Analytical comparison of various fiber-optic CDMA receiver structures

Zahedi, S.; Salehi, Jawad A.

doi:10.1109/50.908700

Cited by 108 publications

(42 citation statements)

References 10 publications

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“…In this work, we develop the structure of a conventional correlation receiver (CCR: Conventional Correlation Receiver) [5]. Figure 2 shows the principle of detection and estimation of the transmitted data, and which comprises 3 functions:…”

Section: Reception System Of Ds-ocdmamentioning

confidence: 99%

Comparative Study of Optical Unipolar Codes for Incoherent DS-OCDMA system

Chikh-Bled¹,

Boudaoud²,

Chetouane³

2013

IJHIT

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Section: Reception System Of Ds-ocdmamentioning

confidence: 99%

Comparative Study of Optical Unipolar Codes for Incoherent DS-OCDMA system

Chikh-Bled¹,

Boudaoud²,

Chetouane³

2013

IJHIT

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“…The cardinality of this code is (2) which is considerably higher than OOC with . For typical values of and [4], we can have, at most, 27 codewords with and 7924 codewords with . Despite the complexity in analyzing the performance of the system in [3], it was shown that the degradation in performance for OOC codes is not severe, and, in fact, under certain conditions such as for fixed number of users and code length , one can increase the weight of the OOC codes such that it will surpass in performance when compared with OOC optical CDMA systems.…”

mentioning

confidence: 99%

“…In [5], a general upper bound on the number of OOC codes was obtained, and it was shown to be (3) To generalize our scheme, we will consider , which implies that we consider all possible codes of length and weight (except the corresponding cyclic shifts) regardless 0090-6778/02$17.00 © 2002 IEEE of their mutual cross-correlation value. For sufficiently large values of and , the number of generalized OOC codes is approximately equal to (4) which could be extremely large for typical values of and . However, it remains to be seen that the performance of such optical CDMA systems is not severely degraded.…”

mentioning

confidence: 99%

Frame time-hopping fiber-optic code-division multiple access using generalized optical orthogonal codes

Forouzan

Salehi

Nasiri-Kenari

2002

IEEE Trans. Commun.

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Abstract-In this paper, a new spreading technique for intensity modulation direct detection fiber-optic code-division multiple-access (FO-CDMA) communication systems is proposed. This new spreading technique is based on generalized optical orthogonal codes (OOC) with large cardinality and minimal degradation in performance when compared with a more optimum system, namely, an optical CDMA system using OOC with autocorrelation and cross-correlation value bounded by one, i.e., OOC ( = 1).To obtain the performance of such systems, we use a recently introduced communication scheme, namely, frame time-hopping (FTH)-CDMA with random coding. It is discussed that systems with generalized OOC patterns and random time-hopping coding are close in structure and performance. Furthermore, the performance of such systems is near the performance of optical CDMA with optimum but low cardinality OOC ( = 1), which further renders the practicality of the proposed technique with very large cardinality. Two new receiver structures for FO-CDMA, namely, chip-level detector with optimum comparator threshold and correlation receiver with an electrical hard limiter, are also proposed. Performance analysis for a binary pulse position FTH-FO-CDMA network is considered for the correlation receiver, chip-level detector, correlation receiver with an optical hard limiter, optimum receiver, and the two newly proposed receiver structures. The results also show that a chip-level detector with optimum comparator threshold is superior to a chip-level detector for received low signal powers, and predict that the performance of the correlation receiver with an electrical hard limiter is superior to all other considered receiver structures, e.g., requiring one third of transmission power to achieve a desired bit error rate when compared with other receiver structures. Index Terms-Chip-level detector, frame time-hopping (FTH), optical code-division multiple access (CDMA), optical hard limiter, optical orthogonal codes (OOC).

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“…This system utilizes an active correlation receiver where the integration time after the photodetector is in T seconds. Thus, this receiver requires a lower speed electronic design compared with passive correlation receivers [41].…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a dynamic code division multiple access communication system based on tunable optical filter

Hamarsheh

Shalaby²,

Abdullah

2005

J. Lightwave Technol.

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Abstract-A dynamic optical code division multiple access (DOCDMA) communication system is proposed for high-bandwidth communication systems. An implementation of the system is proposed based on a fast tunable optical filter (TOF) in each encoder and decoder. This technique actively modulates the central wavelength of a TOF according to a functional code at the transmitter during the bit period before the transmission of the data. The system is modeled and analyzed taking into account multiple access interference (MAI), thermal noise, and phase-induced intensity noise (PIIN). The performance of this system is compared to that of a spectral amplitude coding system that uses either a Hadamard code or a modified quadratic congruence (MQC) code. The results show that the proposed DOCDMA system reduces the PIIN effect on the performance of the system and improves the bit error rate (BER) performance at a large number of users. Furthermore, it is found that when the effective power is large enough, the MAI becomes the main factor that limits system performance, whereas when the effective power is relatively low, both thermal noise and PIIN become the main limiting factors with thermal noise having the main influence.Index Terms-Multiple access interference, optical code division multiple access (CDMA), optical fiber communication systems, spectral amplitude coding.

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Analytical comparison of various fiber-optic CDMA receiver structures

Cited by 108 publications

References 10 publications

Comparative Study of Optical Unipolar Codes for Incoherent DS-OCDMA system

Comparative Study of Optical Unipolar Codes for Incoherent DS-OCDMA system

Frame time-hopping fiber-optic code-division multiple access using generalized optical orthogonal codes

Design and analysis of a dynamic code division multiple access communication system based on tunable optical filter

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