—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.
—Indoor visible light communication, optical
MIMO, precoding, SVD, power allocation.
Shuai-Fang Xiao is with the National Digital Switching System
Engineering & Technological Research Center, Zhengzhou 450002, China
Qing-Feng Liu, Kai-Zhi Huang, and Zhou Zhong are with the National
Digital Switching System Engineering & Technological Research Center,
Zhengzhou 450002, China.
Cite: Qing-Feng Liu, Shuai-Fang Xiao, Kai-Zhi Huang, and Zhou Zhong, "A SVD-Based Optical MIMO Precoding Scheme in Indoor
Visible Light Communication," International Journal of Future Computer and Communication vol. 3, no. 6, pp. 421-426, 2014.