%0 Electronic Article %A A. Adinoyi %A S. Al-Semari %A A. Zerguine %K coded I-Q QPSK %K square root Kalman updating algorithm %K mobile radio %K wideband cellular system %K bit error rate %K quadrature phase shift keying %K decision feedback equalisation %X The bit error rate (BER) performance of equalised I-Q quadrature phase-shift keying (QPSK) is evaluated for wideband cellular systems. Decision feedback equalisation with the square-root Kalman updating algorithm is employed for I-Q coded systems. A gain of about 6 dB is achieved in favour of the I-Q scheme compared with the conventional Gray-mapped QPSK at a BER of 10–3. %@ 0013-5194 %T Decision feedback equalisation of coded I-Q QPSK in mobile radio environments %B Electronics Letters %D January 1999 %V 35 %N 1 %P 13-14 %I Institution of Engineering and Technology %U https://digital-library.theiet.org/;jsessionid=2b27c2f0pte6b.x-iet-live-01content/journals/10.1049/el_19990042 %G EN