Cognitive Radio Project

This is probably the last big thing I will do for the project this year. The articles are hard to read, and the maths behind the whole cyclostationary thing is daunghting at best… Anyway, I have managed to chew through some of that, and a proof of concept MATLAB simulation has been done.. There won’t be enough time to do this properly on the LabVIEW and my VSA box.. but oh well, the next person could probably carry on…

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Ok so I forgot to actually include the VIs in the post back in June (http://cr.jamesyxu.com/?p=122), some people have been asking for it, so I will post the images here…. all files are expected to be open via SVN later though, so dont worry…

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Right, so one thing we did find over the past few weeks when doing channel sensing, is that if your window is out of place (so that only a leg of the signal is in the detection window), or too big (compared to the signal you are measuring), you are not going to get much from that detector.

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This post is a continuation from the last one (Preliminary wideband channel sensor part 1). Here I am just going to detail a small section of the labView subVI, namely the Thresholding part. Working from part 1, I have consolidated the threshold calculation into a single subVI (Usage in part 2):

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Started on a preliminary sensor in LabVIEW last week, I’m going to just summarize the basic ideas behind this part, and then put some screenshots here. Details will be in the report at the end of the project if anyone is interested

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Ok… continuing on from the other post.

Noise uncertainty – IEEE 802.22 06/0134r0, Qualcomm

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I printed out a whole load of artiles from IEEE, reading them is slow, but so far I have found some very very good articles.. I will summarize them abit below. Keep in mind this summary is probably only really helpful to me and people who are very familiar with the subject (My logics are weird at times). So if you find something interesting please go read the original article.

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Just made a FM radio receiver (code will be avaliable on SVN shortly) in LabView. The whole point is not to listen to the radio.. the idea was just to warm up to LabVIEW hehe, as I have said before I havent touched LabVIEW for almost a year, needed some warm up..

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hmm, that guide wasnt nearly as long as I thought it would be…. Most of the guide was going through the various LabVIEW components, what they do, what each parameter is etc. There are a few things of interest, and I thought I’d just leave them here

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There are a few things that I’ve noticed while setting up the workspace for the PXI:

• There arent really enough USB ports on the PXI, sure there are 4, but if you think about it, you need Keyboard + Mouse, which is either 1 USB or 2, depending on what splitter you are using. But either way, you are going to need 1 more for a External DVD  Drive, and that leaves only 1 remaining
• Lack optical drive, sure I can run setups through the network, but the box didnt come with the RF Spectral Measurement toolkit installed, and guess what, its on a DVD >.<
• No LNA, if you ever start to wonder why the signal is on -100dB when you have the transmiter right next to the antenna lol, check the Downconverter’s block diagram, its a 3 stage superhet receiver, minus the preamp
• KVM is very useful! We have a shinny computer as well as the PXI, and as the other post (FM one)’s gallery shows, we are running a dual screen setup, normally both screens can be used on the main computer, with the 2nd screen connected to a KVM which goes into the PXI, flip a switch you can start using the PXI!
• Remote desktop works, barely. If you are sitting right next to the machine, with 2 screens, and you are using RDC, the pain really hits you when you see highlighing an interactive help in labview takes like 10 seconds -.-… Having said that though, its awesome to be able to RDC into the PXI from half way across the campus, this allows for remote sensing as well
• The machine is sadly very loud, obviously not designed to be kept next to your table, rather than the humming you get this massive *VRUM* sound, kind of awesome in a way

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