BEP

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   Computes the bit error probability given C/N and the bit rate.
   Five types of modulation, 'BPSK' 'QPSK' 'DE-BPSK' 'DE-QPSK' 'D-BPSK'
   are available.
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   Form:
   bEP = BEP( type, bitRate, cOverN )
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   ------
   Inputs
   ------
   type		    (1,:)   Modulations: 'BPSK' 'QPSK' 'DE-BPSK' 'DE-QPSK'
                           'D-BPSK'
   bitRate         (1,1)   Bit rate (bps)
   cOverN          (1,:)   (C/N)T (dB)
   
                        
   -------
   Outputs
   -------
   bEP             (1,:)   Bit error probability
   eOverN          (1,:)   Energy per bit (dB)
                         
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   References:	Maral, G. and M. Bousquet, "Satellite Communications Systems
               Third Edition", Wiley, 1993, p. 125.
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