Performance Analysis of OFDM Interference Mitigation via Demodulation/Remodulation Estimation and Extraction

Increased demand for sub-6 GHz electromagnetic spectrum access has led to the development of new techniques for dynamic spectrum access. Additionally, proposed regulatory frameworks would allow for cooperative and non-cooperative sharing of spectrum resources. When multiple users coexist in a frequency band, there is a risk of interference between the users. This work presents an active cancellation technique that demodulates an interfering communications signal using known orthogonal frequency division multiplexing (OFDM) parameters. The method estimates the interference by demodulating the signal, extracting data bits, and remodulating the bits to create a signal to subtract from the radar return data. This work presents a simulation model and examines the interference power reduction achieved with a pulsed radar system that loses data by blanking its receiver on transmit. This work concludes with an analysis of range-Doppler processing applied after interference mitigation and presents the output constant false alarm rate (CFAR) detection statistics.