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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.
The design of orthogonal and non-orthogonal modulation transmission schemes for inter-cell interference (ICI) environment in visible light communication system is proposed.The proposed modulation transmission scheme design focuses on improving the performance of small cells Interference on the BER performance and channel transmission capacity of visible light system, and the performance analysis and simulation of orthogonal modulation transmission scheme are given.Using the bipolar phase shift keying BPSK modulation scheme to eliminate the inter-cell interference problem, improve the system’s bit error rate performance and improve the transmission capacity.Because the pulse signal of each interval is orthogonal, the increase of the number of cells makes the modulation signal bandwidth increase.Nonorthogonal Pulse (NOP) scheme makes the adjacent cells reuse the same pulse signal to reduce the system bandwidth requirements.Orthogonal pulse, orthogonal and non-orthogonal pulse multiplexing three different modulation transmission scheme to compare The inter-cell interference problem is improved and the theoretical solutions and simulation results of bit error rate and channel capacity of the three modulation schemes are also given.The results show that the orthogonal pulse transmission scheme Higher transmission efficiency in the cell interference environment, and the system is superior to the non-orthogonal pulse modulation schemes.