Analysis of results of signal strength in the transmission path

Analysis of results of signal strength in the transmission path

To compare attenuation in various roofing materials, data analysis was conducted using MS Excel data analysis tool kit. The test statistics applied were t-test and ANOVA single factor testing at 5% level of significance. The results from the test statistics were captured and presented as in appendix A. Whereas iron and clay exhibited different signal attenuation means, the test statistics showed that there was no significant difference between them. The two roofing materials showed the lowest attenuation effects. Aluminum and plastic exhibited medium signal attenuation means and the test statistics showed that they are significantly similar. Decra and steel roofing materials on the other hand exhibited the highest attenuation effects to the propagated signal.  They are significantly similar yet different from the rest of the roofing materials.

	Propagated Received Signal Strength RSS (dBmV/M)
Materials		Mean	Max (90)	Min (135)
Decra		57.0	72.92	29.04
Steel		63.0	64.96	63.40
Aluminum		69.7	79.77	46.83
Plastic		72.0	78.02	73.35
Clay		75.5	88.48	63.24
Iron		76.4	89.04	68.48

 
The highest and lowest mean attenuation occurred at angles of incidence of 90 and 135 degrees respectively. The interactive tests showed that the lowest received signal strength (29dBmV/M) occurred on decra material at an angle of 135 degrees while the highest (89dBmV/M) occurred on iron at 90 degrees. See appendix A for statistical analysis. The attenuation ratio decreased as the angle of incidence was varied from 0 degrees to 90 degrees.