Title :
A development of GMSK/TDMA system with CMA adaptive array for land mobile communications
Author :
Ohgane, Takeo ; Sasaoka, Hideichi ; Matsuzawa, Naoto ; Takeda, Kazuhiro ; Shimura, Takanori
Abstract :
The authors describe a hardware implementation of a GMSK/TDMA (Gaussian minimum-shift keying/time-division multiple-access) communication system and show the bit error rate (BER) performance of the system. This system employs a modulation data rate of 256 kb/s and accommodates 24 users/carrier. In order to reduce the effect of multipath fading, an adaptive array which has four antenna elements is implemented using a digital beamforming concept. All signal processing is carried out by digital signal processors. In an AWGN (additive white Gaussian noise) channel, this system has a 6-dB gain in input power at a BER of 1.0×10-3 compared with the ordinary system with only one antenna. A field test shows that the gain at a BER of 1.0×10-3 becomes 20 dB in a flat fading channel
Keywords :
antenna phased arrays; minimum shift keying; mobile radio systems; time division multiple access; 20 dB; 256 kbit/s; 6 dB; AWGN; BER; CMA adaptive array; GMSK/TDMA system; Gaussian minimum-shift keying; additive white Gaussian noise; antenna array; bit error rate; constant modulus algorithm; digital beamforming; digital signal processors; flat fading channel; hardware implementation; land mobile communications; multipath fading; time-division multiple-access; AWGN; Adaptive arrays; Adaptive signal processing; Adaptive systems; Antenna arrays; Array signal processing; Bit error rate; Fading; Hardware; Time division multiple access;
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.1991.140470
