Oqpsk

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Mansour Naslcheraghi

Offset Quadrature Phase Shift Keying

Engineering

Contents
1. Drawback of QPSK Modulation
2. OQPSK Modulation
Digital Modulation Schemes (OQPSK) 1 / 7

Drawback of QPSK Modulation
Transmitting binary sequence
11000111
split
11 , 00 , 01 , 11
in-phase (I) component
of the signal
the quadrature (Q)
component of the signal
Signal Duration = 2Tb
Digital Modulation Schemes (OQPSK) 2 / 7

Drawback of QPSK Modulation
1 , 0 , 0 , 1
In-phase components for QPSK
1 , 0 , 1 , 1
quadrature components for QPSK
11 , 00 , 01 , 11
Note that changes
can occur only at
even multiples of Tb
both I and Q
components
change
simultaneously
resulting in a
change of 180◦
in the phase !
Digital Modulation Schemes (OQPSK) 3 / 7

Drawback of QPSK Modulation (Application)
180◦ phase changes cause abrupt changes in the signal,
resulting in large spectral side lobes.
In high amplifiers and for certain satellite applications,
OQPSK offers better performance
Digital Modulation Schemes (OQPSK) 4 / 7

Solution (QPSK modified to became OQPSK)
misaligned by Tb
The OQPSK signal can be written as:
Digital Modulation Schemes (OQPSK) 5 / 7

Solution (QPSK modified to became OQPSK)
A possible mapping for QPSK signal.
Possible phase transitions in QPSK signaling.
Phase transition diagram for OQPSK signaling.
Results:
1. prevents both components changing at the
same time
2. In constellation-speak, if the signal wave in the
right upper quadrant, the next signal can only
go to either the lower right quadrant or to upper left
quadrant but not across.
But in QPSK all transitions can occur.
Digital Modulation Schemes (OQPSK) Company nam6e / 7

Solution (QPSK modified to became OQPSK)
The absence of 180◦ phase jump is, however, offset by more
frequent ±90◦ phase shifts
Digital Modulation Schemes (OQPSK) Company nam7e / 7

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Oqpsk

1. Digital Modulation schemes OQPSK Offset Quadrature Phase-shift keying Shahid Beheshti Univ. of Tehran Faculty of electrical and computer engineering Department of Electrical Engineering Instructor: M. Naslcheraghi Assistant Professor: Dr. Sadough LOGO October 2014

2. Contents 1. Drawback of QPSK Modulation 2. OQPSK Modulation Digital Modulation Schemes (OQPSK) 1 / 7

3. Drawback of QPSK Modulation Transmitting binary sequence 11000111 split 11 , 00 , 01 , 11 in-phase (I) component of the signal the quadrature (Q) component of the signal Signal Duration = 2Tb Digital Modulation Schemes (OQPSK) 2 / 7

4. Drawback of QPSK Modulation 1 , 0 , 0 , 1 In-phase components for QPSK 1 , 0 , 1 , 1 quadrature components for QPSK 11 , 00 , 01 , 11 Note that changes can occur only at even multiples of Tb both I and Q components change simultaneously resulting in a change of 180◦ in the phase ! Digital Modulation Schemes (OQPSK) 3 / 7

5. Drawback of QPSK Modulation (Application) 180◦ phase changes cause abrupt changes in the signal, resulting in large spectral side lobes. In high amplifiers and for certain satellite applications, OQPSK offers better performance Digital Modulation Schemes (OQPSK) 4 / 7

6. Solution (QPSK modified to became OQPSK) misaligned by Tb The OQPSK signal can be written as: Digital Modulation Schemes (OQPSK) 5 / 7

7. Solution (QPSK modified to became OQPSK) A possible mapping for QPSK signal. Possible phase transitions in QPSK signaling. Phase transition diagram for OQPSK signaling. Results: 1. prevents both components changing at the same time 2. In constellation-speak, if the signal wave in the right upper quadrant, the next signal can only go to either the lower right quadrant or to upper left quadrant but not across. But in QPSK all transitions can occur. Digital Modulation Schemes (OQPSK) Company nam6e / 7

8. Solution (QPSK modified to became OQPSK) The absence of 180◦ phase jump is, however, offset by more frequent ±90◦ phase shifts Digital Modulation Schemes (OQPSK) Company nam7e / 7

9. Thank You Reference: Digital Communicationm, John G. Proakis , Masoud Salehi Direct Download link: www.Teleinfra.net/OQPSK.pptx www.Teleinfra.net/OQPSK.pdf LOGO Email: M.naslcheraghi@Teleinfra.net M.naslcheraghi@mail.sbu.ac.ir MRTwww.Win2Farsi.com

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