Bug 2465 – Microwave oven model has overlapping subbands

Bug 2465 - Microwave oven model has overlapping subbands


Summary:	Microwave oven model has overlapping subbands

Status:	NEW

Product:	ns-3
Classification:	Unclassified
Component:	spectrum
Version:	ns-3-dev
Hardware:	All All

Importance:	P5 normal
Assigned To:	Nicola Baldo

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2016-08-06 20:25 EDT by Alexander Krotov
Modified:	2016-08-06 20:35 EDT (History)
CC List:	1 user (show)

See Also:

Attachments
Test scenario (2.47 KB, text/x-c++src) 2016-08-06 20:25 EDT, Alexander Krotov	Details
Gnuplot script to plot test scenario results (248 bytes, text/plain) 2016-08-06 20:27 EDT, Alexander Krotov	Details
Result plot before patch (6.61 KB, image/png) 2016-08-06 20:28 EDT, Alexander Krotov	Details
Result plot after patch (6.56 KB, image/png) 2016-08-06 20:29 EDT, Alexander Krotov	Details
Proposed patch (1.09 KB, patch) 2016-08-06 20:31 EDT, Alexander Krotov	Details \| Diff
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Description Alexander Krotov 2016-08-06 20:25:33 EDT

Created attachment 2519 [details]
Test scenario

MicrowaveOvenSpectrumModel5MhzInitializer and MicrowaveOvenSpectrumModel6MhzInitializer create subbands with distance of 5Mhz and 6MHz respectively. The problem is that they are 10Mhz and 12Mhz wide, while they should be 5Mhz and 6Mhz wide so they don't overlap.

This results in 3dB (2 times) difference: each subband contributes its PSD twice.

Attached is a scenario (simplified spectrum example with ALOHA etc. removed) that places microwave oven and spectrum analyzer in the same point in space. Plots and patch follow.

Comment 1 Alexander Krotov 2016-08-06 20:27:57 EDT

Created attachment 2520 [details]
Gnuplot script to plot test scenario results

Script plots PSD in dBm so it can be compared to PSD in the article "Microwave oven signal modeling" referenced in source code.

Comment 2 Alexander Krotov 2016-08-06 20:28:45 EDT

Created attachment 2521 [details]
Result plot before patch

Comment 3 Alexander Krotov 2016-08-06 20:29:37 EDT

Created attachment 2522 [details]
Result plot after patch

Comment 4 Alexander Krotov 2016-08-06 20:31:26 EDT

Created attachment 2523 [details]
Proposed patch

Comment 5 Alexander Krotov 2016-08-06 20:35:12 EDT

Note that plot has narrower range than plot in the article, but you can compare the value on the center frequency (2.42 Ghz in Fig. 3) or change the model of spectrum analyzer to cover the whole range of frequencies.