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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
• Polar transmitter and Direct modulation transmitter Block diagram
Polar transmitter Block diagram
(1,1,1) t = 0 (symbols)
(1,1,1) t = 1
(1,1,1) t = 2
(1,1,1) t = 3
3 /8 radians
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Summary of Contents for CE500
Page 3: ... 4 Z 3 X B O X C O M ...
Page 77: ...4 TROUBLE SHOOTING 78 5 Check Tx I Q TXQP TXQN TXIN TXIP U704 Test Point Z 3 X B O X C O M ...
Page 85: ...Note 86 Z 3 X B O X C O M ...
Page 93: ... 94 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 94: ... 95 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 95: ... 96 Z 3 X B O X C O M ...
Page 103: ...9 CALIBRATION 104 L Standalone Test Equipment Setup Oscilloscope Z 3 X B O X C O M ...
Page 105: ... 106 Z 3 X B O X C O M ...
Page 127: ...Note 128 Z 3 X B O X C O M ...