无线紫外光MIMO湍流信道中BCOSTBC编码研究

针对在准确估计信道情况下无线紫外光MIMO湍流信道中如何有效地获得全分集增益这一问题。首先研究了无线紫外光通信的传输特性,然后研究了MIMO信道以及影响紫外光通信的主要因素。最后,采用比特补码式正交空时码(BCOSTBC)编码,推导出在弱湍流情况下直视(LOS)和非直视(NLOS)的误码率公式。实验结果表明,采用编码后1×2、2×1和2×2系统的误码率性能在LOS和NLOS情况下分别约改善了3、6和9 d B。增加光电探测器数目可以提高分集增益,有益于系统性能的改善;其中,2×2系统需要的发射功率最小,传输的距离更远,数据传输速率更大,误码率更低;在NLOS条件下通过小角度收发仰角能够改善系统的误码率性能。

Research on BCOSTBC for wireless UV MIMO communication turbulent channel

Aiming at the problem of how to effectively obtain the full diversity gain in the wireless ultraviolet Multi-input Multiple-output (MIMO) turbulence channel in the case of accurate estimation of the channel,the transmission characteristics of wireless ultraviolet communication are firstly studied,and then the MIMO channel and the main factors affecting the ultraviolet communication are studied.Finally,the bit error rate formula of LOS and NLOS is derived by using bit complementary orthogonal space-time code (BCOSTBC) coding.The experimental results show that the bit error rate performance of 1 × 2,2 × 1,2 × 2 system is improved by 3,6 and 9 dB respectively in LOS and NLOS.Increasing the number of photodetector can increase the diversity gain.The 2 × 2 system needs the least transmission power,the transmission distance is farther,the data transmission rate is bigger,the bit error rate is lower.In the NLOS condition,through the small angle transmission angle can improve the system bit error rate performance.