Title :
New bounds for the sum capacity of binary and nonbinary synchronous CDMA systems
Author :
Dashmiz, Sh. ; Takapoui, M.R. ; Pad, P. ; Marvasti, F.
Author_Institution :
Dept. of Electr. Eng., Sharif Univ. of Technol., Tehran, Iran
Abstract :
Lower and upper bounds are derived for the sum capacity of synchronous CDMA where the signature matrix and input alphabets are binary or (2p + 1)-ary, in two cases of noiseless and noisy channels. The bounds are very tight in some regions. Interestingly, simulations show that the formulas for noisy systems tend to the ones for noiseless system as noise tends to 0 while it cannot be deduced easily from the formulas. The results give good insights about the extent of the number of users in which errorless communication is possible for a system with a given chip rate.
Keywords :
channel capacity; code division multiple access; matrix algebra; noiseless channel; noisy channel; sum capacity; synchronous CDMA system; AWGN; Additive white noise; Capacity planning; Code division multiplexing; Gaussian distribution; Gaussian noise; H infinity control; Linear matrix inequalities; Multiaccess communication; Upper bound;
Conference_Titel :
Information Theory Proceedings (ISIT), 2010 IEEE International Symposium on
Conference_Location :
Austin, TX
Print_ISBN :
978-1-4244-7890-3
Electronic_ISBN :
978-1-4244-7891-0
DOI :
10.1109/ISIT.2010.5513400