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does "gardner timing phase recovery" need a "frequency offset cancelation" before??

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hamebaman

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does "gardner timing phase recovery" need a "frequency offset cancelation" before??

i'm designing a baseband processor for zigbee/ieee 802.15.4.but i don't know that if i use gardner method for timing recovery anymore i need a frequency offset cancellation part in my baseband processor???while zigbee must tolerate +/- 45 ppm frequency offset.
and in practical noncoherent receiver circuits which timing recovery is used???a simple correllation with preamble or other complex algorithm like gardner or mueller-muller and so on.
thank you.
 

Re: does "gardner timing phase recovery" need a "frequency offset cancelation" befor

If you use timing recovery schme, you should notice how big frequency offset it can correct. if the the frequency offset is very big than your timing recovery capability, you should consider some sort of frequency offset cancellation before it
 
Re: does "gardner timing phase recovery" need a "frequency offset cancelation" befor

thank you for your notice and answer.
do you know how much frequency offset every timing recovery scheme can tolerate??and can you introduce me a survey of them??
i'm working on baseband processor for zigbee,can you tell me i can use just a simple correlation algorithm to time synchronization or i should use another timing recovery algorithm???i read that simple correlation can't be use for timing synchronization and it is used only for finding time phase difference,and a timing recoery sheme is needed to time synchronization ,is it true???
 

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