Hi,

> On 9. Nov 2017, at 17:25, Sumit Kumar <sumit.ku...@alumni.iiit.ac.in> wrote:
> 
> Hi, 
> 
> The 802.15.4 spec says that the channels should be 2 MHz wide with 5 MHz 
> inter channel spacing. 
> 
> Why does gr-ieee 802.15.4 uses a sampling rate of 4MHz instead of 2 MHz ? 
> 
> Off course it works with commercial devices, but I am curious why 4 MHz and 
> not 2 MHz. 

With 4Mhz, the receiver samples the signal at a rate of 2 samples per chip. You 
could also use less or more, it’s a trade-off between computational complexity 
and performance.

Best,
Bastian
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