A New Prime Code for Synchronous Optical Code Division Multiple-Access Networks

Abstract

A new spreading code based on a prime code for synchronous optical code-division multiple-access networks that can be used in monitoring applications has been proposed. The new code is referred to as “extended grouped new modified prime code.” This new code has the ability to support more terminal devices than other prime codes. In addition, it patches subsequences with “0s” leading to lower power consumption. The proposed code has an improved cross-correlation resulting in enhanced BER performance. The code construction and parameters are provided. The operating performance, using incoherent on-off keying modulation and incoherent pulse position modulation systems, has been analyzed. The performance of the code was compared with other prime codes. The results demonstrate an improved performance, and a BER floor of 10−9 was achieved.

Comparative analysis of two address codes in a fiber-optic SA OCDMA system with FWM

“…The detail code structure of MQCC and MPC are given in [13,15] and the table I shows the brief structure of their properties.…”

“…However, certain publications, such as MQC code with FWM only [8] and MQC in both FWM and dispersion [12] have been studied. We have examined two codes from prime coding families, namely modified prime code (MPC) [13] and modified quadratic congruence code [7][8] [12], with the aim of figuring out the suitable sequence applicable in the SA OCDMA system. These codes have characteristics that help to effectively reduce the MUI and PIIN, improving system performance at large cardinality.…”

Performance Comparison of Different Modulation Formats for a 40 Gbps Hybrid Optical CDMA/DWDM System against ISI and FWM

“…where b m k (t) is the data of the mth user in the kth DWDM channel. For optical CDMA user's signatures, several address codes can be used, including m sequence, double padded-modified prime code (DPMPC), modified quadratic congruence (MQC), extended grouped new modified prime code (EG-nMPC) and multi-diagonal (MD) code [29,30]. Among all these codes, MD offers the best performance when MAI is considered due to the zero cross-correlation property of MD, where the length of the MD sequences is F = M × w, [31].…”