Performance analysis of modified prime-hop codes for OCDMA systems with multiuser detectors

Lin, Jen-Yung; Jhou, Jhih-Syue; Liu, Chia-Yu; Wen, Jyh‐Horng

doi:10.1016/j.yofte.2006.10.008

Cited by 4 publications

(5 citation statements)

References 19 publications

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“…For the same balanced photodetection scheme as well as suitable for synchronous networks, Fig. 8 compares the BER performance of the proposed modified TS/WGH embedded M-sequence code with that of conventional PHC, 17 MPHC, [26][27][28] and TS/GH embedded M-sequence code, 21 respectively. Furthermore, the Barker and Walsh-based bipolarbipolar code scheme presented in Refs.…”

Section: Group-by-group Assignment Of Code Wordsmentioning

confidence: 99%

“…Furthermore, an additional optical cross-connect (OXC) devices [22][23][24] is integrated with a code-word-changing algorithm (i.e., hereafter referred to as adaptive OXC device), which automatically triggers a change in the user code word in response to a suspected eavesdropping attack. In current study, compared to conventional TDM, WDM, 1-D spectral amplitude coding (SAC) -OCDMA 25 and various 2-D time-spreading/wavelength-hopping schemes, 17,21,[26][27][28] the scheme proposed in this study improves the synchronous networks' confidentiality by increasing the user cardinality and changing the user code word on a sufficiently frequent (timely) basis.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive modified time-spreading and wavelength-group-hopping embedded M-sequence code for improved confidentiality over synchronous networks

Huang

2011

Opt. Eng

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An adaptive modified two-dimensional time-spreading/ wavelength-group-hopping embedded M-sequence code (TS/WGH embedded M-sequence code) is proposed for enhancing the cardinality, confidentiality, and bit error rate (BER) of synchronous networks. The proposed arrayed-waveguide-grating (AWG)-based modified TS/WGH embedded M-sequence encoder/decoder (codecs) is constructed by using a fine AWG to generate an M-sequence code pattern and then using multiple-coarse AWGs to spread this pattern in the wavelength domain. The signals produced by the coarse AWGs are then spread in the time domain using optical delay lines. In addition, an algorithm based on an anticipative-warning-time mechanism and a degree of weighted load balance (DWLB) policy is proposed for changing the signature address code word of each user on a sufficiently frequent basis in order to thwart synchronous-network attacks by eavesdroppers. Overall, the simulation results show that, compared to conventional two-dimensional prime-hop code (PHC) and modified PHC and previous TS/group-hopping embedded M-sequence code, the proposed adaptive modified TS/WGH embedded M-sequence code proposed in this study yields an effective reduction in the multiple-access interference and BER while simultaneously improving the degree of confidentiality. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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Section: Group-by-group Assignment Of Code Wordsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adaptive modified time-spreading and wavelength-group-hopping embedded M-sequence code for improved confidentiality over synchronous networks

Huang

2011

Opt. Eng

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“…By reducing code weights, the probability of one data pulse being hit by others with same wavelength decreases. One modification is given in [8], which is removing pulses within odd-numbered frames of a symmetric PHC, hence the code weight as well as the threshold are changed to w m =(w+1)/2.…”

Section: The Modified Prime-hop Codementioning

confidence: 99%

“…Therefore, the performance of spectrally sliced FFH-OCDMA schemes depends on not only the code construction but also noise limitations at the physical layer. Based on the new coding scheme that presented recently [8], this paper …”

Section: Introductionmentioning

confidence: 99%

Transmission Performance of Spectrum-Sliced Incoherent 2-D FFH-OCDMA Systems Using Modified Prime-hop Codes

Sun

Leeson

2009

2009 WRI International Conference on Communications and Mobile Computing

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Two-dimensional optical CDMA has been proved to be a promising access technique providing many distinctive merits.A system using fiber Bragg gratings to spectrally slice the incoherent light from a low cost light source is proposed. The optical beat noise in such an incoherent system is studied as the dominant noise source. The sliced wavelengths are thereafter encoded according a predetermined pattern. A modified prime hop code (MPHC) scheme is employed to lower the power loss and reduce the BER degradation caused by the beat noise. Comparison between MPHC and prime hop codes (PHCs) regarding the beat noise indicates that MPHC is very suitable for the proposed incoherent system

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“…The drawbacks of using an incoherent source are that the optical systems suffer from beat noise as well as from significant dispersion [11]. Previous work [12,13] on PHCs focuses primarily on the reduction of MAI but largely ignoring the impact of the physical layer. The work in [14] has presents a possibility of reducing the beat noise impact in SS FFH-OCDMA by modifying PHCs.…”

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confidence: 99%

Higher-order dispersion mitigation for spectrum-sliced FFH-OCDMA using adaptive prime-hop codes

Sun

Leeson

2010

Photon Netw Commun

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The fast frequency hopping optical CDMA with prime-hop codes (PHCs) provides great flexibility and increases spectral efficiency in comparison with direct sequence methods. Applying the spectrum-sliced incoherent source will further reduce the system cost. However, the dispersion in such an incoherent system becomes a limiting factor to the bit error rate. A novel adaptive PHC scheme to such systems is proposed in this article. The main impact of the scheme is to reduce the power loss and the bit error rate (BER) degradation due to higher-order dispersion. The impact of inherit beat noise in spectrum slicing systems is also alleviated. Performance comparisons between the adaptive PHC and original PHC schemes indicate that the former is more suitable for use in the considered incoherent system, accommodating up to 17% more users for a given BER. The proposed adaptive method can be universally applied to mitigate dispersion effects in the similar 2D OCDMA systems.

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Performance analysis of modified prime-hop codes for OCDMA systems with multiuser detectors

Cited by 4 publications

References 19 publications

Adaptive modified time-spreading and wavelength-group-hopping embedded M-sequence code for improved confidentiality over synchronous networks

Adaptive modified time-spreading and wavelength-group-hopping embedded M-sequence code for improved confidentiality over synchronous networks

Transmission Performance of Spectrum-Sliced Incoherent 2-D FFH-OCDMA Systems Using Modified Prime-hop Codes

Higher-order dispersion mitigation for spectrum-sliced FFH-OCDMA using adaptive prime-hop codes

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