Design And Implementation Of MIMO Precoding In FBMC-OQAM System Based On USRP RIO

In the next generation mobile communication technology,the Filter Bank Multicarrier with Offset Quadrature Amplitude Modulation(FBMC-OQAM)technique has become one of the alternatives to traditional Orthogonal Frequency Division Multiplexing(OFDM)technology.At the same time,MIMO technology can increase the capacity of the system without increasing the frequency resources.Therefore,it is of great research value to implement MIMO technology in FBMC-OQAM system.However,the use of MIMO technology also introduces inter-user interference.Precoding technology can effectively eliminate the interference between multiple users.The FBMC-OQAM MIMO system is implemented by building a hardware platform based on Universal Software Radio Peripheral(USRP)to verify its advantages.This paper first introduces the principle of discrete FBMC-OQAM system and its advantages over the traditional OFDM system,and focuses on the whole process of implementing the precoding in the FBMC MIMO system.In order to implement the precoding in the actual system,we must know the channel state information.According to the frame structure of FBMC-OQAM system and the advantages of OFDM signal,this paper designed a unique pilot to estimate the channel state.This pilot design can effectively solve the interference problem between multiple antennas.At the receiver,this paper uses the least squares method to calculate the channel state,and the linear interpolation is used to predict the channel state which has non pilot information.After the channel state is obtained,WiFi is used to feedback the channel state to the sender through the router.The sender uses the received channel state information to precode the transmitted data using the ZF precoding scheme and recover it at the receiving end.So that the multi-channel data can transmit at the same time and same frequency band without interference.All of the above processes are implemented through Labview,at the end of this paper,the simulation and test results are given.