Title :
Optimal spread spectrum sequences-constructed from Gold codes
Author :
Chen, Chi-Chung ; Yao, Kung ; Biglieri, Ezio
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
This paper derives general results on the partial auto-correlation function of the optimal spreading sequences for asynchronous CDMA systems with respect to the minimization of the average error probability under the standard Gaussian approximation (SGA) condition without the assumption of stationary random processes on the spreading sequences. We construct a family of optimal spreading sequences from the existing Gold codes, which have the same number of codes as a set of Gold codes. An asynchronous CDMA system using such optimal spreading sequences allows 15% more users than when purely random binary sequences or Gold codes are employed. Moreover, the acquisition time performance of the proposed optimal spreading sequences is also shown to be better than that of Gold codes
Keywords :
Gaussian processes; code division multiple access; correlation theory; error statistics; minimisation; sequential codes; spread spectrum communication; Gold codes; acquisition time performance; asynchronous CDMA systems; average error probability; minimization; optimal spread spectrum sequences; partial auto-correlation function; standard Gaussian approximation; Autocorrelation; Binary sequences; Chaotic communication; Error probability; Gaussian approximation; Gold; Multiaccess communication; Random processes; Spread spectrum communication; System performance;
Conference_Titel :
Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-6451-1
DOI :
10.1109/GLOCOM.2000.891262
