中文摘要：

提出了可见光通信系统中针对小区间干扰（ICI）环境下的的正交和非正交调制传输方案设计.所提出的调制传输方案设计着重改善多小区同时传输非同步光信号而导致的小区间干扰对可见光系统误码率性能及信道传输容量的影响,并给出了正交调制传输方案的性能分析和仿真.用干扰环境下的正交脉冲（OP）信号的双极相移键控（BPSK）调制方案来消除小区间干扰的问题,改善系统误码率性能并提高传输容量.由于每个区间的脉冲信号正交,小区个数的增加使得调制信号带宽增大.设计了非正交脉冲（NOP）方案使得相邻较远的小区可以复用相同的脉冲信号来减小系统带宽需求.比较了正交脉冲、复用正交脉冲和非正交脉冲3种不同的调制传输方案对小区间干扰问题的改善效果,同时也给出了3种调制传输方案的误码率和信道容量的理论解和仿真结果.结果表明：正交脉冲传输方案在小区干扰环境下传输效率更高,并且系统性能明显优于非正交脉冲调制方案.

英文摘要：

This paper proposes the orthogonal and nonorthogonal schemes in the interference environments for visible light communication（ VLC） systems. The proposed schemes pay attention to the case when different bit streams from multiple cells are simultaneously transmitted, which consequently causes inter-cell interference（ ICI） and greatly deteriorates the bit error rate（ BER） and channel capacity performance of the system. The performance of the newdeveloped multi-cell system in indoor VLC systems is evaluated. The bipolar phase shift keying（ BPSK） modulation scheme with orthogonal pulses（ OPs） for multiple cells environments is employed to mitigate the ICI problem and improve the BER and channel capacity performances. Since the use of different OPs in each cell requires more number of OPs, which requires high bandwidth, OPs are reused at certain distances. Three different schemes, which are OPs,orthogonal and non-orthogonal pulses（ NOP） reuse, are compared. This paper investigates the impact of using these schemes and compared their performances in the ICI environments. The BER and channel capacity using the proposed schemes are comprehensively examined. Simulation and theoretical results showthat the OPs schemes are more effective in the interference areas of the room and significantly outperform NOP.