Research Of Polyphase Filtering Technology And Its Application In Multichannel Receiver

With the development and widespread application of multi-channel receiver,the structure and performance of multi-channel receiver are put forward higher requirements.Polyphase filter can receive signals with full probability,it can also reduce the sampling rate in order to facilitate the follow-up processing and increase the rate of system operation to save resources.The application of the polyphase filter technology to a multi-channel receiver can improve the system performance.In this thesis,the key technologies of multi-channel receivers are first studied.The structure of integer decimation,interpolator and fractional rate conversion is introduced in multi-rate processing technology,and the decimation structure combined with polyphase filter is deduced.In the channelization processing section,the advantages of the polyphase filter in the channelization process are proved by comparing the complexity of the algorithm,and a channelizer structure combining polyphase filter and FFT is deduced.Secondly,the specific scheme and simulation of polyphase filtering technology applied in multi-channel receiver are introduced.According to the design specifications,the design of each component structure is completed.The fractional rate conversion module is implemented by combining the equivalent network of polyphase filter interpolators and the switch circuit,which optimizes the traditional strucfture and avoids the circuitr working under high clock.This structure can also save more resources.For the non-base 2 FFT structure in the non-standard polyphase network,the Winograd Fourier transform algorithm is introduced.Through the simulation of each part,the feasibility of the scheme was verified.Finally,the implementation of ultra-short wave multi-channel receiver system in FPGA is introduced in detail,including the implementation of AD sampling circuit,orthogonal frequency down-conversion module,fractional multiple extraction module based on polyphase filter,polyphase filtering channelizer and the FFT structure in the non-standard polyphase network.And the estimate of resource consumption in the FPGA is given.