MODULATION AND CHANNEL SIMULATION

The software currently only supports BPSK modulation and  an AWGN channel.
The function BPSK(codeword,amplitude) and AWGN(tx_waveform,No) perform the modulation and channel simulation
respectively.
The function parameters are explained below,
codeword:The array containing the bit sequence that needs to be transmitted.
amplitude:The amplitude of the BPSK waveform (amp representing the voltage for 1and -amp representing the voltage for 0)
tx_waveform: The output of the BPSK( ) function
and No/2 is the noise variance.

Function Usage Example:
  % assume the codeword c and No are already loaded into the MATLAB memory
  tx_waveform=bpsk(c,1);  %amp= 1
  rx_waveform=awgn(tx_waveform,No);


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