A Channelized Transmit Structure of FPGA-Based Narrow Transition Band Filter Bank

Abstract

The invention relates to the technical field of digital communication and radar, and in particular to a channelized transmitting structure of a filter bank with a narrow transition zone based on an FPGA. The transmitting comprises: a DDS module generates different kinds of signals; performing complex multiplication on the signals, and inputting the signals to an IFFT module for transformation; inputting the output data to shielding filters HMa, k-1(z) and HMC, k-1(z) which are in multi-phase structures for filtering, wherein k=1, 2, . . . , K; performing K-fold interpolation and delay addition; outputting results through interpolation filters Ha(zL) and Hc(zL) of upper and lower branches. The channelized transmitting structure of a filter bank with a narrow transition zone based on an FPGAcan be obtained through the frequency response shielding technology, and has lower computational complexity, so that the consumption of hardware multiplier resources in the FPGA is reduced, and engineering implementation is easy.

Description

technical field [0001] The invention relates to the technical fields of digital communication and radar, in particular to a channelized transmitting structure of an FPGA-based narrow transition band filter bank. Background technique [0002] With the continuous development of related industries in the electronic field such as wireless digital communications, the design of transmitters has also undergone great development. Channelized transmitters can simultaneously transmit multiple signals of different types and different frequency bands, solving the problem of traditional transmitter Multiple transmitters are required to form a transmitter matrix to transmit multiple signals. It can not only modulate and transmit multiple channels of signals with different carriers, different modulation styles, and different bandwidths at the same time, but also can achieve full-channel transmission, and has high computing efficiency, strong real-time processing capabilities, and simple st...

AI Technical Summary

Problems solved by technology

[0003] Since the design of the prototype filter filter bank is often involved in the channelized transmitter, if the transition band of the filter is designed to be wide, when the signal is at the junction of adjacent channels, the signal will often be severely distorted and the spectrum utilization will be greatly reduced. The rate is also greatly reduced, and it is difficult to judge the specific channel where the signal is located.

If the filter transition band is designed to be too narrow, in Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA), the implementation of the narrow transition band filter will make the filter order too high, and consume huge hardware resources. Even lead to insufficient FPGA resources

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