Comparison of Jamming Excision Methods for Direct Sequence/spread Spectrum (ds/ss) Modulated Signal

Direct Sequence/Spread-Spectrum (DSSS) signals are characterized by a wide bandwidth and a low-power spectral density. These characteristics make them very robust with respect to the jamming. The Jamming represents one of the main concerns for secure communication and communication in a crowded spectrum. When the jamming to signal power ratio is greater than the Process Gain, even the use of DSSS signals requires the introduction of mitigation techniques. Common anti-jamming systems are based on adaptive filters. However, this solution presents several disadvantages, as the inefficiency to mitigate multi-tone jamming and nonstationary jamming. For these reasons, great interest is toward the development of anti-jamming systems based on different techniques as the Wavelet Transform and the Filters bank. This paper has two objectives. The first one regards the evaluation of the parameter choice on the jamming excision performance. The second objective is to compare the performance obtainable by the two above techniques. Experiments for parameter evaluation and performance comparison are carried out using MATLAB simulations. These simulations were performed using the most common jamming types.