Low Complexity Of The Receiver Design For Millimeter-Wave Large-Scale Antenna Systems

With the rapid development of communication technology,under the promotion of the 5G commercial plan in 2020,people have researched on 5G millimeter-wave system more deeply.On the large-scale antenna millimeter wave system,it is a very critical technology about the receiver structure and signal processing.The number of antennas is limited on the conventional MIMO receiver,so it is possible to support one radio frequency(RF)chain for each receiving antenna.However,the conventional MIMO receivers need to use a large number of RF chains and analog to digital converters.However,in millimeter-wave communication systems,large-scale antenna arrays cannot afford a large number of RF chains,which have large power consumption,high cost,high complexity,and limited space.Although there are many kinds of existing receivers that can be developed to reduce the number of RF chains,such as hybrid analog/digital structures.However,most of them are based on the assumption that the channel state information is perfectly known.In fact,this assumption is difficult to implement under the existing hardware architectures,which means they may need another solution or device specifically designed for channel estimation.It will need additional cost and high complexity.Therefore,the research on millimeter-wave receiver technology mainly involves two aspects:(1)The large power consumption of the RF chains,how to effectively reduce the number of RF chains and design the new structure of the millimeter-wave receiver;(2)Design a corresponding channel estimation method based on the structure of the receiver.In this thesis,for the single-user and multi-user system,a novel receiver is specially designed in the millimeter-wave large-scale antenna uplink system.At the same time,the corresponding channel estimation method is specially designed for the structural characteristics of this receiver.The concrete results include two aspects: on the one hand,for the millimeter-wave large-scale antenna MIMO uplink system,we research and develop massive MIMO receivers which are low-complexity,low power consumption,low construction cost,low space construction area and can effectively reduce the number of radio frequency chains;on the other hand,under the structure of this receiver design and the premise that the base station cannot accurately know the channel state information,we further study the corresponding signal processing method,including signal transmission,channel estimation and low-complexity decoding methods.The simulation results show that the bit error rate performance of the newly proposed millimeter wave receiver is only slightly less than the conventional receiver.From the analysis of hardware devices,the number of RF chains and analog-to-digital converters is greatly reduced,thereby greatly reducing power consumption,construction cost,space occupied area,and improving space utilization.