The performance of underwater wireless optical communication(UWOC)system is degraded due to the influence of seawater transmission path loss,ocean turbulence effect,and pointing error during the transmission of optica...The performance of underwater wireless optical communication(UWOC)system is degraded due to the influence of seawater transmission path loss,ocean turbulence effect,and pointing error during the transmission of optical signals.In order to solve this problem,an orthogonal frequency division multiplexing(OFDM)UWOC system composite channel model based on wavelength diversity was established,and the analytical expressions for the outage probability and the average symbol error rate(SER)of the system were derived.The system performance of wavelength diversity UWOC is investigated under different pointing errors,number of subcarriers,and maximum ratio combining(MRC)and equal gain combining(EGC)schemes.The results show that the performance of the UWOC system using the wavelength diversity technique is significantly improved.Compared with the no-diversity system,a diversity order of 3 reduces the outage probability from 10-3to the order of 10-8and the average SER from 10-2to 10-7.A smaller pointing error reduces the outage probability of the system.Additionally,a larger ratio of beam width to receiver aperture also decreases the outage probability.Increasing the number of subcarriers will increase the system's average symbol error rate.展开更多
基金supported by the Equipment Pre Research Joint Fund Funded Project by the Ministry of Education of China(8091B032130)。
文摘The performance of underwater wireless optical communication(UWOC)system is degraded due to the influence of seawater transmission path loss,ocean turbulence effect,and pointing error during the transmission of optical signals.In order to solve this problem,an orthogonal frequency division multiplexing(OFDM)UWOC system composite channel model based on wavelength diversity was established,and the analytical expressions for the outage probability and the average symbol error rate(SER)of the system were derived.The system performance of wavelength diversity UWOC is investigated under different pointing errors,number of subcarriers,and maximum ratio combining(MRC)and equal gain combining(EGC)schemes.The results show that the performance of the UWOC system using the wavelength diversity technique is significantly improved.Compared with the no-diversity system,a diversity order of 3 reduces the outage probability from 10-3to the order of 10-8and the average SER from 10-2to 10-7.A smaller pointing error reduces the outage probability of the system.Additionally,a larger ratio of beam width to receiver aperture also decreases the outage probability.Increasing the number of subcarriers will increase the system's average symbol error rate.
