Optical orthogonal code-division multiple-access system—Part II: Multibits/Sequence-period OOCDMA
Kwon, Hyuck M.
Kwon, Hyuck M.
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1994-08-31
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Article
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Keywords
Binary Sequences,Codes (symbols),Coding Errors,Correlation Theory,Data Communication Systems,Mathematical Models,Photodiodes,Probability,Signal Interference,Spurious Signal Noise,Bit Error Probability,Maximum Correlation Location,Optical Orthogonal Code Division Multiple Access Systems (oocdma),Sequence Period,Optical Communication
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Citation
H. M. Kwon, "Optical orthogonal code-division multiple-access system .II. Multibits/sequence-period OOCDMA," in IEEE Transactions on Communications, vol. 42, no. 8, pp. 2592-2599, Aug. 1994, doi: 10.1109/26.310619.
Abstract
In a recently proposed optical orthogonal code division multiple-access (OOCDMA) system, one bit of users data is transmitted per sequence-period, and a threshold is employed for the final bit decision. In this paper, a system that can transmit multibits per sequence-period is introduced, and avalanche photodiode (APD) noise, thermal noise, and interference, are included. This system, derived by exploiting orthogonal properties of the OOCDMA code sequence and using a maximum search (instead of a threshold) in the final decision, is log2 F times higher in throughput, where F is sequence-period. For example, four orders of magnitude are better in bit error probability at -56 dBW received laser power, with F = 1000 chips, 10 ‘marks’ in a sequence, and 10 users of 30 Mb/s data rate for one-bit/sequence-period and 270 Mb/s data rate for multibits/sequence-period system. Furthermore, an exact analysis is performed for the log2F bits/sequence-period system with a hard-limiter placed before the receiver, and its performance is compared to the performance without hard-limiter, for the chip-synchronous case. The improvement from using a hard-limiter is significant in the log2F bits/sequence-period OCCDMA system (while it is not in a ene-bit/sequence-period OOCDMA system in [7]). © 1994 IEEE. © 2015 Elsevier B.V., All rights reserved.
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This is an open access article under the CC BY license.
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Institute of Electrical and Electronics Engineers Inc.
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IEEE Transactions on Communications
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15580857
00906778
00906778