Title :
Gaussian chip shaping enhances the superiority of Markovian codes in DS/CDMA systems
Author :
Jitsumatsu, Yutaka ; Kohda, Tohru
Author_Institution :
Dept. of Comput. Sci. & Commun. Eng., Kyushu Univ., Fukuoka
Abstract :
It is known that spreading codes generated by a Markov chain improve bit error rate performance of direct sequence/code division multiple access (DS/CDMA) systems if the chip pulse is rectangular. Real analysis tells us that a pair of the rectangular and sine functions is one of Fourier transform and its inverse Fourier transform and vice versa. On the other hand, Gaussian pulses have the self-duality property: they have the same expression in both time and frequency domains. Gaussian chip pulses sacrifice inter-symbol interference. However, the use of Markovian codes together with a Gaussian pulse increases the system performance approximately 30% in terms of the number of users
Keywords :
Fourier transforms; Gaussian processes; Markov processes; code division multiple access; error statistics; frequency-domain analysis; spread spectrum communication; time-domain analysis; DS-CDMA systems; Gaussian chip pulses; Gaussian chip shaping; Markov chains; Markovian codes; bit error rate performance; direct sequence-code division multiple access systems; inter-symbol interference; inverse Fourier transform; self-duality property; Bit error rate; Computer science; Filters; Fourier transforms; Frequency conversion; Frequency domain analysis; Intersymbol interference; Multiaccess communication; Multiple access interference; Pulse shaping methods;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1693285
