Abstract
Optical spatial modulation (OSM) is a multiple-input–multiple-output technique wherein the overall information is transferred through spatial and signal domains simultaneously. A problem in OSM is the necessity for channel state information at receiver (CSIR) that is obtained by complex channel estimation procedure. Apart from this, a small error in CSIR can cause a significant loss in the error performance of the OSM scheme. In this paper, in order to avoid the requirement of CSIR, a new scheme named as differential OSM (DOSM) is proposed; the average symbol error rate for the DOSM scheme with pulse-amplitude modulation is assessed under negative exponential and gamma–gamma channel models. A special and simplified version of DOSM, called as differential optical space shift keying is also discussed. It is noticed from the analysis that bypassing the requirement of CSIR leads to a small degradation in the error performance of DOSM scheme as compared to its traditional counterpart scheme with perfect CSIR. On the other hand, the proposed scheme outperforms OSM scheme with imperfect CSIR. Further investigations thoroughly examine the interplay between the error performance and spectral efficiency of the proposed scheme.
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