Andrew M. Weiner, Editor-in-Chief
Lingbin Li, Xiaolin Zhou, Rong Zhang, Dingchen Zhang, and Lajos Hanzo
Lingbin Li,1 Xiaolin Zhou,1,* Rong Zhang,2 Dingchen Zhang,1 and Lajos Hanzo2,3
1Department of Communications Science and Engineering, Fudan University, Shanghai, 200433,
2Communications, Signal Processing and Control, School of ECS, University of Southampton, SO17 1BJ,
*Corresponding author: firstname.lastname@example.org
In this paper, an iterative parallel interference cancellation (Iter-PIC) technique is developed for optical code-division multiple-access (OCDMA) systems relying on shot-noise limited Poisson photon-counting reception. The novel semi-analytical tool of extrinsic information transfer (EXIT) charts is used for analysing both the bit error rate (BER) performance as well as the channel capacity of these systems and the results are verified by Monte Carlo simulations. The proposed Iter-PIC OCDMA system is capable of achieving two orders of magnitude BER improvements and a 0.1 nats of capacity improvement over the conventional chip-level OCDMA systems at a coding rate of 1/10.
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Model of the Iter-PIC OCDMA system based on Poisson photon-counting reception and iterative detection.
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Extrinsic information transfer trajectories of soft in/soft out decoder for repetition codes, K = 4 users, ns = 60, nb = 39, coding rates of Rc = 1/4, 1/8, 1/16.
The relation between the output mutual information of ESE and the average signal-photon count in a single-user system without iterations, nb = 39.
BER performance for the single-user, non-iterative system, with nb = 39.
BER performance obtained by simulation (color markers) and EXIT charts analysis (black solid lines) with Ninfo = 2048, Rc = 1/8 and nb = 39, different number of iterations and users. The single-user performance (black dashed lines) is also plotted for reference.
Capacity in nats per signal photon versus the average number of photons per bit for Poisson based Iter-PIC OCDMA systems, Rc = 1/10 and nb = 39, K = 2, 4, 6.
BER performance of Iter-PIC OCDMA systems with It = 50 iterations and conventional chip-level OCDMA systems, for K = 4 users, nb = 39.
Capacities of the Iter-PIC OCDMA systems associated with It = 50 iterations and of conventional chip-level OCDMA systems, for K = 4 users, nb = 39.
Table 1 OOK based Parallel Iterative Detection Algorithm
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