There are two ways of detecting an MSK signal. One way is to use a coherent receiver to take full account of the phase information content of the MSK signal. Another way is to use a non-coherent receiver and disregard the phase information. The second method offers the advantage of simplicity of implementation, at the expense of a degraded noise p formance. By how many decibels do we have to increase the bit energy-to-noise density ratio Eb/N0 in the second case so as to realize an average probability of symbol error equal to 10–5 in both cases?