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Reply To: TRX TS …


Hi Amit,

That is a very tough question.

I think it has to do with the data rate you can get with GMSK, which is the modulation used in GSM.

With a bandwidth of 200kz and GMSK modulation, you can get a gross bitrate of 270kb/s. Into how many “slots” can you divide this so that you can still have effective communication? Well, according to the people who designed GSM,the optimum is 8.

270/8 gives 33.75kb/s, and considering that a full rate speech coder requires 13kb/s, you have more than enough overhead to add protection/coding bits.

Hope you’re convinced.

PS: I’m not convinced myself. 😀