ZCZ Codes for ASK-CDMA System

Trial of free-space parallel transmission system based on optical ZCZ-CDMA system

“…The set is called an optical ZCZ code [7] if the periodic auto-and cross-correlation functions satisfy where w is the number of the nonzero elements in each sequence and z is a zero-correlation zone. The optical ZCZ codes are bounded by…”

“…We have proposed the optical ZCZ code with z = 1 and 4n−2, n is natural number, whose family size are M = N/(z +1)−2 and M = N/(z + 1) − 1, respectively [7]. In this paper, we describe about the optical ZCZ code with z = 1 used the manufactured system.…”

“…The optical ZCZ-CDMA system has been proposed as a method of suppressing the interference from adjacent light source of desire light source without complicating hardware, and it is clear that this system can suppress the interference by the theoretical analysis and indoor experiment [5], [6]. In this optical ZCZ-CDMA system, the optical ZCZ code is used as the spread code, and is a set of pairs of binary and biphase sequences with zero-correlation zone [7]. We have proposed the compact construction of code generators [8] and banks of matched filters (MFs) [9], [10] for this ZCZ-CDMA system.…”

Code Generator for Optical ZCZ Sequence with Zero-Correlation Zone 2^z

“…Multiple access interference (MAI) cancellation methods with the optical orthogonal code (OOC) or modified prime sequence code (MPSC) have been proposed in the optical code division multiple access (CDMA) system [4,5]. The optical CDMA system using the optical zero-correlation zone (ZCZ) sequence set can detect the desired sequence without the MAI of undesired sequences, even if the synchronization is not perfect between users [6]. The ambiguity of synchronization is dependent on the size of ZCZ.…”

“…N,i < N, then the set A z is called an optical ZCZ sequence set [6] with the ZCZ size Zcz = 2 z . The optical ZCZ sequence sets are bounded by M ≤ N/(Zcz + 1).…”