The Realization Of Millimeter Wave Communication Hardware And IQ Imbalance Compensation Technology Research

As one of the key technologies of 5G,millimeter wave wireless communication receives more and more attention.Unlike traditional communication systems,the implementation of high-frequency millimeter-wave communication faces many challenges.This thesis designs a millimeter wave SC-FDE system architecture on the NI-PXIe hardware platform,completes the algorithm design and hardware implementation of the transceiver module,and finally achieves the goal of real-time transmission of high-definition video.In addition,the problem of IQ imbalance caused by RF damage at the receiver of the millimeter-wave system was studied in this thesis.This article includes the following aspects:First,the key technologies of the SC-FDE system are studied.According to the existing millimeter wave communication protocol,a concise frame structure design scheme is proposed under the condition to satisfy communication requirements.After that,the data processing flow of the sender and receiver of the SC-FDE system is analyzed,and the algorithms of pulse shaping and matched filtering,timing synchronization,channel estimation and equalization are studied in detail.Next,the problem of IQ imbalance caused by hardware damage in the down-converting process of millimeter-wave SC-FDE system is studied in the thesis.The IQ-imbalanced model of the receiver-independent frequency is studied and its influence on the system performance is analyzed.Then,under the SISO millimeter wave channel conditions,IQ imbalance parameters and channels are estimated separately based on the ZC pilot sequence,and a scheme for compensating the data by combining IQ imbalance and channel information is proposed,and a simple LS method can be used.Restore data.This IQ imbalance estimation and compensation method is also applicable to MIMO millimeter-wave SC-FDE systems because the estimated IQ imbalance parameters and channel information need to be increased,and the pilot data must be increased accordingly.The simulation results verify the effect of IQ imbalance estimation and compensation algorithm,and can accurately estimate the IQ imbalance parameters,and effectively compensate the impact of IQ imbalance on the data.Then,the NI-PXIe hardware platform is analyzed and the millimeter-wave SC-FDE system architecture is designed.After analyzing the existing NI-PXIe hardware equipment,its performance parameters can meet the requirements of millimeter-wave communication.Then this thesis presents the architecture of the millimeter-wave SC-FDE system,and analyzes the data processing flow of the transmitter and receiver together with the hardware equipment.In addition,from the three perspectives of PC,Host,and FPGA,the design of the system architecture is explained.Different from the traditional communication system,the millimeter-wave system FPGA of this thesis adopts the parallel and timing control method when transmitting and processing data,which not only accelerates the data processing speed,but also does not exceed the clock frequency of the FPGA,and also improves the system's stability.Finally,a millimeter-wave SC-FDE communication system is implemented on the hardware platform.The hardware implementation mainly includes channel coding and decoding,constellation mapping and demapping,pulse shaping and matched filtering,timing synchronization,channel estimation and equalization modules.In order to reduce the requirement for the FPGA clock frequency,the data processing in the hardware implementation process adopts a parallel design principle.For the channel encoding and decoding module,the traditional serial encoding and decoding will exceed the clock frequency of the FPGA.The parallel encoding and decoding will consume too many FPGA resources.Therefore,taking into account the FPGA clock frequency and hardware resources,this thesis proposes a serial and parallel combined channel coding and decoding scheme which is suitable for millimeter-wave systems,it can maximize the use of FPGA clock frequency,save hardware resources,and apply to a variety of coding bit rates at the same time.The final millimeter-wave system achieves real-time transmission and presentation of high-definition video at data transmission rates up to 7 Gbps.