Performance analysis of line strip multispot diffusing system, fully diffuse, and hybrid optical wireless techniques in a real environment

Performance comparison and evaluations for indoor optical wireless systems in three different environments are carried out. Channel characteristics of infrared links have been evaluated under various conditions, including an empty room, a room with glass windows and a door, and a room that has very strong shadowing effects caused by mini cubical offices. The corresponding results have been analyzed and compared for conventional hybrid/diffuse systems (CDS/CHS) and line strip multibeam transmitter systems (LSMS) that use spot diffusing techniques. Eight directive lamps represented the ambient light noise and allowed further signal impairments to be taken into account. Under these conditions, our results indicate that LSMS can reduce pulse spread by a factor of 11 and 30 lower than the delay spread associated with CDS and CHS, respectively. Furthermore, LSMS links can increase the SNR by more than 50 dB and about 55 dB compared to the CDS and CHS, respectively.