Implement SNR based simulation

Assuming that the input RMS power is known and equals to 1 (signal voltage range of [-1,1]), the effects of path loss can be simulated by adjusting properly the SNR based on the given TX power, TX/RX antenna gains, etc. This will simplify a lot the simulations and the use of gr-leo.

To do this, the samples per symbol and the bits per symbol should be known.

Edited by Manolis Surligas
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