Title :
Performance of trellis coded 16 QAM/TDMA system for land mobile communications
Author_Institution :
Minist. of Posts & Telecom., Tokyo
Abstract :
The author proposes a six-channel TDMA (time-division multiple access) system using trellis-coded 16 QAM (quadrature amplitude modulation) to support a wide variety of services, including voice facsimile, and ISDN (integrated services digital network) terminals in land mobile communication systems. This system can transmit six voice channels (8 kb/s) per carrier with a carrier spacing of 25 kHz. A pilot-symbol insertion-type fading estimation method, space diversity, symbol interleaving, and two carrier frequency-hopping techniques are applied to this system for improving the transmission performance. Computer simulation confirms that the BER (bit-error-rate) performance and the spectral efficiency of the proposed TDMA system are superior to those of the π/4-QPSK (quadrature phase-shift keying) system
Keywords :
amplitude modulation; channel capacity; diversity reception; error correction codes; error statistics; fading; frequency agility; mobile radio systems; time division multiple access; BER performance; ISDN; bit-error-rate; channel capacity; facsimile; land mobile communications; pilot-symbol insertion-type fading estimation method; quadrature amplitude modulation; six-channel TDMA system; space diversity; spectral efficiency; symbol interleaving; time-division multiple access; transmission performance; trellis coded 16 QAM/TDMA system; two carrier frequency-hopping techniques; voice channels; Diversity methods; Facsimile; Fading; Frequency diversity; Frequency estimation; ISDN; Interleaved codes; Mobile communication; Quadrature amplitude modulation; Time division multiple access;
Conference_Titel :
Global Telecommunications Conference, 1990, and Exhibition. 'Communications: Connecting the Future', GLOBECOM '90., IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-87942-632-2
DOI :
10.1109/GLOCOM.1990.116820
