Optical OOK-CDMA and PPM-CDMA systems with turbo product codes

Argon, C.; McLaughlin, S.W.

doi:10.1109/jlt.2002.802224

Cited by 26 publications

(10 citation statements)

References 22 publications

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“…The turbo decoding procedure is based on the CHASE 2 algorithm [9] and [10] which is applied to optical PPM-CDMA channel and the additive white Gaussian noise (AWGN) model, respectively. In this section, the decoding algorithm for the optical satellite channel which is affected by the atmospheric effects is introduced.…”

Section: B Decoding Algorithmmentioning

confidence: 99%

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Performance Evaluation of Turbo Product Codes over the PPM-based Satellite Optical Channel

Liao

Zhang

Tan

et al. 2012

2012 International Conference on Computer Science and Electronics Engineering

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Atmospheric turbulence produces fluctuations in the irradiance of the transmitted optical beam, which is known as atmospheric scintillation, severely degrading the link performance. Turbo product codes (TPC) has attracted much attention for its high coding rate and strong abilities of defeating long burst errors, which is a good choice for the highly correlated optical channel. In this paper, a scheme combining turbo product codes (TPC) and pulse-position modulation (PPM) has been analyzed for the temporally correlated satellite-to-ground optical channel with an avalanche photodiode (APD) receiver and Gaussian thermal noise. The results indicate that TPC is capable of defeating long burst errors and it can offer enough temporally diversity for the free-space optical communication (FSOC) system.

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Section: B Decoding Algorithmmentioning

confidence: 99%

“…It is shown in [9][10] that the minimum distance of a product codes is the product of minimum distances of component codes. It is straightforwardly to show that the product code is able to correct the burst error of length b=max(n 1 b 2 ,n 2 b 1 ), where b i is the burst error capability of component code i = 1, 2.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Turbo Product Codes over the PPM-based Satellite Optical Channel

Liao

Zhang

Tan

et al. 2012

2012 International Conference on Computer Science and Electronics Engineering

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“…A fiber-OCDMA system represents one of the most promising multiple access techniques that respond positively to these needs. Communication systems using CDMA also have the following advantages [1]: 1) security against unauthorized users, 2) protection against jamming, 3) flexibility of adding users, and 4) asynchronous access capability. In an OCDMA system, an optical orthogonal code (OOC) sequence is assigned to each user.…”

Section: Introductionmentioning

confidence: 99%

“…SYSTEM DESCRIPTION Figure 1 represents a general configuration for a fiber -OCDMA system, with real time passive encoders/decoders employed in a star topology network. In this network, we assume that there are N active users corresponding to a star coupler with dimensions, 1-4244-0272-7/06/$20.00 ©2006 IEEE I NsxNs (1) where NS is the maximum number of users allowed on the network.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Optical Code Division Multiple Access Passive Networks for Different Encoder Delay Elements

Morsy

Hassan

Morshed

et al. 2006

2006 International Conference on Computer Engineering and Systems

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One of the most important core technologies in the development of optical code division multiple access (OCDMA) local area networks is the optical encoder/decoder embodiment technology which codes information to fixed patterns at the transmitting side and decodes information at the receiving side. The selection of optimized encoding method for network composition is necessary to accommodate a maximum number of subscribers that have simultaneous access over the local area network and the bandwidth of subscriber services available on it. When composing this encoder/decoder optically, passive elements are exclusively used, if possible, so as to make the composition method simple and economical.In this paper we present an analysis of OCDMA passive communication networks focusing on the modeling of optical encoder/decoder blocks for different types of delay elements. The main objective of the paper is to study the performance of these networks including the effect of the passive encoder/decoder parameters such as splitter and optical delay line losses. Different types of delay lines are proposed including optical fibers and fiber Bragg gratings (FBG) as delay elements for the selection of the optical delay line which achieves a better performance. A statistical model of an OCDMA network has been developed and used for this study, including the effect of different passive encoder/decoder parameters, multiple access interference and noise.

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“…This receiver does not require the optical hardlimiters or the correlator in its implementation; hence, it is much more practical than the correlation receiver with hardlimiters. The other studies on interferencecancellation techniques are inspired by radio frequency (RF) communications, such as multiuser detection [1], parallel interference cancellation (PIC) [4], [10]- [14], serial interference cancellation [15], or turbo codes [16]. These techniques are more complex than the HL techniques, but they are more efficient.…”

Section: Introductionmentioning

confidence: 99%

A Novel Successive Interference Cancellation Scheme in OCDMA System

Eltaif

Shalaby

Shaari

2006

2006 IEEE International Conference on Semiconductor Electronics

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In DC/CDMA systems, overcoming near/far effects is imperative for satisfactory performance. One way to combat the near/far effect is to use stringent power control. Another approach is multiuser detection (MUD). In addition to mitigating the near/far effect, MUD has more fundamental potential of raising capacity by canceling MAI. In this paper we going to present MUD scheme's known as successive interference cancellation (SIC). Where DS-OCDMA receiver was studied based on the SIC technique without hard limiter. Also we mention to use this technique with hardlimiter placed before the nondesired users.

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Optical OOK-CDMA and PPM-CDMA systems with turbo product codes

Cited by 26 publications

References 22 publications

Performance Evaluation of Turbo Product Codes over the PPM-based Satellite Optical Channel

Performance Evaluation of Turbo Product Codes over the PPM-based Satellite Optical Channel

Analysis of Optical Code Division Multiple Access Passive Networks for Different Encoder Delay Elements

A Novel Successive Interference Cancellation Scheme in OCDMA System

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