Title :
Time spread modulation system for land mobile radio communications
Author :
Kato, Eiji ; Sasaoka, Hideichi
Author_Institution :
Nat. Police Agency, Tokyo, Japan
Abstract :
A novel time spread modulation (TSM) scheme which uses the time diversity effect is presented. Several modifications are proposed to the standard TSM scheme to allow it to be used in land mobile radio communications. Quadrature amplitude modulation with fading compensation is applied to increase the spectral efficiency. Symbol interleave and maximum likelihood estimation are applied to improve TSM performance under Rayleigh fading conditions. Computer simulation shows that the proposed TSM scheme can provide a large process gain in land mobile radio communications
Keywords :
amplitude modulation; diversity reception; fading; mobile radio systems; QAM; Rayleigh fading; TSM performance; fading compensation; land mobile radio communications; large process gain; maximum likelihood estimation; quadrature amplitude modulation; spectral efficiency; symbol interleave; time diversity effect; time spread modulation; Bandwidth; Bit error rate; Computer simulation; Diversity methods; Hardware; Land mobile radio; Mobile communication; Rayleigh channels; Signal processing; Space technology;
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.1991.140554
