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|Title:||Dynamic decision threshold and adaptive coherent detection in FSO communication system|
|Keywords:||adaptive coherent detection|
dynamic decision threshold
free-space optical (FSO)
|Source:||Wang, Z.,Zhong, W.-D.,Yu, C. (2011). Dynamic decision threshold and adaptive coherent detection in FSO communication system. ICICS 2011 - 8th International Conference on Information, Communications and Signal Processing : -. ScholarBank@NUS Repository. https://doi.org/10.1109/ICICS.2011.6174253|
|Abstract:||In this paper, we first compare the bit error rate (BER) performance of OOK FSO transmission systems under noncoherent and coherent detections. With coherent detection, BER of 10 9 can be achieved under different atmospheric turbulence scenarios from weak to strong. In addition, we propose a dynamic decision threshold scheme to further improve the performance of coherent detection, where the decision threshold is varied in every sub-millisecond time slot. It is found that when the power of local oscillator is 8dBm, dynamic decision threshold scheme provides a 4.0dB power reduction in achieving BER of 10 9 towards traditional fixed decision threshold scheme. In addition, we propose an adaptive coherent detection in FSO system, where a high power-local oscillator (LO) is used to mitigate the deep fading while a low power-LO is to mitigate the rest fading scenarios. Result shows that the outage probability is reduced completely and the average power is only 10% of the high power-LO © 2011 IEEE.|
|Source Title:||ICICS 2011 - 8th International Conference on Information, Communications and Signal Processing|
|Appears in Collections:||Staff Publications|
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