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ABSTRACT In this paper, we investigate the effect of feedback delay on a dual-hop fixed gain amplify-and-forward relay network over Rayleigh-Rician mixed fading channels, where the source and destination are all equipped with multiple antennas, while the relay has a single antenna. By using the model of beamforming with feedback delay, the equivalent output signal-to-noise ratio (SNR) of the amplify-and-forward relay network is first obtained. Then, based on the infinite series representation, the analytical expressions for the outage probability and the probability density function of the output SNR are derived. Furthermore, the analytical formulas of the ergodic capacity and the average symbol error rate formulas with various modulation formats are developed. To reveal the diversity order and array gain of the multi-antenna relay network, the asymptotic average symbol error rates at high SNR are also presented. Finally, computer simulations are provided to validate the theoretical analysis and to indicate the effect of antenna number, feedback delay and channel parameters on the system performance. Copyright © 2013 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

In a strong interference environment, considering the data spilling of the Analog to Digital Converter(ADC) in satellite digital channelizer will severely degrades the system performance. This paper proposes a method of strong interference suppression for broadband satellite communication. Firstly, strong interference detection, extrication, and phase amplitude adjustment techniques are adopted in digital field. Then, the strong interference cancellation is performed in the analog field. Finally, the cancellation effect is confirmed by employing detection feedback. The design approaches and implementation procedures for the extraction filter in digital field are provided. Moreover, according to engineering practice, a filtering method based on mathematical morphology is presented to eliminate the effects caused by noise floor fluctuation in broadband satellite communication. Theoretical investigation and simulation results demonstrate that the proposed method can suppress the strong interference effectively. [ABSTRACT FROM AUTHOR]