Design method of 4-channel single-bit digital receiver and its receiver

Abstract

The invention discloses a design method of a 4-channel single-bit digital receiver and the receiver thereof. The method includes: performing single-bit sampling on the signal to obtain a single-bit digital signal, and analyzing the single-bit digital signal in the Nyquist sampling frequency band 4 frequency bands without the target harmonic components are acquired based on the harmonic characteristics within; a 4-channel single-bit digital receiver model is designed according to the 4 frequency bands without the target harmonic components; according to the 4-channel single-bit digital receiver model and preset The test parameters are simulated and tested to obtain the test results. The present invention can effectively avoid high-order harmonics through the design of special frequency bands, can effectively improve the spurious-free dynamic range of single-bit digital signals in each channel, and is beneficial to improving the instantaneous dynamic range of the receiver and enhancing the real-time processing of the receiver ability, and the designed 4-channel single-bit digital receiver has the advantages of simple structure, strong anti-noise ability and high instantaneous dynamic range.

Description

technical field [0001] The invention belongs to the technical field of digital receivers, and in particular relates to a design method of a 4-channel single-bit digital receiver and the receiver thereof. Background technique [0002] In order to apply to various complex conditions, modern radar signal detection requires a high-performance instantaneous frequency measurement receiver with low cost, small size, ultra-high response speed, large instantaneous broadband and the ability to process multiple signals at the same time, single-bit digital reception The machine can replace the traditional frequency measuring receiver to a certain extent and can meet the above requirements. The main advantage of the single-bit digital receiver is that the hardware structure is simple and the calculation of the discrete Fourier transform (DFT) does not require multiplication, which can quickly process broadband signals and save resources. However, the instantaneous dynamic range of the si...

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Problems solved by technology

For example, "Design and Performance Evaluation of a 2.5-GSPS Digital Receiver, Chien-In Henry Chen, IEEE Transactions on Instrumentation and Measurement, 2005, 54(3)" (a design and performance evaluation of a 2.5-GSPS digital receiver, Chien -InHenry Chen, IEEE Transactions on Instrumentation and Measurement, 2005, Volume 54, Issue 3), which proposed a digital receiver with a sampling rate of 2.5GHz using a combination of a 4-bit digital-to-analog converter (ADC) and a 12-point kernel function machine, by increasing the number of ADC bits and improving the kernel function of Fourier transform to improve the instantaneous dynamic range of the receiver, and at the same time, a compensation matrix method is proposed to suppress the harmonics, and further optimize the instantaneous dynamic range of the receiver, but the method has shortcomings There are: 1) Although the multiplication operation in the FFT calculation process can be avoided by simplifying the number of bits of the kernel function, since the number of bits of the ADC is increased to 4 bits, compared with the single-bit sampling digital receiver, the receiver designed in this paper There is still the problem of increased computational complexity, which increases power consumption and computational resources; 2) Using the compensation matrix method to suppress harmonics will lead to poor real-time performance of the frequency measurement receiver designed in this paper, and requires a large amount of storage resources, in addition, the use of the compensation matrix method has high requirements for frequency measurement accuracy. If the frequency measurement accuracy is improved only by increasing the scale of FFT, the resources to be consumed will increase exponentially, and the current programmable chips cannot meet the requirements; and If the super-resolution estimation algorithm proposed in this article is used to improve the frequency measurement accuracy, the suppression effect on harmonics is poor at low signal-to-noise ratios, and even new harmonics will be generated; 3) the current low-bit ADC The sampling rate has reached several or even ten times the sampling rate of the 4-bit ADC used in this article. From 2), it can be seen that the compensation matrix method used in this article is no longer applicable at high sampling rates

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