Question

If a total of 33 MHz of bandwidth is allocated to a particular FDD cellular telephone system which uses two 25 kHz simplex channels to provide full duplex voice and control channels, compute the number of channels available per cell if a system uses 4-cell reuse.

Answer 1

Answer:

Cellular system : FDD

Total bandwidth : 30MHZ

Channel bandwidth = 25Khz∗2Simplex Channels

= 50Khz/duplex channels

Therefore,

Total available channels = 30,00050 = 600Channels

For N=4

Total no. of channels = 6004 = 150Channels available per cell.

For N=7

Total no. of channels = 6007 = 85Channels available per cell.

For N=12

Total no. of channels = 60012 = 50Channels available per cell.

For N=13

Total no. of channels = 60013 = 46Channels available per cell

Answer 2

each cell would have access to 330 channels, which can be used to provide full duplex voice and control channels, using two 25 kHz simplex channels.

• In a Frequency Division Duplex (FDD) cellular telephone system, the total bandwidth is divided into two frequency bands, one for the uplink (mobile unit to base station) and one for the downlink (base station to mobile unit) communication.
• Given that the total bandwidth allocated is 33 MHz and each channel has a bandwidth of 25 kHz, we can calculate the total number of channels available as:
• 33 MHz / 25 kHz = 1320 channels (approx)
• In a 4-cell reuse system, the same frequency band is used in all the cells, but with a different phase offset to avoid interference. This means that the available channels are divided among 4 cells, so the number of channels available per cell is:
• 1320 channels / 4 cells = 330 channels per cell
• In this scenario, each cell would have access to 330 channels, which can be used to provide full duplex voice and control channels, using two 25 kHz simplex channels.

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