Title :
Quasi-Orthogonal Multi-Carrier CDMA
Author :
Jitsumatsu, Yutaka ; Kohda, Tohru
Author_Institution :
Dept. of Comput. Sci. & Commun. Eng., Kyushu Univ., Fukuoka
Abstract :
It is believed that the dimension of the signal space with interval T and bandwidth W is 2WT, while we cannot make the out-of-band and out-of-time energies of any waveform zero. We propose a Gaussian pulse shaping for multi-carrier CDMA systems to utilize the time and frequency resources effectively. Gaussian pulses have ICI and ISI; they are not orthogonal. Markovity of spreading codes save the drawback of ICI and ISI. Overlapped Gaussian pulses increase the spectral efficiency.
Keywords :
Gaussian channels; code division multiple access; pulse shaping; Gaussian pulse shaping; multi carrier CDMA; out-of-band energies; out-of-time energies; quasi orthogonal; spectral efficiency; Bandwidth; Computer science; Filters; Frequency; Intersymbol interference; Multiaccess communication; OFDM; Pulse modulation; Pulse shaping methods; Shape;
Conference_Titel :
Global Telecommunications Conference, 2008. IEEE GLOBECOM 2008. IEEE
Conference_Location :
New Orleans, LO
Print_ISBN :
978-1-4244-2324-8
DOI :
10.1109/GLOCOM.2008.ECP.229
