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.
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