Title :
Coefficients separation MIMO-OFDM optical wireless communication system in diffuse fading channels
Author :
Wu, Liang ; Zhang, Zaichen ; Dang, Jian ; Liu, Huaping
Author_Institution :
National Mobile Communications Research Laboratory, Southeast University, Nanjing, 210096, China
Abstract :
In indoor optical wireless communication systems with intensity modulation (IM) and direct detection (DD), diffuse links could be established through reflecting. For such a case, line-of-sight does not exist between the transmitter and receiver, and the channel delay spread will be large. The dispersion of the channel might cause inter-symbol interference. Also, the transmitted signal must be nonnegative. Thus most modulation schemes for radio communications cannot be used directly for such a system. This paper develops a new multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) IM/DD systems: real and imaginary coefficients separation (RIS) system. Two transmit data streams require only one inverse fast Fourier transform (IFFT) block, resulting in a low computational complexity. Compared with traditional OFDM based schemes, the RIS scheme achieves a better BER performance and requires fewer IFFT blocks at the transmitter. The transmitter architecture and receiver algorithm are analyzed in detail. BER performance and simulation results are provided.
Keywords :
Bit error rate; MIMO; OFDM; Optical imaging; Optical receivers; Optical transmitters; Wireless communication; Optical wireless communication; diffuse fading channel; multiple input multiple output (MIMO) systems; orthogonal frequency division multiplexing (OFDM);
Conference_Titel :
Communications (ICC), 2015 IEEE International Conference on
Conference_Location :
London, United Kingdom
DOI :
10.1109/ICC.2015.7249138