Title :
A multi-carrier CDMA system design based on orthogonal complementary codes
Author :
Magaña, Mario Edgardo ; Liu, Huaping
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Corvallis, OR, USA
Abstract :
The paper presents a new and efficient QAM modem design for a multiple user wireless mobile communication system; it improves the performance of a recently developed nontraditional offset stacked CDMA spread spectrum modulation scheme. The spectrum spreading is performed using orthogonal complementary codes (OCC) in an offset stacked fashion in order to achieve very low multiple access interference (MAI) without sacrificing the data transmission rate. In order to deliver good performance in a fading environment, the one-dimensional PAM signal output by the offset stacked modulator is mapped onto an optimally designed two-dimensional QAM constellation before transmission.
Keywords :
cellular radio; code division multiple access; codes; data communication; fading channels; modems; multiuser channels; pulse amplitude modulation; quadrature amplitude modulation; radiofrequency interference; spread spectrum communication; MAI; QAM modem; cellular mobile communication; data transmission rate; multi-carrier CDMA; multiple access interference; multiple user mobile communication system; offset stacked CDMA; one-dimensional PAM signal; orthogonal complementary codes; spread spectrum modulation; two-dimensional QAM constellation; Data communication; Fading; Mobile communication; Modems; Multiaccess communication; Multiple access interference; Quadrature amplitude modulation; Signal design; Spread spectrum communication; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th
Print_ISBN :
0-7803-7954-3
DOI :
10.1109/VETECF.2003.1285247
