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DEFINITION: Staggered quadrature phase-shift keying (SQPSK), also known as offset quadrature phase-shift keying (OQPSK), is a method of phase-shift keying (PSK) in which the signal carrier-wave phase transition is always 90 degrees or 1/4 cycle at a time. A phase shift of 90 degrees is known as phase quadrature.In SQPSK, the data is placed alternately on two channels or streams called the I channel (for "in  … 
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Data Transmission Standards Multimedia (View All Report Types)
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Posted: 14 Jun 2010 | Premiered: 14 Jun 2010

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DATA TRANSMISSION STANDARDS DEFINITION (continued): …  phase") and the Q channel ("phase quadrature"). A single phase transition can never exceed 90 degrees. This property contrasts SQPSK with conventional quadrature phase-shift keying (QPSK), in which the phase can sometimes change by 180 degrees (two 90-degree shifts in a single transition). The average magnitude of the phase transitions is smaller with SQPSK than with conventional QPSK. The result of the smaller average phase "jump" is an improved signal-to-noise ratio (SNR) and a reduced error rate.SQPSK and QPSK are not the only methods of PSK in common use. In binary … 
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