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IS-136 uses which modulation technique?(a) π/4 DQPSK(b) BPSK(c) GMSK(d) AFSKI got this question in examination.My question is based upon Second Generation (2G) Cellular Networks in portion Modern Wireless Communication Systems of Wireless/Mobile

Answer»

Right choice is (a) π/4 DQPSK

For EXPLANATION: IS-136 USES π/4 DQPSK modulation technique. This technique allows a BIT rate of 48.6 Kbit/s with 30 KHz CHANNEL spacing which gives a bandwidth EFFICIENCY of 1.62 bit/s/Hz.



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