Design And Hardware Implementation Of SC-FDMA Communication System

With the rapid development of mobile communication technology,wireless communication technology is also evolving,among them,Orthogonal Frequency Division Multiplexing(Orthogonal Frequency Division Multiplexing Access,OFDM)and SingleCarrier Frequency Division Multiple Access(Single Carrier-Frequency Division Multiple Access,SC-FDMA)etc.,are derived,which are all designed to increase the communication transmission rate to achieve greater capacity information communication.However,in the communication air interface modulation technology,SC-FDMA is lower than OFDM in peak-to-average power ratio,which has the practical significance of reducing equipment cost.Therefore,this paper mainly studies SC-FDMA communication system.The paper first introduces the background and significance of the research,introduces the development process of communication system,the development of SC-FDMA technology and FPGA technology,and expounds the structure and work arrangement of the paper.Then,it introduces the basic structure of the communication system,the frequency domain formation method of SC-FDMA,expounds the composition and function of each structure,and introduces the theoretical basis in the structural design,and then divides the two parts according to the transmitting end and the receiving end.Introduce the key technologies in these two sections.Next is the design of the FPGA process plan for the entire SC-FDMA system.First,the overall description of the structure flow of the communication system and a brief introduction to the use method.In the design of the transmitter part,the design scheme of channel coding is mainly introduced.The Turbo coding scheme is adopted,and the addition of CRC check code,recursive convolutional code,rate matching and puncturing in the coding scheme are introduced in detail.The channel coding ensures the reliability of the system transmission;then the channel interleaving,and the modulation module of the SCFDMA,wherein the subcarrier mapping module in the modulation module is mainly introduced,and the method adopted is distributed mapping;at the receiver in part,the synchronization module is introduced in detail,because the time-frequency characteristics of the channel have an impact on the transmitted data.Therefore,the synchronization header sequence used is a ZC sequence with good autocorrelation properties.Next,the channel estimation and equalization design scheme is introduced.And the basic idea,the channel estimation method is the least squares estimation and the mean interpolation method combined with the discrete Fourier transform to remove the noise technique to estimate the channel frequency response,and then use the zero-breaking equalization method for the estimation result,and then introduce the channel decoding.In the method,Turbo decoding is performed by Log_MAP method.Finally,the thesis carries out simulation verification and FPGA implementation of the communication module's system scheme.It mainly introduces the hardware implementation methods and processes of the two ends of the originating and receiving ends.It connects the computer and hardware platform through the JTAG port,and burns the generated bitstream file to in the FPGA hardware board,the logic analysis of the software is used to verify the analysis timing and perform functional tests on the hardware platform.The design shows that the SC-FDMA communication system designed in this paper uses a highly integrated hardware platform to optimize the program,which effectively reduces the size and power consumption of the device,and has good application and research value.