Self interference cancellation for bandwidth optimization on satellite communications

In this paper, a novel self-interference cancellation receiver is proposed to maximize the spectrum utilization for satellite communications. To the best of our knowledge, the proposed system is the first system that performs self-interference cancellation without the estimation of the signal parameters (frequency, phase, and gain offsets) and without the generation of the self-interfering signal. Correlation Receiver is used for the demodulation process followed by a subtracter to cancel the self-interfering in-phase and quadrature phase components at each earth station of a two way Very Small Aperture Terminal (VSAT) satellite communication link. The proposed technique achieves more than 50% saving of the bandwidth of the space segment over the traditional transmission. Simulation results show that the receiver performance in terms of Bit Error Rate (BER) versus the signal to noise ratio (SNR) at the Maximum Likelihood (ML) detector output of each link is almost the same as the case of using two different transmit frequencies. Besides to the reliable performance, the proposed method simplifies the receiver at each earth station.