Re: [Openbts-discuss] Modulation Phase Accuracy

[David B. <da...@ra...>]

Our experience is that when the base clock phase noise is improved, the guard period envelope will also improve.

On Jul 14, 2012, at 1:04 AM, Sylvain Munaut wrote:

> Hi,
> 
>> Probably a stupid question, but could we just add one more guard bit
>> to the beginning instead of "stealing" bits from the end?
> 
> Not really ... the code will call modulateBurst either with 0 guard
> bits for generating various reference waveforms. Or with 8/9 guard
> bits depending on the timeslot to respect the GSM specs of 8.25 guard
> bits between burst, you can't just add new guard bits without
> violating the GSM timing which would be much worse than violating the
> rise time during the tail bits.
> 
> Doing it the way I do the correct GSM framing is respected but TX/RX
> are shifted a bit which is not ideal and would need to be compensated
> for somewhere.
> 
> Cheers,
> 
>    Sylvain
> 
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David A. Burgess, CEO
Range Networks, Inc.
San Francisco
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