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How to understand Coherent and noncoherent detection?

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Hi,
Please kindly help me~~:cry::cry::cry::cry::-:)-:)-(

Coherent and Noncoherent detection for MFSK, which needs larger bandwidth???
Why?

Assume 4-FSK and binary FSK have same bandwidth, using noncoherent detection,
do they have same bit rate??

I mean:
According to R/bandwidth=2log2(symbol number)/(symbol number) for orthogonal signals using coherent detection,

then, for 4-FSK and binary FSK
R(FSK)=log2(4)/4 *bandwidth
R(binary FSK)=log2(2)/2 *bandwidth


However, i do not think they have same bit rate. Do i make any mistakes? Where is it???

Please help me. Please~~~

Thank you~~:):):):):):)
 

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