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The next generation communication systems usually referred to as fourth generation (4G) systems will not be based on a single system but it will encompass a number of different complementary access technologies. The integration of power line communication with that of visible light communication is being considered as one such system. The existing integrated system degrades in its performance in the presence of power line noises and additive white Gaussian noise. In this paper a modified integrated system that utilizes the advantage of turbo codes is proposed. Parallel concatenated convolutional codes which are a class of turbo codes have been considered in this paper. The concatenated codes are chosen since they are effective in correcting the burst errors which are more predominant in power line channel. Also in the modified integrated system the effect of multipath in power line channel has been considered. The simulations are done with four paths and their amplitude and phase details were plotted. To further enhance the performance of the system a modified bit error minimization algorithm which is based on the number of iterations has been proposed. The simulation results show that the modified integrated system based on turbo code provides a coding gain of about 6 dB than the existing integrated system.