Digital Modulation Techniques in Mobile Communications

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• Constellation diagram for QPSKwith Gray coding. Each adjacentsymbol only differs by one bit.• QPSK can encode two bits persymbol, shown in the diagramwith Gray coding to minimize theBER twice the rate of BPSK.• QPSK may be used either todouble the data rate comparedto a BPSK system whilemaintaining the bandwidth of thesignal or to maintain the datarateof BPSK but halve thebandwidth needed.
QPSKModeled as two BPSK systems inparallel•Imx0 1 1 1 0 0 1 0Serial toParallelConverterR b1 1 0 0R b /20 1 0 1xR b /2cos ω c t90xT s =2 T b-+ BPF•xxxReFahredd'n Sadikoglu 13
Page 1 and 2: Digital Modulation Techniques inMob
Page 3 and 4: Modulation Techniques• Modulation
Page 5 and 6: Amplitude Shift Keying (ASK)- Pulse
Page 7 and 8: Phase Shift Keying (PSK)- Binary Ph
Page 9 and 10: Multi-PhaseBinary Phase ShiftKeying
Page 11: Quadrature Phase-Shift Keying(QPSK)
Page 15 and 16: QPSK TYPESFahredd'n Sadikoglu 15
Page 17 and 18: Fahredd'n Sadikoglu 17
Page 19 and 20: OQPSKBit transitions occur every T
Page 21 and 22: OPSKFahredd'n Sadikoglu 21
Page 23 and 24: QPSK & OQPSK0 1 1 1 0 0 0 1(-1, 1)(
Page 25 and 26: π/4-QPSKDual constellation diagram
Page 27 and 28: Minimum Shift Keying (MSK)• It is
Page 29 and 30: MSKMSK uses changes in phase to rep
Page 31 and 32: ● If it assumed that h = 1/2, the
Page 33 and 34: MSK better than QPSKEven though the
Page 35 and 36: MSKFahredd'n Sadikoglu 35
Page 37 and 38: As can be seen from above, GMSKs po
Page 43 and 44: The figure shows the 16-bit NRZ (No
Page 45 and 46: • The figure shows the MSK and GM
Page 47 and 48: (5)Frequency offset:* This refers t
Page 49 and 50: How to implement a GMSK modulator?F
Page 51 and 52: GSM Modulation SpecificationsIn the

Digital Modulation Techniques in Mobile Communications

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