Title :
New cross-correlation results for multi-rate CDMA
Author :
Hamelin, Eric ; Rusch, Leslie A. ; Fortier, Paul
Author_Institution :
Dept. of Electr. & Comput. Eng., Laval Univ., Que., Canada
Abstract :
Support of multiple data services can be accomplished via code division multiple access (CDMA) with a constant chip rate, but variable data rates. We present exact equations for the cross-correlation of codes in a multiple-data rate system, and thus equations for the multiple access interference (MAI) and bit error rate (BER). Previous analysis has found the EER using the mean of the MAI assuming codes are truly random sequences. We show that Gold and Kasami sequences have a cross-correlation with a distribution closely approximated by a Gaussian one, and present confidence intervals to quantify the performance under the random code assumption
Keywords :
Gaussian distribution; code division multiple access; coding errors; correlation methods; error statistics; phase shift keying; pseudonoise codes; radiofrequency interference; random processes; sequences; spread spectrum communication; BER; BPSK; Gaussian distribution; Gold sequences; Kasami sequences; MAI; binary phase shift keying; bit error rate; code division multiple access; confidence intervals; constant chip rate; cross-correlation results; direct sequence CDMA; exact equations; multi-rate CDMA; multiple access interference; multiple data services; multiple-data rate; random code assumption; random sequences; variable data rates; Bandwidth; Binary phase shift keying; Bit error rate; Equations; Gold; Multiaccess communication; Multiple access interference; Pulse shaping methods; Random variables; Video sharing;
Conference_Titel :
Communications, 1998. ICC 98. Conference Record. 1998 IEEE International Conference on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-4788-9
DOI :
10.1109/ICC.1998.685099
