ECE5884 Wireless Communications – Quiz 10 3 October 2022
1. (Co-channel interference). Consider a regular hexagonal cell deploy- ment, where the mobile stations (MSs) and base stations (BSs) use omni- directional antennas, as shown in Figure 1. Consider only the first tier of
^
^
Copyright By PowCoder代写 加微信 powcoder
D Dh
^
^
^
^
Figure 1: Worst case co-channel interference on the downlink (DL) channel.
co-channel interferes. Ignore the effects of shadowing and multipath fad- ing. Assume that the propagation path loss is described by the simplified path-loss model (refer the class note).
^ ^
^
(a) Determine the worst-case downlink (DL) carrier-to-interference ratio, CI ,
for cluster sizes N = 3, 4, 7 when the path loss exponent is 3.5.
Hint: Distances from six interfering BSs are
{2R, 7R, 7R,
{√7R, √7R, √13R, √13R, √19R, √19R} when N = 4 {√13R, 4R, √19R, 5R, √28R, √31R} when N = 7 where R is the radius of the cells.
the carrier-to-interference ratio at radio receivers are 5 dB and 10.5 dB? 1
13R, 13R, 4R} when N = 3
(b) What are the minimum cluster sizes that are needed if threshold levels of
程序代写 CS代考 加微信: powcoder QQ: 1823890830 Email: powcoder@163.com