As a communication system for indoor wireless local area networks, a non-directed diffuse optical communication system has taking a great attention. In this paper, as a non-directed diffuse optical communication system, the multi beam non-directed diffuse optical communication system, which has the non-directed multi beam transmitter, is proposed, and the performance of proposed system is investigated. At first, we propose a radiant emittance model for multi beam transmitter, and then, using this model, the performance of proposed system is evaluated. Moreover, we evaluate the effect of delay spread to the performance improvement is achieved by reducing the delay spread.
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