Decide if the following statements are True [ √ ] or False [ ]. Correct the false ones if any:  A log-distance shadowing model is useful when dealing with a more realistic situation [ √ ] …………………………………………………………………………………………………………..  IEEE 802.16d model is based on the log-normal shadowing path loss model [ √ ] …………………………………………………………………………………………………………..  The speed of surrounding objects around a mobile generates path loss of the wireless signal [ ] The speed of surrounding objects around a mobile generates Doppler shift, not path loss. …………………………………………………………………………………………………………..  The slow fading generates in the received wireless signal due to the multipath delay spread [ ] Slow fading is caused by shadowing effects, not multipath delay spread. …………………………………………………………………………………………………………..  The precoding matrix indicator (PMI) at the Rx feedbacks the amplitude variations to the Tx [ ] The PMI at the Rx feedbacks the preferred precoding matrix, not amplitude variations. …………………………………………………………………………………………………………..  Beamforming increases the signal strength at the Rx in proportion to the number of Tx antennas [ √ ] …………………………………………………………………………………………………………..

Choose the best answer for the following multiple-choice:  Rapid variation of the received signal level due to the effect of multiple signal paths is known as: a. Path loss b. Time variance c. Flat fading d. Shadowing  For the log-distance path loss model, the reference distance (do) is properly defined based on: a. Signal frequencies b. Antenna Gains c. Propagation environments d. Signal bandwidths  Multipath delay spread in the wireless channels causes: a. Doppler spread b. Time dispersion c. Frequency dispersion d. Fast fading  A probability density function of the signal received in the LOS environment follows: a. Rician distribution b. Gausian distribution c. Rayleigh distribution d. Normal distribution  In the MIMO wireless system, increasing of the QAM modulation levels leads to: a. Data rate ↑, Error rate ↓ b. Data rate ↑, Error rate ↑ c. Data rate ↓, Error rate ↓ d. Data rate ↓, Error rate ↑  In multiple- antenna systems, the data rates mainly increased by: a. Spatial diversity techniques b. Beamforming techniques c. Modulation techniques d. Spatial multiplexing technique

Question 26 :In an IEEE 802.11g/n WLAN, coverage can be affected by ____________ and ____________. Each correct answer represents a complete solution. Choose two. This type of question contains radio buttons and checkboxes for selection of options. Use Tab for navigation and Enter or space to select the option.Aoption ARF range in useBoption Bsecurity protocols in useCoption Cchoice of software applicationsDoption Dpropagation aspect of obstaclesEoption Eextent of RF reflections

In an IEEE 802.11g/n WLAN, coverage can be affected by ____________ and ____________. Each correct answer represents a complete solution. Choose two. This type of question contains radio buttons and checkboxes for selection of options. Use Tab for navigation and Enter or space to select the option.Aoption Aextent of RF reflectionsBoption Bpropagation aspect of obstaclesCoption Cchoice of software applicationsDoption Dsecurity protocols in useEoption ERF range in use

In an IEEE 802.11g/n WLAN, coverage can be affected by ____________ and ____________. Each correct answer represents a complete solution. Choose two. This type of question contains radio buttons and checkboxes for selection of options. Use Tab for navigation and Enter or space to select the option.Aoption Apropagation aspect of obstaclesBoption Bchoice of software applicationsCoption Csecurity protocols in useDoption DRF range in useEoption Eextent of RF reflections

Which one of the following statements about wireless networks is TRUE? Group of answer choicesThey can be accessible to other users.They limit accessibility to other users.They cannot be intercepted by unknown users.They limit visibility to other users.