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GPRS : General Packet Radio System - page 11 / 20

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11 / 20

Networks: L17

11

GMSK : one bit per symbol

»

equivalent to 2-phase modulation

8-Phase Shift Keying : coded using eight phases – gives three bits per symbol

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three consecutive bits mapped into one symbol

»

more susceptible to misinterpretation – Shannon’s theorem etc.

»

under good reception conditions, better throughput

»

under poor reception conditions, the extra bits can be used to add more error-correcting coding, and the correct information recovered

»

in the worst reception conditions, GMSK better

­

EDGE therefore defines a mixture of GMSK and 8-PSK modulation

(0,1,0)

(0,1,1)

(1,1,1)

(1,1,0)

(1,0,0)

(1,0,1)

(0,0,1)

(0,0,0)

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