Abstract
In this work, a practical efficiency evaluation method for InGaN-based LEDs is deduced, in which the internal quantum efficiency and output light power–injection current (L–I) curves can be reconstructed by the injected current I0 corresponding to the peak quantum efficiency, a given injected current I1 and the corresponding light output power ratio r. There is good agreement between the calculated result using the proposed method and measured L–I result using the integral sphere system. On this basis, the pre-distortion and post-mitigation is realized for the DC-biased orthogonal frequency division multiplexing (DCO-OFDM) system. It is demonstrated that the bit error rate (BER) performance of the visible light communication (VLC) system with pre-distortion is much better than the original system even if the estimated I0 and r values are not very accurate. Furthermore, using adaptive post-mitigation based on the proposed LED evaluation method, the performance of VLC system can also be improved obviously.
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