Abstract
A novel optical precoding scheme based on singular value decomposition (SVD) is proposed to solve the problem that strong channel correlation causes low spatial multiplexing gain in indoor visible light MIMO communication. This scheme first ensures a nonnegative signal after precoding through mapping the transmit bits into a specific symbol constellation. Then it eliminates the inter-channel interference by decomposing the MIMO channel through SVD. Finally, it reduces the BER by optimally allocating power among the sub-channels with the object to make the condition of each sub-channel equal. The simulation results show that SVD-based optical precoding scheme can significantly reduce the BER compared to ZF algorithm. And with the enhancement of channel correlation, the BER performance remains in a relatively low level, so it can obtain high spatial multiplexing gain under the strong correlation channel.
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