Proceedings ArticleDOI
Performance of optical direct-detection CDMA systems using prime sequence codes
K. Sato,Tomoaki Ohtsuki,H. Uehara,Iwao Sasase +3 more
- Vol. 3, pp 1312-1316
TLDR
In this paper, the performance of optical synchronous code-division multiple access (CDMA) with on-off keying (OOK) signaling and CDMA with M-ary pulse position modulation (PPM)/CDMA systems using prime sequence codes as signature codes is analyzed under the assumption of Poisson shot noise model for the photodetector.Abstract:
The performance of optical synchronous code-division multiple-access (CDMA) with on-off keying (OOK) signaling (OOK/CDMA) and CDMA with M-ary pulse position modulation (PPM) signaling (PPM/CDMA) systems using prime sequence codes as signature codes is analyzed under the assumption of Poisson shot noise model for the photodetector. The bit error probability of OOK/CDMA is evaluated, and the upper bound on the bit error probability of PPM/CDMA is derived. Further, the performance is compared for some values of the average signal count per second, the length of prime sequences, and the number of simultaneous users under the constraint on throughput. It is found that PPM/CDMA performs better than OOK/CDMA by the pulse position multiplicity. It is also found that as the number of slots per frame of PPM increases, the bit error probability performance is improved. Moreover, it is found that CDMA with longer prime sequence codes has better performance. Therefore, we show that in order to achieve the low bit error probability and many simultaneous users, we should employ PPM/CDMA with larger number of slots and longer prime sequence codes.read more
Citations
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Journal ArticleDOI
Direct-detection optical synchronous CDMA systems with double optical hard-limiters using modified prime sequence codes
TL;DR: The results show that using the single optical hard-limiter slightly degrades the performance of the optical CDMA systems under the assumption of Poisson shot noise model for the receiver photodetector where the noise due to the detector dark currents exists.
Journal ArticleDOI
A synchronous fiber-optic CDMA system using adaptive optical hardlimiter
Che-Li Lin,Jingshown Wu +1 more
Abstract: In this paper, we propose a new synchronous fiber-optic code-division multiple-access (CDMA) system using adaptive optical hardlimiter and modified prime sequence code. At the receiver, the energy in one bit duration is estimated and used to adjust the threshold value of the adaptive optical hardlimiter which is placed after the optical correlator. The bit error probability of the system is analyzed with the consideration of thermal noise, shot noise, and dark current noise of the photodetector. The results show that this system can support a larger number of simultaneous users than other systems also using modified prime sequence code under the same bit error probability constraint.
Journal ArticleDOI
Channel interference cancellation using electrooptic switch and optical hardlimiters for direct-detection optical CDMA systems
TL;DR: In this article, a channel interference cancellation technique using an electrooptic (EO) switch and optical hardlimiters for direct-detection optical code-division multiple access (CDMA) systems is proposed.
Journal ArticleDOI
Channel interference reduction using random Manchester codes for both synchronous and asynchronous fiber-optic CDMA systems
Che-Li Lin,Jingshown Wu +1 more
TL;DR: The results show that the proposed systems can support a larger number of simultaneous users than other systems with similar system complexity under the same bit-error probability constraint.
Journal ArticleDOI
Direct-detection optical CDMA receiver with interference estimation and double optical hardlimiters
K. Wakafuji,Tomoaki Ohtsuki +1 more
TL;DR: In this article, the authors proposed a new channel interference cancellation technique using interference estimation and double optical hard limiters (DHLs) for direct-detection optical code-division multiple access systems.
References
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Journal ArticleDOI
Code division multiple-access techniques in optical fiber networks. I. Fundamental principles
TL;DR: An examination is made of fiber-optic code-division multiple-access (FO-CDMA), a technique in which low information data rates are mapped into very-high-rate address codes (signature sequences) for the purpose of achieving random, asynchronous communications free of network control, among many users.
Journal ArticleDOI
Code division multiple-access techniques in optical fiber networks. II. Systems performance analysis
J.A. Salehi,C.A. Brackett +1 more
TL;DR: In Part I a technique based on optical orthogonal codes was presented to establish a fiber-optic code-division multiple-access (FO-CDMA) communications system and it was shown that using an optical hard-limiter would, in general, improve system performance.
Proceedings ArticleDOI
Optical-fiber delay line signal processing
Newton Steven A,K. P. Jackson,Behzad Moslehi,Moshe Tur,C. C. Cutler,Joseph W. Goodman,Herbert J. Shaw +6 more
TL;DR: In this paper, a general overview of the elementary forms of fiber circuitry that are useful for signal processing as well as the complex filters and systems that they can be used to construct is provided.
Journal ArticleDOI
Performance comparison of asynchronous and synchronous code-division multiple-access techniques for fiber-optic local area networks
TL;DR: It is shown that the large bandwidth expansion required by spread-spectrum techniques, such as CDMA, can be accommodated by using a fiber-optic channel for transmission and incoherent optical signal processing for code generation and correlation.
Book
Optical fiber delay line signal processing
K. P. Jackson,S.A. Newton,B. Moslehi,Moshe Tur,C. C. Cutler,Joseph W. Goodman,Herbert J. Shaw +6 more
TL;DR: In this paper, the fundamental properties of single-mode fiber delay lines and experimental results that demonstrate the feasibility of fiber delay-line devices for broad-band signal processing applications are presented.
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