摘要
针对无线非视距紫外通信中的大气信道模拟问题,提出将最大似然序列估计均衡器应用于无线非视距紫外通信中。推导紫外通信中接收信号的概率密度函数,以此近似研究均衡器的输出误码率。理论分析与仿真结果表明,在短距离通信时,大气衰减系数与信道带宽的变化不影响均衡器性能。在接收信噪比不变的较长距离通信时,两者的变化对均衡器性能影响明显。信道记忆长度等因素对均衡器性能影响显著,而对调制方式不敏感。
For simulation of the atmosphere channel in the Non-Line-of-Sight（NLOS） ultraviolet communications,this paper proposes the application of Maximum Likelihood Sequence Estimation（MLSE） in wireless ultraviolet NLOS communication.The probability density function of the received signals is derived in ultraviolet communication so that the output bit error rate of equalizer can be studied.The theoretical analysis and simulation results show that the performance of equalizer is nearly not affected by the attenuation coefficient and channel bandwidth for the short range communication,but is sensitive to variation of both for the long range communication with the same Signal-to-Noise Ratio（SNR）.Meanwhile,the performance of equalizer is sensitive to variation of channel length,and not sensitive to modulation schemes.
出处
《计算机工程》
CAS
CSCD
2012年第20期72-75,80,共5页
Computer Engineering
关键词
非视距
紫外通信
最大似然序列估计
均衡器
码间干扰
信噪比
Non-Line-of-Sight（NLOS）
ultraviolet communication
Maximum Likelihood Sequence Estimation（MLSE）
equalizer
inter-symbol interference
Signal-to-Noise Ratio（SNR）
