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Question. 1                                                                                                                         (5 Marks)

 

Consider four different cellular systems that share the following characteristics. The frequency bands are 725 to 745 MHz for mobile unit transmission and 770 to790 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 6, 8, 14, and 18, respectively. However, the total number of channel available is k= BcL / bch = 666. Find the number of simultaneous communications that can be supported by a single cell in each system.

 

Note: Mention all necessary formulas and steps for calculation with proper units.

 

Question. 2                                                                                                                           (5 Marks)

 

Consider an MFSK scheme with fc = 150 kHz, fd = 15 kHz, and M = 4, k=2. You are required to apply FHSS to this MFSK scheme with k = 2, that is, the system will hop among four different carrier frequencies. Calculate the total bandwidth (Ws) of the system.

 

Note: Mention all necessary formulas and steps for calculation with proper units.

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