Title :
π/4-shift QPSK coherent detection demodulator for TDMA/TDD systems
Author :
Matsumoto, Y. ; Kubota, S. ; Morikura, M. ; Kato, S.
Author_Institution :
NTT Radio Commun. Syst. Lab., Kanagawa, Japan
Abstract :
A π/4-shifted quadrature phase shift keying (QPSK) coherent detection demodulator for microcellular time division multiple access/time division duplexing (TDMA/TDD) systems is proposed. The demodulator employs a reverse-modulation type carrier recovery circuit with a -π/4 signal phase rotator for coherent detection, and an initial clock recovery circuit for fast synchronization of transmitted bursts. Computer simulation results show that coherent detection with the proposed carrier recovery circuit reduces the irreducible frame error rate by 50% compared with differential detection and achieves a 4-dB improvement at a frame error rate of 10-2 with transmission diversity in the fading channel typical of personal communication
Keywords :
cellular radio; demodulators; diversity reception; fading; land mobile radio; personal communication networks; quadrature phase shift keying; synchronisation; time division multiple access; π/4 QPSK; TDMA/TDD systems; clock recovery circuit; coherent detection demodulator; fading channel; irreducible frame error rate; microcellular radio; personal communication; quadrature phase shift keying; reverse-modulation type carrier recovery circuit; synchronization; time division duplexing; time division multiple access; transmission diversity; Circuits; Clocks; Computer simulation; Demodulation; Error analysis; Fading; Phase detection; Quadrature phase shift keying; Synchronization; Time division multiple access;
Conference_Titel :
Vehicular Technology Conference, 1993., 43rd IEEE
Conference_Location :
Secaucus, NJ
Print_ISBN :
0-7803-1267-8
DOI :
10.1109/VETEC.1993.507495
