In an advance mobile phone system (AMPS), which of the following separate channels in a link is/are used? 

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UPSC ESE (Prelims) Electronics and Telecommunication Engineering 19 Feb 2023 Official Paper
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  1. TDMA only 
  2. FDMA only 
  3. SDMA only 
  4. Both TDMA and FDMA

Answer (Detailed Solution Below)

Option 2 : FDMA only 
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Detailed Solution

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AMPS (advance mobile phone system):

AMPS utilizes FDMA (Frequency Division Multiple Access) to separate channels in a link. In FDMA, different users are assigned different frequency channels, allowing simultaneous communication on separate frequencies within the same geographic area. The division of frequency resources enables multiple users to share the communication network efficiently. 

Here, option 2 is correct.

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