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We design a receiver assembling several photomultipliers (PMTs) as an arrayto increase the field of view (FOV) of the receiver and adapt to multiusersituation over None-line-of-sight (NLOS) ultraviolet (UV) channels. Channelestimation and signal detection have been investigated according to the spacedivision characteristics of the structure. Firstly, we adopt the balancedstructure on the pilot matrix, analyze the channel estimation mean square error(MSE), and optimize the structure parameters. Then, with the estimatedparameters, an analytical threshold detection rule is proposed as a preliminarywork of multiuser detection. The detection rule can be optimized by analyzingthe separability of two users based on the Gaussian approximation of Poissonweighted sum. To assess the effect of imperfect estimation, the sensitivityanalysis of channel estimation error on two-user signal detection is performed.Moreover, we propose a successive elimination method for on-off keying (OOK)modulated multiuser symbol detection based on the previous threshold detectionrule. A closed-form upper bound on the detection error rate is calculated,which turns out to be a good approximation of that of multiusermaximum-likelihood (ML) detection. The proposed successive elimination methodis twenty times faster than the ML detection with negligible detection errorrate degradation.

Channel Estimation and Signal Detection for NLOS Ultraviolet Scattering Communication with Space Division Multiple Access