Academician Ke Xizheng is a well-known expert in the field of optical wireless communication, a foreign academician of the Russian Academy of Natural Sciences, a famous teaching teacher in Shaanxi Province, a member of the Chinese Institute of Electronics, an expert in the evaluation of national science and technology awards, and a member of the Disciplinary Evaluation Group of the Third Academic Degree Committee of Shaanxi Province. For more than 20 years, he has actively explored and is not afraid to move forward; he has worked quietly on the road of teaching and educating people and has not forgotten his mission. Since 2001, he has won 20 provincial and ministerial science and technology awards, more than 30 invention patents authorized by the state, published more than 20 monographs in Science Press and Springer Press, and published more than 400 academic papers. and more than 10 journal editorial board members, and a part-time job in more than 10 academic groups including the Chinese Institute of Electronics, enjoying a high reputation in the field of electronic information.

• Introduction.- Subcarrier modulation techniques.- Nonlinear characteristics of semiconductor lasers and their correction.- FSO OFDM systems.- Atmospheric channels.-Synchronization technology of OFDM systems.- Peak to average power ratio in an FSO OFDM modulation system.- Definition and statistical properties of a peak to average power ratio.- Channel estimation and channel assignment.- OFDM system based on subcarrier heterodyne detection.- Multi band carrier free amplitude phase modulation.

Academician Ke Xizheng is a well-known expert in the field of optical wireless communication, a foreign academician of the Russian Academy of Natural Sciences, a famous teaching teacher in Shaanxi Province, a member of the Chinese Institute of Electronics, an expert in the evaluation of national science and technology awards, and a member of the Disciplinary Evaluation Group of the Third Academic Degree Committee of Shaanxi Province. For more than 20 years, he has actively explored and is not afraid to move forward; he has worked quietly on the road of teaching and educating people and has not forgotten his mission. Since 2001, he has won 20 provincial and ministerial science and technology awards, more than 30 invention patents authorized by the state, published more than 20 monographs in Science Press and Springer Press, and published more than 400 academic papers. and more than 10 journal editorial board members, and a part-time job in more than 10 academic groups including the Chinese Institute of Electronics, enjoying a high reputation in the field of electronic information.

• Introduction.- Subcarrier modulation techniques.- Nonlinear characteristics of semiconductor lasers and their correction.- FSO OFDM systems.- Atmospheric channels.-Synchronization technology of OFDM systems.- Peak to average power ratio in an FSO OFDM modulation system.- Definition and statistical properties of a peak to average power ratio.- Channel estimation and channel assignment.- OFDM system based on subcarrier heterodyne detection.- Multi band carrier free amplitude phase modulation.

Academician Ke Xizheng is a well-known expert in the field of optical wireless communication, a foreign academician of the Russian Academy of Natural Sciences, a famous teaching teacher in Shaanxi Province, a member of the Chinese Institute of Electronics, an expert in the evaluation of national science and technology awards, and a member of the Disciplinary Evaluation Group of the Third Academic Degree Committee of Shaanxi Province. For more than 20 years, he has actively explored and is not afraid to move forward; he has worked quietly on the road of teaching and educating people and has not forgotten his mission. Since 2001, he has won 20 provincial and ministerial science and technology awards, more than 30 invention patents authorized by the state, published more than 20 monographs in Science Press and Springer Press, and published more than 400 academic papers. and more than 10 journal editorial board members, and a part-time job in more than 10 academic groups including the Chinese Institute of Electronics, enjoying a high reputation in the field of electronic information.

• Introduction.- Subcarrier modulation techniques.- Nonlinear characteristics of semiconductor lasers and their correction.- FSO OFDM systems.- Atmospheric channels.-Synchronization technology of OFDM systems.- Peak to average power ratio in an FSO OFDM modulation system.- Definition and statistical properties of a peak to average power ratio.- Channel estimation and channel assignment.- OFDM system based on subcarrier heterodyne detection.- Multi band carrier free amplitude phase modulation.