针对多用户室内可见光系统，提出了基于预编码算法的多用户多入多出系统模型，通过对发送信号的预处理，在发送端将多用户干扰消除，从而有效降低用户终端的复杂度和功耗.基于4×［2, 2］的室内多用户多入多出可见光通信系统，分析了块对角化预编码算法在室内可见光系统中的局限，并提出了相应的解决方案，即同一用户终端的不同光接收机采用不同的视场角.分析了用户终端的位置对系统信噪比、误码率性能的影响.数值模拟结果表明，当单个发光二极管芯片的发射功率为10 mW时，在室内大部分区域，系统在100 Mb/s 的传输速率下能够达到10－6左右的误码率性能.

A precoding multiuser MIMO model was proposed for the multiuser indoor visible light communication system. The multiuser interference was eliminated by data preprocessing in transmitter, leading to the reduction of complexity and power consumption of terminals in the VLC system. Based on a 4×［2, 2］ indoor MUMIMO VLC system, the limitation of block diagonalization precoding algorithm in VLC system was figured out. The corresponding solution by utilizing receivers with different field of view was analyzed. The impact of the terminals′ location to BER and SNR performances of the proposed system was also investigated. Based on the numerical results of the proposed indoor VLC system, the terminals can achieve 100 Mb/s at a BER of 10－6 in the most indoor area when single LED chip′s power is 10 mW.