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Digital Pulse Position Modulation

 

Pulse Position Modulation Example (Digital Method)

Bits per symbol: m = 3

Number of slots per symbol duration: M = 2^m = 2^3 = 8

Example symbol: 101 → decimal 5 → pulse sent in slot 5 (out of 0…7)

Symbol duration: T_s = 8 ms → each time slot: T_slot = T_s / M = 8 / 8 = 1 ms

Pulse for symbol 101 is transmitted between 5 ms and 6 ms.

Timeline representation of 3-bit PPM
Slot: 0   1   2   3   4   5   6   7
Time: 0-1 1-2 2-3 3-4 4-5 5-6 6-7 7-8 ms
Pulse →                           █
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