The Design And Implementation Of The Anti-interference Algorithm Based On Digital Adaptive Beam-Forming

In the recent years,the adaptive anti-interference technologies about communication has become popular and they are the popular research target in the communication domains.The adaptive anti-interference technologies are widely deployed in many fields including radar,wireless communication and satellite communication.In the communication system,the receiving terminal may receive several interferences while receiving the interest signal.The interferences include continuous wave interference,narrow band interference,pulse signal interference,and wide band interference.The interference signals have bad influence on the reception of target signals.This may destroy the working performance of the communication systems.It is of paramount importance to elimincate the interferences in the receving end in the communication system.We have applied the suitable anti-interference algorithm to eliminate the interferences to an acceptable extent.In this paper,we have analysed the anti-interference algorithm in the communication system and came up with some improvements based on the existing algorithm.The newly proposed algorithm is name as L1-norm Linearly Constrained LMS(L1-LC-LMS)algorithm.It has brought dramatic improvement on the algorithm performance.The algorithm convergence rate has been speed up significantly and the L1-LC-LMS algorithm can provide deeper nulling effect than other LMS algorithm.Finally,we made the hardware simulation of the Linearly Constrained Minimum Variance(LCMV)algorithm in the FPGA using verilog.The paper has made the following progress:1)This paper has made a research about the current dometic and overseas situation of the communication anti-interference technologies.We made a classification of the common interference signals and analysed the application situations of the anti-interference technologies.2)We analysed the antenna array system model and the adapative space-domain anti-interference LMS(LCMV:Linearly Constrained Minimum Variance)algorithm.In addition,based on the LCMV algorithm we have come up with the improved algorithm(L1-LC-LMS).The anti-interference technologies can eliminate the narrow band interference signals in the receiving end of the communication systems.We made the matlab simulation and we analysed the algorithm convergence rate.YWhat's more,we made a research of the interference cancellation effect.We have compared algorithm performance of the newly proposed algorithm with the existing algorithm.3)The paper analysed other communication anti-interference algorithms such as Minimum Mean Square Error(MMSE)algorithm and Fast Block Least Mean Square(FBLMS)algorithm.4)We implemented the hardware simulation in FPGA about the Linearly Constrained Minimum Variance algorithm.We have designed the complete system structure to build a block design.We divide the whole hardware system into several modules according to the functions and finally we have completed the behavior simulation of every module.