Zynq-based multichannel AM and FM demodulation method

Abstract

The invention discloses a Zynq-based multichannel AM and FM demodulation method. The method comprises the following steps of command issuing and data collection, digital down conversion and AM demodulation or FM demodulation. Four demodulation channels are provided, and AM / FM modulation signals in four channels can be demodulated at the same time. As digital down conversion and signal demodulation which require a large amount of logic resources are put in an FPGA for operation, the FPGA has a parallel processing capability and provides special DSP resources, the demodulation data rate for the FPGA is theoretically only limited by the clock rate of the FPGA (Zynq can reach 300 MHz or above), and as the FPGA has the parallel processing capability, the signal precision (data bit width) is improved as much as possible when digital down conversion and demodulation are carried out, the FPGA operation speed is not influenced in a condition in which the resources are met, and real-time processing of multichannel signals can be met completely.

Description

technical field [0001] The invention relates to the technical field of digital receiver demodulation, in particular to a Zynq-based multi-channel AM and FM demodulation method. Background technique [0002] AM and FM demodulation is an essential function of digital receivers, and the data bit width (precision) in the demodulation process will directly affect the demodulation quality and resource occupancy; the demodulation method of existing receivers is mainly through FPGA Collect the signal to obtain the I / Q component, then transmit the I / Q component to the computer, and demodulate it through software, that is, adopt the "FPGA+computer" architecture. In order to obtain higher demodulation accuracy, the bit width of I / Q data should be increased as much as possible, and the increase of bit width will increase the computer resource occupation rapidly, resulting in a sharp drop in CPU processing speed, which will cause the computer to fail to meet the needs of other applicatio...

AI Technical Summary

Problems solved by technology

In order to obtain higher demodulation accuracy, the bit width of I / Q data should be increased as much as possible, and the increase of bit width will increase the computer resource occupation rapidly, resulting in a sharp drop in CPU processing speed, which will cause the computer to fail to meet the needs of other applications

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