Title :
2D orthogonal spreading codes for multicarrier DS-CDMA systems
Author :
Yang, Chia-Ming ; Lin, Pei-Hsuan ; Yang, Guu-Chang ; Kwong, Wing C.
Author_Institution :
Dept. of Electr. Eng., Nat. Chung-Hsing Univ., Taichung, Taiwan
Abstract :
This paper presents two new constructions of two-dimensional (2D) spreading codes, here designated as 2D orthogonal variable spreading factor (OVSF) codes, for multicarrier direct-sequence code-division multiple-access (MC/DS-CDMA) systems. Orthogonality of these spreading codes is employed to improve the bandwidth efficiency and interference rejection capability of the DS-CDMA systems. The 2D OVSF codes are constructed by generalizing one-dimensional (1D) OVSF codes and they possess ideal correlation properties. As illustrated in this paper, these 2D OVSF cods preserve the orthogonality of different spreading factors in an OVSF code tree, supporting multimedia services with a variety of data rates.
Keywords :
3G mobile communication; code division multiple access; codes; interference suppression; radiofrequency interference; spread spectrum communication; 2D orthogonal variable spreading factor codes; 3G mobile communication; bandwidth efficiency; direct-sequence code-division multiple-access; interference rejection; multicarrier DS-CDMA systems; multimedia services; tree structure; 3G mobile communication; Autocorrelation; Bandwidth; Downlink; Frequency; Interference suppression; Multiaccess communication; Multiple access interference; Narrowband; Wideband;
Conference_Titel :
Communications, 2003. ICC '03. IEEE International Conference on
Print_ISBN :
0-7803-7802-4
DOI :
10.1109/ICC.2003.1204049
