NASA NTRS · 19920061609
Rotative quadrature phase-shift keying
Abstract
A rotative quadrature phase-shift keying (RQPSK) modulation scheme is proposed. By rotating the QPSK signal constellation by pi/2, either clockwise or anticlockwise, during a symbol duration, the conventional QPSK scheme can be modified to transmit 3 bits per symbol to achieve both power and bandwidth efficiency.
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Liu, J., Kim, J., Kwatra, S. C., Stevens, G. H.. 1992-06-04. Rotative quadrature phase-shift keying. https://ntrs.nasa.gov/citations/19920061609
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