Research On Key Technologies Of LTE And Wi-Fi Co-Location Interference Suppression Optimization

In recent years,with the development of cellular mobile communication technology and the popularization of intelligent wireless communication devices,applications of LTE and Wi-Fi networks become increasingly widespread.In order to make full use of space resources and save construction costs,communication operators began to consider the situation of LTE and Wi-Fi base station co-location.According to the frequency band division,LTE and Wi-Fi operating in the 2 GHz band will have coexistence of adjacent frequencies in the 2.4 GHz band,and the adjacent channel interference will affect system performance and degrade user experience.In order to suppress the adjacent channel interference and improve the quality of wireless communication,this paper studies the key techniques of interference suppression in the LTE and Wi-Fi co-location scenarios.First,we analyze the requirements for LTE and Wi-Fi co-location interference suppression.Through analysis of the main technical indicators and transmission spectrum templates of LTE and Wi-Fi systems,it is concluded that to completely suppress the adjacent-channel interference between the Wi-Fi signal and the LTE signal,when the LTE and Wi-Fi demodulation thresholds keep unchanged,the interference cancellation capability required to be achieved is 93.5dB.Through the analysis of common interference suppression schemes,the interference suppression scheme combining antenna isolation and digital interference suppression is determined.Secondly,we discuss the key technologies of LTE and Wi-Fi co-site interference suppression.Firstly,the RF feedback LTE and Wi-Fi co-location structure is designed.Based on the structure,a typical RLS digital self-interference suppression algorithm applied to standard waveforms is discussed.Then,aiming at the high complexity of the RLS algorithm,a new waveform with an overhead of no more than five thousandths based on the standard waveform is proposed.Combined with the unique structure of the new waveform,the digital interference cancellation algorithm with linear complexity is studied and analyzed.Finally,we simulate and verify the various structures and algorithms proposed in the paper.The simulation includes the performance of the co-location structure of RF and baseband feedback forms,the standard waveform and its corresponding RLS digital interference cancellation algorithm,the new waveform and its corresponding linear complexity digital interference cancellation algorithm,and the linear complexity digital interference cancellation algorithm.The main parameters of the algorithm's performance,etc.The paper mainly studies the issue of the adjacent channel interference suppression in LTE and Wi-Fi co-location scenarios.The new waveform and linear complexity digital interference suppression algorithm proposed in this paper can be applied to multi-antenna scenes,and the complexity of the digital interference suppression algorithm is reduced from O(n2)of the RLS algorithm to O(n),which contributes to less investment in hardware and power consumption in practical engineering applications.