Re: [Discuss-gnuradio] Poly phase channelizing in Blade Or USRP

[Martin Braun]

On 09/26/2016 04:31 PM, Ed Criscuolo wrote:
> What about an RFNoC solution?

That's what Sylvian was alluding to :)

M
> 
> @(^.^)@ Ed
> Sent from my iPhone
> 
>> On Sep 26, 2016, at 7:16 PM, Sylvain Munaut <address@hidden> wrote:
>>
>> Hi,
>>
>>
>>> It seems like a perfect fit for a poly phase filter - however this is
>>> something that I believe needs to be done in hardware (128 channels *
>>> 200khz = about 60mhz sample rate this will not go over a USB cable, and
>>> I doubt I can get this bandwidth into a laptop PC.
>>
>> !?!?
>>
>> 128 channels of 200 kHz = 25.6 MHz of bandwidth. You can totally get
>> that to a laptop.
>> B2xx or BladeRF will do that without issues given a sufficiently good laptop.
>> Even a hackRF with USB2 only can nearly do it ( 20 MHz ).
>>
>> If the transmission are "infrequent" you can even use the same trick
>> that researchers used a while back to listen to all of bluetooth and
>> deliberately alias the signal to fold the spectrum over itself.
>>
>>
>>>    Am I going to have to do FPGA work on my own?
>>
>> Very likely.
>>
>>
>>>    Or - is there some existing cook book solution with the FPGA
>>> configuration pre-cooked?
>>
>> Very unlikely to find something "all done".
>> Especially that if you don't want to ship the samples, a PFB is not
>> all you need. You'd need demod for each channel in the hardware as
>> well.
>>
>>
>>> What I am looking for is the FPGA channelizer solution... hopefully an
>>> existing one I could start with?
>>
>> There is an embryon of one in the ettus rfnoc repo and AFAIK they
>> might also replace it with another version soon.
>>
>> But it's written for RFNoC and Series-7 Xilinx fpga. It'll need quite
>> some adaptation to run on anything else.
>> Also, AFAIU, it's incomplete and non-tested currently so ... YMMV.
>>
>>
>> Cheers,
>>
>>    Sylvain
>>
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