Research on Narrowband Co-channel Interference Detection Based on Spectrum Jump Analysis

Under interference-free conditions, spectral analysis shows that the FFT bin index corresponding to the carrier center frequency remains within the range of 257 to 258, and exhibits stable variation trends with FFT iteration count (X-axis). Notably, the second peak frequency index maintains strict consistency with either the first or third peak frequency index, with no abrupt jumps or periodic oscillations observed.When co-channel interference is present, although the FFT bin index of the carrier center frequency still distributes between 257 and 258, its dynamic characteristics exhibit significant alterations.