Design Of Millimeter Wave Transceiver Front-end For 5G Communication

High-speed wireless communication system represented by the fifth generation(5G)has attracted wide spread attention recently.Millimeter wave band,featuring abundant spectrum resources and high data communication rate,has become a hot research orientation of 5G enhanced mobile broadband scene.This thesis focuses on the research on the transceiver front end for the millimeter wave massive MIMO system project.The main work is as follows:Firstly,the transceiver structure and performance specifications are analysed according to the overall requirements of RF system.Secondly,based on device characteristics,the scheme of harmonic mixing and external LO is given.The RF front,composed by downconversion and upconversion chain as well as filtering and amplification modules,includes devices such as low noise amplifiers,power amplifiers,frequency multipliers,mixers and filters.The RF band covers from 24.25 GHz to 30 GHz and the IF channel bandwidth is 500 MHz at 7.5GHz.The design is verified by link simulation,and main devices are fabricated and examined.Finally,the transceiver front-end is fabricated and tested.According to testing results,the in-band gain of receiver and transmitter is 8.6-11 dB and 8.3-9.8dB respectively.The gain flatness of signal in 500 MHz bandwidth is less than 1.5dB for transmitter front,with the output P1 dB and IMD3 are larger than 19 dBm and 30 dBm separately.For receiver front end,the input P1 dB and IMD3 are larger than-11 dBm and-2.5dBm.Moreover,the test results show that for input signal with 50 Msps symbol rate,the transmitter front achieves EVM lower than 2.82%,2.16%,1.90% and 1.77% for QPSK,QAM16,QAM64 and QAM 256 modulation respectively.The same coefficients for the receiver are shown as 2.51%,1.91%,1.63% and 1.55%.Measurement results show that the single-channel millimeter wave transceiver has good RF performances and channel consistency,which is suitable for massive MIMO applications.