Question

13.1: Consider four different cellular systems that share the following characteristics. The frequency bands are 825 to 845 MHz for mobile unit transmission and 870 to 890 MHz for base station transmission. A duplex circuit consists of one 30-kHz channel in each direction. The systems are distinguished by the reuse factor, which is 4, 7, 12, and 19, respectively. a. Suppose that in each of the systems, the cluster of cells (4, 7, 12, 19) is duplicated 16 times. Find the number of simultaneous communications that can be supported by each system. (20MHz / 30kHz) * 16

Answer 1

Answer:

The correct answer is - 10.6666 channels.

Explanation:

Given:

numbers of clusters duplicated = 16 times

The frequency bands for mobile unit transmission are - 825 to 845 MHz

The frequency bands for base station transmission = 870 to 890 MHz

The required bandwidth for each one-way direction of channels = 30 kHz

Formula:

the number of simultaneous communications that can be supported by each system $k_{sys}$ = $MB_{CL}$/$b_{ch}$

Solution:

The required bandwidth for each two-way direction of channels = 2 × 30 kHz

then, according to the formula the number of simultaneous communications that can be supported by each system

$k_{sys}$ = $MB_{CL}$/$b_{ch}$

k_{sys} = 16×40/60

[b_{ch} = (845-825) + (890-870) = 20+20=40)]

= 10.6666.