
EDGE Air Interface - Modulation
• 8-PSK modulation is used for high data rates
• Signal trajectory will pass through the origin
• High peak-to-average ratio
(1,1,1) t = 0 (symbols)
(1,1,1) t = 1
(1,1,1) t = 2
(1,1,1) t = 3
3S/8 radians
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EDGE Air Interface - Modulation
1. 8-PSK constellation rotates 3 / 8 radians per symbol period
2. Rotation prevents zero crossings, reducing peak-to-average
power
S
10
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