针对在水下无线光通信(Underwater Wireless Optical Communication,UWOC)中使用直流偏置光正交频分复用(Direct Current Optical-Orthogonal Frequency Division Multiplexing,DCOOFDM)技术导致的峰均比(Peak-to-Average Power Ratio,P...针对在水下无线光通信(Underwater Wireless Optical Communication,UWOC)中使用直流偏置光正交频分复用(Direct Current Optical-Orthogonal Frequency Division Multiplexing,DCOOFDM)技术导致的峰均比(Peak-to-Average Power Ratio,PAPR)过高的问题,基于部分传输序列(Partial Transmit Sequence,PTS)方法,使用粒子群优化-遗传因子算法(Partial Swarm Optimization-Genetic Algorithm,PSO-GA)联合算法寻找最佳相位因子,以降低PAPR。仿真结果表明,使用联合算法寻找最佳相位因子,在互补累积分布函数(Complementary Cumulative Distribution Function,CCDF)为10-4时,可以使得系统的峰均比降低约3 dB。相较于传统PTS算法与限幅算法,PSO-GA算法在保证PAPR性能改善的前提下,没有牺牲误码率性能。展开更多
This paper is a survey of transmit antenna selection-a low-complexity, energy-efficient method for improving physical layer security in multiple-input multiple-output wiretap channels. With this method, a single anten...This paper is a survey of transmit antenna selection-a low-complexity, energy-efficient method for improving physical layer security in multiple-input multiple-output wiretap channels. With this method, a single antenna out of multiple antennas is selected at the transmitter. We review a general analytical framework for analyzing exact and asymptotic secrecy of transmit antenna selection with receive maximal ratio combining, selection combining, or generalized selection combining. The analytical results prove that secrecy is significantly improved when the number of transmit antennas increases.展开更多
The co-channel interference(collisions) seriously affect the transmission for the newly deployed wireless sensor networks since there is no structure at that phase.In this paper,the interference of the whole network i...The co-channel interference(collisions) seriously affect the transmission for the newly deployed wireless sensor networks since there is no structure at that phase.In this paper,the interference of the whole network is analyzed based on the SNIR model.The new concept of critical transmitting range is proposed,based on which the transmission theorem is obtained and proved.The results provide the theoretical ground to set up the primary structure of newly deployed networks.展开更多
文摘针对在水下无线光通信(Underwater Wireless Optical Communication,UWOC)中使用直流偏置光正交频分复用(Direct Current Optical-Orthogonal Frequency Division Multiplexing,DCOOFDM)技术导致的峰均比(Peak-to-Average Power Ratio,PAPR)过高的问题,基于部分传输序列(Partial Transmit Sequence,PTS)方法,使用粒子群优化-遗传因子算法(Partial Swarm Optimization-Genetic Algorithm,PSO-GA)联合算法寻找最佳相位因子,以降低PAPR。仿真结果表明,使用联合算法寻找最佳相位因子,在互补累积分布函数(Complementary Cumulative Distribution Function,CCDF)为10-4时,可以使得系统的峰均比降低约3 dB。相较于传统PTS算法与限幅算法,PSO-GA算法在保证PAPR性能改善的前提下,没有牺牲误码率性能。
文摘This paper is a survey of transmit antenna selection-a low-complexity, energy-efficient method for improving physical layer security in multiple-input multiple-output wiretap channels. With this method, a single antenna out of multiple antennas is selected at the transmitter. We review a general analytical framework for analyzing exact and asymptotic secrecy of transmit antenna selection with receive maximal ratio combining, selection combining, or generalized selection combining. The analytical results prove that secrecy is significantly improved when the number of transmit antennas increases.
文摘The co-channel interference(collisions) seriously affect the transmission for the newly deployed wireless sensor networks since there is no structure at that phase.In this paper,the interference of the whole network is analyzed based on the SNIR model.The new concept of critical transmitting range is proposed,based on which the transmission theorem is obtained and proved.The results provide the theoretical ground to set up the primary structure of newly deployed networks.
