Edge Air Interface - Modulation - LG CE500 Service Manual

2. General Performance

2.5 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
• 8-PSK constellation rotates 3 /8 radians per symbol period
• Rotation prevents zero crossings, reducing peak-to-average power
(1,1,1) t = 1
(1,1,1) t = 2
3 /8 radians
(1,1,1) t = 0 (symbols)
(1,1,1) t = 3
...
• Polar transmitter and Direct modulation transmitter Block diagram
Polar transmitter Block diagram
- 9 -