Title :
Adaptive modulation/TDMA scheme for personal multimedia communication systems
Author :
Sampei, Seiichi ; Komaki, Shozo ; Morinaga, Norihiko
Author_Institution :
Fac. of Eng., Osaka Univ., Japan
fDate :
28 Nov- 2 Dec 1994
Abstract :
The development of digital land mobile communication techniques makes it possible to use most of the modulation techniques. This paper proposes an adaptive modulation/TDMA scheme to achieve high capacity personal multimedia communication systems. TDMA is used to cope with various bit rate for multimedia services, and the modulation scheme is selected from 1/4-rate QPSK, 1/2-rate QPSK, QPSK, 16QAM and 64QAM according to the received C/Ic (power ratio of the desired signal to the co-channel interference) and the delay spread. Computer simulation confirms that the proposed system can achieve 3.5 times higher spectral efficiency than that of the conventional QPSK systems at the outage probability of 10%, and the proposed system is also effective to improve the delay spread immunity
Keywords :
adaptive systems; cochannel interference; digital radio; land mobile radio; multimedia communication; personal communication networks; quadrature amplitude modulation; quadrature phase shift keying; radio spectrum management; radiofrequency interference; time division multiple access; 1/2-rate QPSK; 1/4-rate QPSK; 16QAM; 64QAM; adaptive modulation/TDMA; bit rates; co-channel interference; computer simulation; delay spread immunity; desired signal; digital land mobile communication; multimedia services; outage probability; personal multimedia communication systems; power ratio; spectral efficiency; Bit rate; Computer simulation; Delay; Digital modulation; Interchannel interference; Mobile communication; Multimedia communication; Multimedia systems; Quadrature phase shift keying; Time division multiple access;
Conference_Titel :
Global Telecommunications Conference, 1994. GLOBECOM '94. Communications: The Global Bridge., IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-1820-X
DOI :
10.1109/GLOCOM.1994.512806
