Title :
MLO spreading codes for CDMA systems using DCT/DST
Author :
Zhang, Jingtao ; Matolak, David W.
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Ohio Univ., Athens, OH
Abstract :
We propose the use of the discrete cosine transform (DCT) and discrete sine transform (DST), as well as their inverses, for spreading in multi-carrier (MC) code division multiple access (CDMA) systems. The DCT matrix works as a multi-level orthogonal (MLO) spreading code set. More generally, the DCT can be used in any spread spectrum system including single-carrier CDMA systems, MC-CDMA and MC direct sequence (DS) CDMA. The use of the DCT in MC-CDMA is shown to yield better system performance than traditional binary spreading codes.
Keywords :
code division multiple access; discrete cosine transforms; spread spectrum communication; discrete cosine transform; discrete sine transform; multi-carrier code division multiple access systems; multi-level orthogonal spreading code set; single-carrier CDMA systems; spread spectrum system; Binary codes; Bit error rate; Discrete cosine transforms; Discrete transforms; Maximum likelihood detection; Multiaccess communication; Multicarrier code division multiple access; Spread spectrum communication; System performance; Transmitters; CDMA; DCT; MC-CDMA; MC-DSCDMA; spreading codes;
Conference_Titel :
Radio and Wireless Symposium, 2009. RWS '09. IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-2698-0
Electronic_ISBN :
978-1-4244-2699-7
DOI :
10.1109/RWS.2009.4957447
