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Article Dans Une Revue Journal of Lightwave Technology Année : 2013

On Bit-loading for Discrete Multi-tone Transmission over Short Range POF Systems

Résumé

A novel bit-loading approach is proposed for the discrete multi-tone (DMT) transmission over short range polymer optical fiber (POF) systems. First of all, from the extract signal-to-noise ratio (SNR) table of quadrature amplitude modulation (QAM) for different desired bit error rates (BER), a new linear approximation (LA) expression is introduced to implement bit-loading for DMT systems. Then, based on water-filling concept, the performance bounds and optimal power allocations for the classical and the proposed bit-loading algorithms in Gaussian low-pass channel models are derived. Consequently, introducing the measured channel parameters of step-index (SI)-POF channels with different transmission distances, the theoretical performance bounds are computed and the practical transmission rates are simulated. Simulation results show that the proposed LA expression based bit-loading achieves higher transmission rate than classical modulation gap based bit-loading. Both algorithms use sub-optimal Chow algorithm with constant power allocation and iterative process. Finally, real DMT transmissions over SI-POFs are implemented in order to verify the proposed method. The LA expression based bit-loading outperforms the modulation gap based bit-loading in DMT transmission systems over different transmission distances. Moreover, experimental results show that the longer fiber length, the higher performance gain with LA expression based bit-loading. In the comparisons, for a 50 m SI-POF transmission, the transmission rate in DMT system with LA expression based bit-loading is improved by 5 % with the same experimental setups for a given BER at 1e-3 and by 10% for a 100 m length.
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Dates et versions

hal-00913435 , version 1 (03-12-2013)

Identifiants

  • HAL Id : hal-00913435 , version 1

Citer

Linning Peng, Maryline Hélard, Sylvain Haese. On Bit-loading for Discrete Multi-tone Transmission over Short Range POF Systems. Journal of Lightwave Technology, 2013, 31 (24), pp.4155-4165. ⟨hal-00913435⟩
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