Title Design and Realization of an MSK Modem Based on FPGA _
Abstract In this dissertation, we design a MSK modem based on FPGA adopting the method of module on the grounds of the principle of digital signal MSK modulation and demodulation. In the modulation process, we use the NCO on the MSK signal modulation to get the consecutive MSK signal, and differential demodulation method are used on the modulation signal demodulation to get the demodulation signal. Then we use the FIR digital to complete the filtering. The VHDL Models are designed and simulated, on the simulation, a simple Matlab simulation of the MSK modulation and demodulation algorithm are introduced, focuses on the FPGA implementation of the MSK modulation and demodulation, then use the Modelsim simulation to correct the modem. The designed modem has the characteristics of small size, low consume, high integration, strong soft replant and high anti-interference, it is accordance with the direction of future communication technology design.
Keywords MSK Signal FPGA VHDL NCO Difference Demodulation