Title :
Design of 16-QAM ZCZ sequences for AS-CDMA communication systems using the 16-QAM constellation
Author :
Zeng, Fanxin ; Zhang, Zhenyu
Author_Institution :
Department of Information Engineering, Chongqing Communication Institute, 400035, China
Abstract :
It is pointed out that when a communication system makes use of sequences over the quadrature amplitude modulation (QAM) constellation as its spreading sequences, in comparison with the traditional spreading sequences with the same length of sequences, the transmission data rate (TDR) of the system by applying to the former is several multiples of one by using the latter. In this paper, two families of 16-QAM ZCZ sequences are presented, and the resultant sequences can arrive at the theoretical bound on the ZCZ sequences under their own conditions. When the proposed sequences are employed by an AS-CDMA communication system using the 16-QAM constellation as spreading sequences, the high TDR of the system holds without both multiple access interference (MAI) and multi-path interference (MPI).
Keywords :
Correlation; Interference; Multiaccess communication; Multiple access interference; Quadrature amplitude modulation; Synchronization; 16-QAM sequence; AS-CDMA; quadriphase sequence; theoretical bound; zero correlation zone (ZCZ);
Conference_Titel :
Information Science and Engineering (ICISE), 2010 2nd International Conference on
Conference_Location :
Hangzhou, China
Print_ISBN :
978-1-4244-7616-9
DOI :
10.1109/ICISE.2010.5689774
