常規(guī)通信信號調(diào)制識別系統(tǒng)的設(shè)計與硬件實現(xiàn)
[Abstract]:Modulation type is an important characteristic of communication signal. With the development of wireless communication technology, modulation type is becoming more and more complex. The traditional manual modulation recognition technology can not meet the actual needs. Automatic modulation recognition using DSP,FPGA and software radio technology has become a trend. Automatic modulation recognition technology is widely used in ship electromagnetic interference monitoring, radio monitoring and other fields. The basic principle of modulation parameter estimation and modulation recognition of communication signal is studied in this paper. This paper presents a modulation recognition algorithm based on instantaneous statistical features and decision tree classifier for nine kinds of modulation signals, 2ASK / 4ASK / 2FSKC / 4FSKK / 2PSK / AMK / FM / USB, which are based on instantaneous statistical features and decision tree classifier. Compared with the previous algorithms, the advantage of this algorithm is that it can meet the needs of fast hardware implementation, less sampling points, and suitable for random symbol conditions. The recognition algorithm uses a new centralization parameter to improve the recognition effect of {2ASK _ 4ASK} and {2FSKN _ 4FSK}. A threshold automatic adjustment algorithm is used to estimate the SNR by selecting the reference parameters of SNR. The decision threshold can be adjusted automatically and the adaptability of the recognition algorithm to SNR is improved. Compared with many previous algorithms, this algorithm is still effective in the case of unknown carrier frequency. The high accuracy carrier frequency estimation algorithm CZT transform is used to obtain the carrier frequency of the signal to satisfy the precision requirement of extracting nonlinear phase. The MATLAB simulation shows that the proposed algorithm is effective under the condition that the sampling point is 1024 (16 random symbols) and the carrier frequency is unknown. The average recognition accuracy is 93.27 when the SNR is not less than 10dB, and 99.0 when SNR is not less than 15dB. The hardware platform of modulation recognition based on DSP FPGA structure is designed. The schematic diagram of hardware circuit and the design of PCB are completed. Signal Integrity Analysis of DSP Board (SI), completes the SI simulation of part of the circuit using SigXploer to ensure the stability and reliability of the hardware circuit, and completes the debugging of the hardware platform. The C language program of the recognition algorithm is simulated on the CCS platform, and the recognition rate of the recognition algorithm is calculated. Finally, the designed hardware platform is used to identify the five modulation signals produced by the signal generator in real time, and the desired results are achieved.
【學(xué)位授予單位】:哈爾濱工程大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN911.3
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