Title :
A new polyphase sequence with perfect even and good odd cross-correlation functions for DS/CDMA systems
Author :
Park, So Ryoung ; Song, Iickho ; Yoon, Seokho ; Lee, Jooshik
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
fDate :
9/1/2002 12:00:00 AM
Abstract :
A class of polyphase signature sequences for direct-sequence code-division multiple-access (DS/CDMA) systems is proposed. The proposed class has zero periodic (=even) cross-correlation (CC) function and approximate maximum magnitude N/π of odd cross-correlation (OCC), where N is the length of sequences. Although the maximum magnitude is relatively large, it is observed that the maximum magnitude has little effect on the performance of the DS/CDMA system, since its frequency is very low. The performance of the proposed sequence in DS/CDMA systems is investigated and shown to be better than that of other sequences for an asynchronous additive white Gaussian noise channel environment with and without Rayleigh multipath fading.
Keywords :
AWGN channels; Rayleigh channels; code division multiple access; multipath channels; sequences; spread spectrum communication; DS-CDMA; Rayleigh fading; additive white Gaussian noise channel; asynchronous channel; direct-sequence code-division multiple-access; even cross-correlation function; multipath fading; odd cross-correlation function; polyphase sequence; signature sequences; Additive white noise; Channel capacity; Degradation; Design methodology; Direct-sequence code-division multiple access; Frequency; Multiaccess communication; Multiple access interference; Performance analysis; Rayleigh channels;
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2002.800636
