ok, Im aware about the damage as a result of direct connection,
But now the question is How to recovery the m(t) signal in spite of
noise?
That is, finally the I and Q in rx should be equal to I and Q in tx.
On 08 Jan 2013 13:49, José María Valencia wrote:
Ok, I’m aware
about the damage as a result of direct connection,But now the
question is How to recovery the m(t) signal in spite of noise? That is,
finally the I and Q in rx should be equal to I and Q in tx.
The values
of I/Q at the receiver will, hopefully, be linearly-proportional to the
values as transmitted. When you use radio systems to convey
information, you use those signals to encode that information, using
modulation schemes that only require that the signals be
linearly-proportional (and sometimes not even that) to the signals as
sent. That’s how radio works. You modulate information onto a carrier,
and demodulate that carrier to recover the original (or a reasonable
facsimile of the original) information.
The Universe conspires to
mangle electromagnetic waves, to a greater or lesser extent, depending
on a number of factors including wavelength, distance, interference,
etc, etc, etc. If you rely on the received signal to be identical to
the transmitted signal, then you are living in a conceptual state of
sin, and must revise your thinking.