中文摘要：

介绍了弱湍流信道条件下光强闪烁的对数正态分布模型,结合大气信道特点,推导了自由空间光通信未编码系统和RS编码系统在开关键控（OOK）、脉冲位置调制（PPM）、差分脉冲位置调制（DPPM）和数字脉冲间隔调制（DPIM）方式下的平均误码率公式,并用数值仿真的方法分析了它们的平均误码率性能.仿真结果表明,采用RS编码可以有效地增加信噪比增益,改善大气湍流对通信链路性能的恶化,能够提高系统的抗干扰能力,在无线光通信系统中将有一定的应用前景.

英文摘要：

Free space optical（FSO） communication based on the log-normal model under the weak turbulence channel was introduced.Combining the characteristics of atmospheric channel,the bit error rate （BER） calculating formula of uncoded and RS coded system were derived based on on-off keying（OOK）,pulse position modulation（PPM）,differential pulse position modulation（DPPM） and digital pulse interval modulation （DPIM）.Then as a benchmark,under the case of independent with identical distribution,the average bit error rates of RS coded system were derived respectively.Simulation results show that,RS coded is efficient to get the code gain and to improve jamming-rejection capability of system,and it is well suited for optical wireless communication system.