Satellite MIMO digital beam-forming under nonlinear high-power amplifier and keyhole

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Goswami, Madhuprana
Kwon, Hyuck M.
Pham, Khanh D.
Lyke, James

M. Goswami, H. M. Kwon, K. Pham and J. Lyke, "Satellite MIMO Digital Beam-forming under Nonlinear High-Power Amplifier and Keyhole," 2019 International Conference on Computing, Networking and Communications (ICNC), Honolulu, HI, USA, 2019, pp. 313-317


In a satellite communication (Sat-Com) system, channel coefficients from multiple-input, multiple-output (MIMO) antennas are correlated strongly because of a long propagation distance and a narrow angle spread. This is referred to as a keyhole (KH) channel, which results in a rank deficiency in the MIMO channel and a reduction in the number of simultaneously supportable multiple-access users. In addition, a high-power amplifier (HPA) in a satellite transponder distorts the transmitted signal due to its nonlinearity and memory. The aim of this paper is to study a satellite beamforming (BF) method and to investigate its signal-to-interference-plus-noise ratio (SINR) degradation due to the KH and HPA nonlinearity effects. A closed form of an optimum BF vector is not available due to HPA nonlinearity and memory, and a BF vector with simple complexity is desirable in practice. Therefore, this paper proposes a satellite transponder that uses column vectors from a discrete Fourier transform (DFT) matrix as precoding BF vectors in order for multiple ground terminals to meet their SINR demands.

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