Upsampling to 2Ghz with 4.7GHz sampling rate gives an error of memory is full.

[Syed Bilal]

When i upsample my 48khz(time doamin) signal to a 2Ghz frequency(using 4.7GHZ Sampling rate) labview 8.5 gives me an error of memory is full. It goes as far as 2MHz for Upsampling and after that there is the memory error. My 48 KHZ signal is 1 sec in duration and i evn tried using half the samples that is for 0.5 seconds but it does not goes up to 2GHz. How can i resolve this issue ?

[RavensFan]

Use a much, much smaller portion of your signal.

One second of a 2 GHz signal is 2 billion samples.  If there was only 1 byte per sample, that would require 2 GB.  Since each sample probably requires more than that (a double representation needs 8 bytes), you could be up to needing 16 GB of memory.  Far more than your PC would have.

A jump from 48 KHz to 2 Ghz is pretty large, 41,667 times.  Are you sure you are going to get any reasonable data after upsampling?

[Ben]

Use the sytem task manager to monitor how much memory you are using. Windows by default limits you to 2G total (OS plus app plus data). There is a "switch" that will make Winodws "3 Gig aware" if you have more physical memory.

The other limitaion is that LV works with contiguous buffers. If it can not find a single block of memory large enough, you get that error.

THe only work-arounds are "divide and conquer" types like work with smaller chuncks of data etc.

Just trying to help,

Ben

[Syed Bilal]

Hey thanx both,

                          Regarding getting reasonable data at that frequency what i am doing is checking the performance of a mixer at Microwave frequencies once i get the data to 2Ghz than ill down convert the data to baseband from that frequency using a mixer and where ill take some readins. Howevever write now i am not even being able to upconvert the signal from basband to 2GHz. Therefore i wanted to get help in that respect. Thankyou

[Syed Bilal]

so if anyone of you or anyone else can help me in this regard id be highly grateful. 

[RavensFan]

As Ben said, you will need to work on smaller chunks of data at a time.

What do you want to do with the data once you have it?  Save it to a file?  Where is the data coming from?

Try working with only 1000 samples of the original waveform at a time and upsampling that.  Save to a file.  Go back and use the next 1000 samples.  Repeat until you've reached the end.

[GovBob]

I am assuming this microwave mixer is a physicle device that you are testing? What type of hardware are you using to generate this 2GHz RF signal?

[RER]

here is a helpful set of hints and tips for when LabVIEW is consistantly running out of memory. It backs up much of what has already been written on this thread.

Why do I get "Memory is Full" Error in LabVIEW?

Thanks guys,