02-04-2009 03:03 PM
Hi there,
The aim is to perform cross correlation in the time domain pt by pt. This entails 2 arrays of data which 'slide' across each other getting multiplied and added.
I can do this easy enough but my problem is that during the next time instance I want to add a pt to each of the arrays and delete the first point in the array then perform the cross correlation again. I have found that the majority of the multiplications in the first time instance are the same as in the second instance. I want to utilise this fact.
I have been told to try playing round with stacked shift registers but am stuck..... I hope this picture kind of explains what I want to do as I'm battling with words at the moment.
If anyone could help me I would be much appreciated!!!
02-05-2009 06:07 AM
02-08-2009 02:31 PM
02-08-2009 02:47 PM
02-09-2009 10:39 AM - edited 02-09-2009 10:40 AM
If you are running out of FPGA space, be sure that you do not have any array indicators or controls on the front panel, this could use up a lot of space.
Have you seen our ipnet page? It is a collection of user and employee submitted FPGA calls, and a quick look at it shows there is a cross-correlation and an auto-correlation. Looking at these may help you architect your code better (www.ni.com/ipnet)