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We develop the novel ±π/2-phase-shifted SSFBG en/decoders (31-chip 640Gchip/s) and verify the improved security performance. We also demonstrate the mixed use of 0/π- and ±π/2-phase-shifted SSFBG en/decoders in the 4-user 10Gbps/user OCDMA system.
We experimentally demonstrate the security improvement using ±π/2-phase-shifted SSFBG encoder in time-spreading OCDMA. Compared with conventional 0/π-phase-shifted SSFBG encoder, ±π/2-phase-shifted SSFBG encoder conceals code pattern well in the encoded waveform. We also investigate the influence of input pulse and the experimental measurement matches the calculated result very well.
We experimentally demonstrate security vulnerability in the temporal phase coding single-user DPSK- and CSK-OCDMA systems with a DPSK demodulator. In the systems without proper decoding, error free BER performance and clear open eye diagrams indicate the eavesdropping possibility for both systems. We also discuss the principle of DPSK demodulation attack.
This paper presents the security enhancement for spectral amplitude coding optical CDMA. The eavesdropper probability of error-free code detection based on hybrid code system is investigated. Enhancement Double Weight (EDW) optical CDMA scheme and M-sequence codes are used as a hybrid code system. The eavesdropper performance is based on observing the authorized transmitted signal based on classical...
This paper presents security performance for incoherent unipolar and bipolar Optical CDMA Network Systems. The eavesdropper performance is investigated, by simulation, based on Modified Double Weight (MDW) Spectral Amplitude Optical CDMA. Our results show that using unipolar OCDMA code schemes based on MDW code system enhances the security with a low cost implementation in comparison to the bipolar...
In this paper, two different configurations to enhance the system confidentiality in a multi-user environment are presented. All-optical scrambling, based on optical code division multiple access (OCDMA) encoders, is used to prevent signal decryption from unauthorized users. Eye diagrams and BER measurements are also presented to describe the systems performance.
This paper presents the security performance of spectral amplitude code OCDMA systems. We examine factors affecting data security such as system capacity and its influences on the eavesdropper SNR. The eavesdropper probability of error-free code detection for Modified Double Weight (MDW) OCDMA scheme is investigated. The eavesdropper performance is based on observing the authorized transmitted signal...
Although, enhanced security is often mentioned as a noticeable benefit of spectrally phase encoded optical CDMA (SPE-OCDMA) systems, the quantity and degree of security enhancement is not considered deeply in the literature. One of the facts in determining the degree of security is to assess the resistance capability of the system against various jammers attacks. In this paper, we introduce and model...
Interleave Division Multiple Access (IDMA) is one of the competitors for next generation wireless systems. IDMA not only inherits all the advantages of CDMA but also has the capability to overcome its deficiencies. In this paper, security analysis of IDMA system has been carried out through NIST tests and it has been found that it is highly secure on its own, not requiring any additional security...
A novel optical layer solution to increase confidentiality in optical code division multiple access (OCDMA) transmission is proposed. We use two or more optical encoders/decoders to increase the degrees of freedom in the encoding process, increasing accordingly the decryption complexity. We demonstrate that we can achieve enhanced confidentiality, with respect to standard OCDMA system, evaluating...
Wireless sensor networks consist of a large number sensors spread across a given geographical area. Each sensor has its own communication capability as well as certain level of intelligence for signal processing and networking. As the sensor nodes are densely populated, communication range requirement for these nodes is smaller. After signal detection, a number of sensor nodes communicate over the...
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