Big problem with 2.4GHz band Interference

[abcyin]

Hi, all,

I'd like to design a receiver which operates close to the 2.4GHz band, really close to, like 3MHz distance from there, so how can I deal with the interference there?

And another question is that, how large it could be of the 2.4GHz interference? if it goes through the signal path of the receiver, probably it will affect the linearity of the IF blocks, such as the linearity-limited filter.

thx in advance

 

[dick_freebird]

It depends on what you're trying to receive. If you want CW
or AM, you can forget it being clean. If it's a digital radio
waveform you might need coding gain and redundancy to
get reliable link performance.

Problem is you want to design into a pretty filthy and variable
band, and the way people manage it is by great complexity
built by teams (armies) of engineers. That's the downside of
the unlicensed bands - you get to swim in a sewer.

 

[abcyin]

Could these huge interference be solved in the digital part? such as, if the 1st time reception was failed by the interference, could the baseband tells to redo the reception?

 

[dick_freebird]

You can overcome degrees of interference with word and
packet level error correction,or feedback & retry, but at
some level of interference even these are too compromised.
Error correction with a fixed number of EC bits appended,
can only correct some lesser number of bad bits. Like, I think
you need 2 EC bits to fix one, flag two. You could send each
packet three times and construct one based on bitwise voting.
But all of this still needs data to win over noise, often enough.
All of this is pretty thought through in Bluetooth and other data
radios, and a "works for most" compromise built. But you still
hear of interoperability problems, when things get close or
crowded.

Whether a ~ 1% frequency offset relieves the splatter problem
I don't have a good idea.