Research On Non-orthogonal Waveform Technology In 5G Mobile Communication

With the study on the fifth generation mobile communication (5G), key performance indicators have been basically determined. Waveform is one of the key technologies of system design, network planning and equipment development of wireless communication, which has important research and application value. The industry has basically reached a consensus on the use of multi carrier waveforms. However, due to enhanced mobile broadband, Massive machine-type-communications, high mobility and other new needs arising, research focus on the traditional Orthogonal Frequency Division Multiplexing (OFDM) turned to non-orthogonal waveforms which are more robust in asynchronous, high-speed mobile environments. Currently the study of the non-orthogonal multi carrier waveform is mainly the theory analysis and the simulation analysis with simple assumption. The representative non-orthogonal waveforms and their performance in 5G communication scenarios are studied and improved in this thesis.The main work and innovation are as follows:a. There are two main design ideas of non-orthogonal waveform:using a filter or constructing a special data structure to produce non-orthogonal waveform. Selected two waveforms from these ideas, named Resource Block Filtered Orthogonal Frequency Divided Multiplexing (RB F-OFDM) and Zero Tail Discrete Fourier spread Orthogonal Frequency Division Multiplexing (ZT DFT-s-OFDM), and analyzed their principle, simulation reproduction and compared their performance.b. A method is proposed to improve the high peak to average power ratio (PAPR) of RB F-OFDM. After theoretical analysis and simulation, a new non-orthogonal wave form-Discrete Fourier Transform spread of Resource Block Filtered Orthogonal Frequency Division Multiplexing (DFT-s RB F-OFDM) was put forward.c. The computational complexity, time efficiency and frequency efficiency of the above three kinds of waveforms were analyzed and compared in this thesis.d. The performance of the three waveforms was studied in the typical 5G high speed mobile scenario, especially in the large Doppler frequency offset scenario, and the adaptability of the non-orthogonal multi carrier waveforms to the environment was analyzed.