Question

[a] With Amplitude Shift Keying (ASK), if 16 different amplitudes are being used, how many bits can be sent at one time?

[b] Show the bits that can be sent at each level.

Answer 1

[a] With Amplitutde Shift Keying (ASK) if we are using 16 different amplitude then we can send 4 bits at a time.

Explanation : Here, since there are 16 amplitudes. Therefore we can use 4 bits ( log₂16=4 ) to represent each different amplitude. Thus we can represent a total of 16 different amplitude if we use 4 bits at a time.

[b] NOTE: The 16 different levels are indexed from 0 to 15

LEVEL BITS

Level 0 => 0000

Level 1 => 0001

Level 2 => 0010

Level 3 => 0011

Level 4 => 0100

Level 5 => 0101

Level 6 => 0110

Level 7 => 0111

   Level 8 => 1000

Level 9 => 1001

Level 10=> 1010

Level 11=> 1011

Level 12=> 1100

Level 13=> 1101

Level 14=> 1110

Level 15=> 1111