Title :
M-ary system using complete complementary sequences composed of 4-phase orthogonal sequences
Author :
Kawamoto, Junichiro ; Suehiro, Naoki ; Torii, Hideyuki ; Kuroyanagi, Noriyoshi ; Fan, Pingzhi
Author_Institution :
Graduate Sch. of Eng., Tsukuba Univ., Ibaraki, Japan
Abstract :
Enlarged periodic complete complementary sequences have properties as follows: the value of the sum of periodic autocorrelation functions is zero at all shifts, except for zero shift, and the value of the sum of periodic crosscorrelation functions is zero at all shifts. If we use these properties for an approximately synchronized CDMA system, there is no cochannel interference nor influence of multipath. In this paper, in order to realize an M-ary system with periodic complete complementary sequences, we research the properties of the sum of the periodic auto/crosscorrelation functions of these sequences. As a result we can divide these sequences into four groups.
Keywords :
code division multiple access; functions; sequences; 4-phase orthogonal sequences; M-ary system; approximately synchronized CDMA system; periodic autocorrelation functions; periodic complete complementary sequences; periodic crosscorrelation functions; Autocorrelation; Frequency synchronization; Interchannel interference; Mobile communication; Multiaccess communication; Signal design; Spread spectrum communication;
Conference_Titel :
EUROCON'2001, Trends in Communications, International Conference on.
Conference_Location :
Bratislava, Slovakia
Print_ISBN :
0-7803-6490-2
DOI :
10.1109/EURCON.2001.937793
