Title :
A π/4-shifted DQPSK demodulator for a personal mobile communications system
Author :
Furukawa, H. ; Matsuyama, K. ; Sato, T. ; Takenaka, T. ; Takeda, Y.
Author_Institution :
Fujitsu Labs. Ltd., Kawasaki, Japan
Abstract :
A digital 384-kbps TDMA-TDD microcellular system using π/4-shifted DQPSK modulation is under development in Japan. To simplify the demodulator´s configuration using this system and to reduce its power consumption, the authors propose a π/4-shifted DQPSK demodulator that includes what they call an arctangent differential detector (ATN-DD) and an arctangent automatic frequency controller (ATN-AFC) because they process the phase of the received signal rather than the quadrature components. They present the configuration and the principles of operation of the ATN-DD and the ATN-AFC and show the results of BER and AFC performance testing. In addition, they investigate the most suitable AFC structure. Their study enabled a differential detector and AFC circuit gate-count reduction of more than 60%
Keywords :
automatic frequency control; cellular radio; demodulators; digital radio systems; personal communication networks; phase shift keying; time division multiple access; π/4-shifted DQPSK demodulator; π/4-shifted DQPSK modulation; 384 kbit/s; AFC circuit; Japan; TDMA-TDD microcellular system; arctangent automatic frequency controller; arctangent differential detector; gate count reduction; performance testing; personal mobile communications system; phase; power consumption; Automatic frequency control; Bit error rate; Circuit testing; Control systems; Demodulation; Digital modulation; Energy consumption; Phase detection; Phase frequency detector; Signal processing;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1992. Proceedings, PIMRC '92., Third IEEE International Symposium on
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-0841-7
DOI :
10.1109/PIMRC.1992.279859
