The Shortwave Frequency Hopping Communication System And Fpga Implementation

Short-wave communication system have an important place in the military strategic communications and tactical communications,because it's low power consumption, system equipment, low cost, mature technology and easily development and so on.This paper mainly study the algorithms of short-wave relevanted frequency-hopping communication systems and Realizing of this systems based on FPGA. Paper's content have the study of short-wave communication systems,the improved algorithms of relevant frequency-hopping, the realised of system's sending and receiving ends.The design simulation prove the right design of the system.Based on the study of the algorithms of relevanted frequency-hopping,This paper propose the improved algorithms which the current frequency decide by the last-front hop-frequency,information data,and the M-sequence.Based on the study of the algorithms of relevanted frequency-hopping,This paper propose the improved algorithms which the current frequency decide by the last-front hop-frequency,information data,and the M-sequence.This paper detailly analysis the process of the improved algorithms,and prove it's correct from the theoretical.Using the Matlab analysis the performance of the fixed control parameters of algorithm, the vary control parameters of algorithm, and the improvement algorithm. According to the designed rule of software radio and features of the system, carry out the composition of the short-wave interrelated frequency hopping system based on FPGA, and Programe the positive and inverse transform module of improved algorithm, the generated module of short-wave signal,and the frequency domain transform and frequency recognition module. For the existing flaw of asynchronous demodulation, this paper propose an interference suppression scheme based on time domain characteristics.