itpp::AWGN_Channel Class Reference
[Channel Modeling]

Ordinary AWGN Channel for cvec or vec inputs and outputs. More...

#include <channel.h>

List of all members.

Public Member Functions
	AWGN_Channel (double noisevar=0.0)
	Class constructor. Sets the noise variance (for complex-valued channels the sum of real and imaginary parts).
void	set_noise (double noisevar)
	Set noise variance (for complex-valued channels the sum of real and imaginary parts).
double	get_noise () const
	Get noise variance (for complex-valued channels the sum of real and imaginary parts).
cvec	operator() (const cvec &input)
	Feed the complex input input through the complex-valued AWGN channel.
vec	operator() (const vec &input)
	Feed the input through the real-valued AWGN channel.

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Detailed Description

Ordinary AWGN Channel for cvec or vec inputs and outputs.

For real signals, the input parameter (noisevar) denotes the noise variance per real dimension. Therefore, it should be set to , where is the noise power spectral density. However, in case of complex signals, the input parameter (noisevar) represents the noise variance per complex dimension, i.e. the sum of the variances in the real and imaginary parts, and thus is equal to .

Example:

  #include <itpp/itcomm.h>
  using namespace itpp;

  int main() {
 Initiate the AWGN_Channel class
    double noisevar = 0.1;
    AWGN_Channel awgn_channel(noisevar);

 Initiate a QPSK-modulator, and generate the transmitted signal
    QPSK qpsk;
    bvec transmitted_bits = randb(20);
    cvec transmitted_signal = qpsk.modulate_bits(transmitted_bits);

 Usage of the member operator ()
    cvec received_signal = awgn_channel(transmitted_signal);

 Demodulate the bits
    bvec received_bits = qpsk.demodulate_bits(received_signal);
  }

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The documentation for this class was generated from the following files:

• channel.h
• channel.cpp