Subject: Wireless Communications

1. The perpendicular insertion of a thin, infinitely conducting ground plane between the two halves of a half-wave dipole antenna has no effect on the fields created by that antenna for a given set of driving conditions.

True or False

2. Spread Spectrum communications use a transmission bandwidth many times smaller than the information bandwidth or data rate of any user.

True or False

3. The receiver uses cross-correlation to separate the appropriate signal from signals meant for other receivers, and auto-correlation to reject multi-path interference.

True or False

4. In a TDMA system, a user does not have exclusive use of a frequency during a time slot.

True or False

5. Because of limited frequency bands, a mobile radio network has only a relatively small number of channels available and therefore, frequencies are spatially reused in a geographic area.

True or False

6. 802.11a and g devices require an FCC license to be legally operated in the US.

True or False

7. Orthogonal Frequency Division Multiplexing (OFDM) is a modulation technique, not a multiple access strategy

True or False

8. OFDM requires very accurate frequency synchronization between the receiver and the transmitter.

True or False

9. A Rayleigh probability density function (pdf) does not include a direct path signal.

True or False

10. A Ricean probability density function (pdf) is a Rayleigh pdf with a direct wave signal.

True or False

11. Fixed broadband wireless is a type of satellite communications.

True or False