Title :
Development of TDMA cellular base station equipment
Author :
Uebayashi, Shinji ; Ohno, Koji ; Nojima, Toshio
Author_Institution :
NTT Radio Commun. Syst. Lab., Kanagawa, Japan
Abstract :
The system configuration and base station equipment developed to realize a three-channel TDMA cellular system based on the Japanese standard is described. The frequency band is 900 MHz and, the interleave carrier spacing is 25 kHz. The modulation scheme is π/4-shift QPSK. Developed technologies include extremely low-distortion multicarrier power amplification, modulation/demodulation with diversity reception, and speech processing incorporating VOX control for reducing the power consumption of portable sets. These technologies increase the capacity remarkably, and reduce the size of the base station equipment to one-fifth that of existing analog systems. The cost is also reduced considerably. To ensure high-quality radio transmission performance, a BER of 10-2 is achieved at a median Eb/ N0 of less than 11 dB in fading environments. This ensures robust speech and nonspeech (facsimile/data) transmissions
Keywords :
cellular radio; phase shift keying; radio equipment; telecommunication standards; time division multiple access; π/4-shift QPSK; 11 dB; 900 MHz; Japanese standard; TDMA cellular base station equipment; UHF; VOX control; capacity; diversity reception; extremely low-distortion multicarrier power amplification; fading environments; interleave carrier spacing; portable sets; power consumption; radio transmission performance; speech processing; Base stations; Demodulation; Diversity reception; Energy consumption; Frequency; Process control; Quadrature phase shift keying; Speech processing; Standards development; Time division multiple access;
Conference_Titel :
Vehicular Technology Conference, 1992, IEEE 42nd
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-0673-2
DOI :
10.1109/VETEC.1992.245331
