PERFORMANCE ANALYSIS OF INDOOR OPTICAL WIRELESS CDMA SYSTEM USING OPTICAL ZERO CROSS CORRELATION CODE

In this paper, we present an indoor optical wireless model to evaluate the impact of direct and reflected lights on the bit error rate (BER) performance of an indoor optical wireless Code Division Multiple Access (CDMA) system. In this model, we divided each wall into small reflecting surfaces and took into account multiple surfaces. Based on this model, the optical received power with and without considering the reflected light were calculated. Moreover, the BER performance based on zero cross correlation code (ZCC) analysed. By using ZCC code, the BER gives better performance due to low effective power used at the photodetector .The results show good performance at the centre of the room compared to the edges. Therefore, the BER performance significantly depends on the position of the transmitter, size of the room and the active user number. So, these parameters have to be considered whenever an indoor optical wireless CDMA is used.