What term is used to describe the time differential between a primary signal and a reflected signal arriving at a receiver?

	A.	Delay spread
	B.	Multipath
	C.	Path delay
	D.	Spread spectrum

18. Explain briefly the principle of operation of the Spread Spectrum. What is FHSS and DSSS? Discuss briefly each one of them.

19. What isthe difference between Visual Line of Sight and RF Line of Sight?Discuss briefly explaining the Fresnel zone

20. Itis importantto havethe_____________ofthe transmitting and receiving antennas oriented the same in order to receive the strongest possible signal.

21. Which one has typically larger value, IR or EIRP?Explain why and explain what each represents.(2marks)

22.

802.11a OFDM radios are backward compatible with which IEEE 802.11 radios?

	A.	802.11 legacy (DSSS) radios
	B.	802.11g (ERP) radios
	C.	None of the given options
	D.	802.11n (HT) radios
	E.	802.11 legacy ( FHSS) radios
	F.	802.11b (HR-DSSS) radios

23. In wireless communication networks, throughput is less than the data rate? In point form, provide five reasons/factors for that,and explain each one shortly.