Impact of spatial sampling frequency offset and motion blur on optical wireless systems using spatial OFDM

M. Rubaiyat H. Mondal
2016 EURASIP Journal on Wireless Communications and Networking  
Pixelated communication systems can convey high-speed data over optical wireless channels by using spatial orthogonal frequency division multiplexing (spatial OFDM) modulation. Two forms of spatial OFDM, spatial asymmetrically clipped optical OFDM (SACO-OFDM) and spatial dc-biased optical OFDM (SDCO-OFDM), have been considered in the literature of pixelated communication. This paper mathematically describes the SACO-OFDM signal and then proposes a power-efficient derivative of SACO-OFDM termed
more » ... s noise-cancelled spatial OFDM (NCS-OFDM). However, NCS-OFDM and other spatial OFDM systems can be impaired by spatial sampling frequency offset (SSFO) defined as the difference in the number of transmitted and received pixels and by coexisting defocus and motion blur forming an asymmetric point spread function (APSF). In this paper, for the first time, the effects of SSFO and APSF on a spatial OFDM based pixelated system are investigated. Simulation results show that both SSFO and APSF cause phase distortions and attenuation of the data-carrying spatialsubcarriers resulting in bit error rate (BER) degradation. Simulation results also indicate that in the presence of several channel impairments including SSFO and APSF, NCS-OFDM outperforms SACO-OFDM and SDCO-OFDM in terms of power efficiency.
doi:10.1186/s13638-016-0741-y fatcat:tmt2ay3a45gbhbj7ac6bib3ypy