Recently, research on visible light communication (VLC) and optical wireless communication (OWC) has grown. The advantages of these technologies, such as ubiquitous availability, high bandwidth and unlicensed spectrum, are well known, and many other applications are still being explored. Although VLC cannot replace the more popular radio frequency (RF) based system, it is expected that VLC can be widely deployed and used indoors for multiple applications, including Giga bit data rate. At the same time, there is a technological difference in operation. However, many of the RF techniques are tested and evaluated in VLC. For example, multiple light-emitting diodes (LEDs) forming the VLC emitter and multiple photodetectors (PDs) of the VLC receiver are considered a multiple input multiple output (MIMO)-based system. It has been demonstrated that MIMO techniques can provide advantages in VLC systems under line-of-sight (LOS) conditions. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an original essay Several optical MIMO techniques, including repetition coding (RC), spatial modulation (SM), spatial multiplexing (SMP), have been studied and their performance is analyzed. They have also been discussed for multi-user VLC. SM is shown to offer better spectral efficiency, especially at low SNRs, and robustness in channel correlation compared to RC and SMP. However, RC requires larger constellations to achieve high data rate, and SMP improves this performance by taking full advantage of the multiplexing gains. Furthermore, generalized spatial modulation is another scheme to improve spectral efficiency and reduce the number of transmitters in the RF system. Even in the optical domain, the authors studied this generalized spatial modulation. The authors compared the BER performance of generalized spatial modulation with other MIMO schemes including SMP and SM. Generalized spatial modulation is proven to perform better. Furthermore, it is concluded that the performance of VLC based on generalized spatial modulation improves if the power half-angle of the LEDs is decreased by half. In this work, we extended the study to the case of multi-user detection viewpoint. On the VLC receiver, two user terminals are considered, each with two optical receivers. The generalized spatial modulation scheme is studied compared to conventional MIMO and SM MIMO schemes for multi-user VLC. Furthermore, the single LED power and signal-to-noise ratio (SNR) performance using different fields of view (FOV) on the receiver for the multi-user VLC system are also discussed and presented. In this work, the room area of ​​5m×5m×3m for multi-user MIMO indoor VLC systems is considered. First, we analyze conventional MIMO and SM MIMO and their BER performance. Next, we analyze MIMO generalized spatial modulation and its BER performance. The precoding algorithm is used to eliminate multi-user interference (MUI) in the transmitter by pre-processing the data of each user terminal. The results show that generalized spatial modulation performs better. Please note: this is just an example. Get a custom paper from our expert writers now. Get a Custom Essay The rest of this document is organized as follows. The multi-user MIMO VLC system is presented in section II, while different transmission techniques are discussed in section III. The simulation results and discussion are outlined in Section IV. Section V.