Title :
Experimental results of a multi-mode adaptive modulation/TDMA/TDD system for high quality and high bit rate wireless multimedia communication systems
Author :
Sampei, Seiichi ; Morinaga, Norihiko ; Hamaguchi, Kiyoshi
Author_Institution :
Dept. of Commun. Eng., Osaka Univ., Japan
Abstract :
This paper reports laboratory experimental results of a time division multiple access/time division duplex-based multi-mode adaptive modulation system (multi-mode AMS/TDMA/TDD) to support high quality and high bit rate wireless multimedia communication services under frequency selective fading conditions. The developed system includes fixed-rate quaternary phase shift keying (QPSK), 16-ary quadrature amplitude modulation (16QAM) and 64QAM to support constant bit rate media using a slowAMS, as well as two types of the fast AMS, i.e., a symbol-rate and modulation level controlled AMS (SM-AMS) and an AMS with a punctured convolutional code (AMS-PC), to support high quality and high bit rate data communication. The results confirm that the AMS-PC can achieve 1 Mbit/s transmission with its BER<10-5 under frequency selective fading conditions with its delay spread of less than 250 ns and fd of less than 5 Hz. The results also suggest that it is effective to adaptively select QPSK and AMS-PC according not only by the supported media but also by the terminal mobility
Keywords :
adaptive modulation; convolutional codes; delays; error statistics; fading channels; multimedia communication; personal communication networks; quadrature amplitude modulation; quadrature phase shift keying; time division multiple access; 1 Mbit/s; 16-ary quadrature amplitude modulation; 16QAM; 64QAM; QPSK; constant bit rate; delay spread; fast AMS; frequency selective fading; high bit rate data communication; high quality systems; laboratory experimental results; modulation level control; multi-mode AMS/TDMA/TDD; multi-mode adaptive modulation; multi-mode adaptive modulation/TDMA/TDD system; personal communications; punctured convolutional code; quaternary phase shift keying; slowAMS; symbol-rate control; terminal mobility; time division duplex; time division multiple access; wireless multimedia communication systems; Adaptive systems; Bit rate; Fading; Laboratories; Multimedia communication; Multimedia systems; Quadrature amplitude modulation; Quadrature phase shift keying; Time division multiple access; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 1998. VTC 98. 48th IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-4320-4
DOI :
10.1109/VETEC.1998.683720