Research On Key Technologies Of BOMA-OFDM Based Radio Over Fiber Communication System

With the development of mobile communication and Internet of Things,the demand for data traffic and access number is increasing.As the spectrum resources are limited,further improving the spectrum efficiency of communication networks has become the main research mission of the fifth-generation(5G)wireless communication.Thus,non-orthogonal multiple access(NOMA)technology has become one of the research hotspots due to its high spectral efficiency and large number of accesses.At the same time,in order to overcome the disadvantages of orthogonal frequency division multiplexing(OFDM)technology in the fourth-generation(4G)communication,some new modulation formats with higher spectral efficiency are proposed,such as: filtered orthogonal frequency division multiplexing(f-OFDM),orthogonal frequency division multiplexing with offset quadrature amplitude modulation(OFDM/OQAM).In addition,the rapid development of mobile communications has brought a lot of energy consumption.The radio over fiber(RoF)technology combines the low-loss,high-speed of fiber-optic communication and the flexibility of wireless communication,thus has been considered as a solution to the problem of energy consumption in wireless communication.The research work of this thesis focuses on the building block sparse constellation multiple access(BOMA)technology.The basic principles and application scenarios of BOMA are introduced,and the BOMA-OFDM based RoF system is experimentally demonstrated.The main research contents of this paper include:(1)The BOMA f-OFDM based RoF system is proposed.Under the same conditions,363Mb/s BOMA f-OFDM signal and 291Mb/s OFDM signal are transmitted,so the spectral efficiency of the system is increased by 24.7% in the downlink.In addition,the ability of f-OFDM to support asynchronous transmission is also demonstrated in the uplink.(2)The BOMA-OFDM/OQAM based RoF system is proposed.The spectral efficiency of the system is further improved by using the OFDM/OQAM modulation format.2.84Gb/s BOMA-OFDM/OQAM signal and 1.36Gb/s OFDM signal are transmitted in a two-user RoF system,which proves that the BOMA-OFDM/ OQAM-based RoF system can improve the spectral efficiency by 37.7% compared to the OFDMA system.(3)An optimization scheme for the BOMA-OFDM/OQAM based RoF system mentioned above is proposed.In a three-users RoF system,1.38 Gb/s BOMA-OFDM/OQAM signal and 1.15 Gb/s OFDM/OQAM signal are transmitted respectively.Experimental results show that compared with the OFDM/OQAM system,the optimized scheme improves the average spectral efficiency by 19.9% and improves the transmission performance by 2dB.