CAJ | 학술논문

为了有效抵御大气散射效应和提高频谱利用率，提出了自由空间光通信正交频分复用系统。由于大气信道的不稳定性，该系统在传输过程中导致误码率很高。将里德-所罗门码引入自由空间光通信正交频分复用系统中，对其进行了半实物仿真，仿真结果表明：当误码率为10-2时，正交频分复用较开关键控性能优越4 dB ；在广延雨、平流雾、沙尘天等不同的天气条件下，当误码率为10-5时，里德-所罗门（255，223）信道编码较未编码性能优越4～5 dB 。正交频分复用系统和里德-所罗门码的技术能降低系统的误码率。
위료유효저어대기산사효응화제고빈보이용솔，제출료자유공간광통신정교빈분복용계통。유우대기신도적불은정성，해계통재전수과정중도치오마솔흔고。장리덕-소라문마인입자유공간광통신정교빈분복용계통중，대기진행료반실물방진，방진결과표명：당오마솔위10-2시，정교빈분복용교개관건공성능우월4 dB ；재엄연우、평류무、사진천등불동적천기조건하，당오마솔위10-5시，리덕-소라문（255，223）신도편마교미편마성능우월4～5 dB 。정교빈분복용계통화리덕-소라문마적기술능강저계통적오마솔。
For the purpose of effective resisting of the atmospheric scattering and impoving of the spectrum utilization rate .Free space orthogonal frequency division multiplexing (FSO-OFDM ) system is proposed .Due to the instability of the atmospheric channel ,the system ,which is still in the process of transmission ,will be affected by various factors ,resulting in a high error rate .Reed-Solomon(RS) code is applied to the FSO-OFDM system .At last ,the semi-physical simulation has been conducted .The simulation results show that when the BER is 10-2 ,the performance of orthogonal frequency division multiplexing (OFDM ) is superior to 4 dB compared with OOK .In different weather conditions (extensa rain ,advection fog ,dust days) ,when the BER is 10-5 ,the performance of RS(225 ,223) channel coding is superior to 4 ~ 5 dB compared with uncoding .The results show that ,OFDM system and RS code technology can reduce the system BER .