Abstract
An analog joint source channel coding (JSCC) system is developed for wireless optical communications.
Source symbols are mapped directly onto channel symbols using space filling curves and then a non-linear stretching
function is used to reduce distortion. Different from digital systems, the proposed scheme does not require long block
lengths to achieve good performance reducing the complexity of the decoder significantly. This paper focuses on
intensity-modulated direct-detection (IM/DD) optical wireless systems. First, a theoretical analysis of the IM/DD
wireless optical channel is presented and the prototype communication system designed to transmit data using analog
JSCC is introduced. The nonlinearities of the real channel are studied and characterized. A novel technique to
mitigate the channel nonlinearities is presented. The performance of the real system follows the simulations and
closely approximates the theoretical limits. The proposed system is then used for image transmission by first taking
samples of a set of images using compressive sensing and then encoding the measurements using analog JSCC. Both
simulation and experimental results are shown.
© 2014 IEEE
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