&amp;#x00B1;&amp;#x03C0;/2-Phase-shift spectral phase encoding for security improvement in the optical code based system

Zahid, Ali Z. Ghazi; Dai, Bo; Chen, Yao; Wang, Dong; Tao, Chun-xian; Zhang, Dawei; Wang, Xu

doi:10.1109/iccchina.2014.7008258

Cited by 2 publications

(2 citation statements)

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“…It is the rewritable optic disc for digital video recording with high numerical aperture and a blue laser. Ali Zahid, Bo Dai, Yao Chen, and Dong Wang [7] proposes a novel spectral phase encoding for optical communication by using a ±Π/2 phase shift in encoding and decoding. The system offers high security at the time of code extraction from the encoded signals.…”

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Efficient Channel Coding Scheme for Optical Memory: An Overview

Jose¹

2019

IJRASET

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The nowadays huge amount of data generated each year. The main challenge behind current information technology is not able to store efficiently. In this paper analyzed the recent development in optical storage techniques. The essential requirement for any memory system is data reliability. In optical memories data may be corrupted while recorded, retained or readout from the optical memory. For example, the readout system and material noise, optical effects such as reflection, diffusion, and pixel crosstalk due to additive noise in Gaussian amplitude. Mechanical noise sources are also present; such as jitter due to positioning the readout mechanism or optical media. The data reliability is achieved by using error correcting codes and media-specific data modulation. The research is focused to design a hardware for optical memory. The hardware is designed with LDPC algorithm. The high potential of LDPC codes, binary and nonbinary LDPC decoding algorithms for the optical system is implemented in FPGA using VHDL language. LDPC codes are the most powerful error correcting codes. And this encoding scheme is compared with another encoding scheme and get the most hardware efficient encoding scheme. Keywords-Low-Density Parity Check (LDPC) encoder, decoder, VHDL language, Field Programmable Gate Array (FPGA).I. INTRODUCTION There is technological evolution in the recording and storage of information. The main revolution in this field is digitization, which allows music, sounds, pictures, words, and movies to be stored in a binary form. The invention of optical compact discs (CDs), where a laser beam was used to store the binary data, it was one of the major milestones in digital information technology. The magnetic storage devices and CDs have played a crucial role in the digital life of human beings. Economically digital information technology has played a great role. The estimation results show that the information generated by the major sectors is nearly doubled every year. The total amount of data generated globally will reach 35 ZB by 2020, According to a report prepared by International Data Corporation (IDC) in 2011, However, there is a growing gap between the amount of digital data being created and the available storage capacities. A large amount of data may corrupt while in transmission or reception. So, this information should be stored in a specific manner. The customer should be promised by the security of the data. In this paper considering with an encoding scheme that will promise the data integrity and storage capacity. Here encoding scheme is preferred that is Low-Density Parity-Check coding, which is a class of linear block codes and also an error correcting code. The LDPC codes have decreased the complexity of decoding. Section II discusses about different encoding/decoding methods. These encoding/decoding schemes are compared in section III. Section IV concluded with a conclusion and future work. II.ENCODING/DECODING METHODS Various encoding techniques have been developed in the field of optical memory...

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“…Reduce data redundancy, encoding efficiency up to 4% more than that of DVD Ref [5] Brillouin based memory, encoding in phase & amplitude Achieve bandwidth efficiency and capacity Ref [6] Combi code Coding complexity reduced Ref [7], [8], [9] Spectral phase encoding, DPSK optical code hopping scheme…”

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confidence: 99%