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2D-DPSK for quasi-diffuse pixelated wireless optical channels

A low complexity two-dimensional differential phase shift keying scheme is proposed to alleviate the effect of the phase offsets due to corner-detection errors and low-pass spatial distortion for quasi-diffuse pixelated wireless optical channels. Simulation results show that performance degradation of the proposed scheme is less than 3dB from the traditional spatial discrete multitone modulation (SDMT) with perfect equalization. Compared with traditional SDMT with ZF equalization, complexity and resource consumptions are reduced without performance loss. Furthermore, the proposed scheme is more robust to corner-detection errors than traditional SDMT.