Title :
Baseband pulse shaping techniques for π/4-DQPSK in nonlinearly amplified land mobile channels
Author :
Subasinghe-Dias, Dileeku ; Feher, Kamilo
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., California Univ., Davis, CA, USA
Abstract :
The application of two baseband pulse shaping techniques to improve the spectral efficiency obtained by π/4-DQPSK (differential quadrature phase shift keying) in a nonlinearly amplified land mobile environment is examined. The spectral and bit error rate (BER) performance of these techniques is studied through computer-aided design techniques. It is demonstrated that, by using the shaping methods considered. π/4-QORC (quadrature overlapped raised cosine) and π/4-CTPSK (controlled transition PSK), the spectral regeneration after nonlinear amplification can be reduced significantly. Thus, the schemes studied allow closer channel spacing compared to π/4-DQPSK, the current standard modem scheme for the US digital mobile communications system
Keywords :
amplification; digital radio systems; mobile radio systems; phase shift keying; π/4-CTPSK; π/4-DQPSK; π/4-QORC; baseband pulse shaping; bit error rate; closer channel spacing; controlled transition PSK; differential quadrature phase shift keying; land mobile radio; nonlinear amplification; quadrature overlapped raised cosine; spectral efficiency; spectral regeneration; Application software; Baseband; Bit error rate; Channel spacing; Communication system control; Design automation; Differential quadrature phase shift keying; Phase shift keying; Pulse shaping methods; Shape control;
Conference_Titel :
Vehicular Technology Conference, 1991. Gateway to the Future Technology in Motion., 41st IEEE
Conference_Location :
St. Louis, MO
Print_ISBN :
0-87942-582-2
DOI :
10.1109/VETEC.1991.140597
