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Robust Channel Estimation for Broadband Satellite Communications

Balseiro, F. B. ; Souto, N.S.

Robust Channel Estimation for Broadband Satellite Communications, Proc Conf. on Telecommunications - ConfTele, Lisbon, Portugal, Vol. -, pp. - - -, April, 2011.

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Abstract
In this paper we study robust channel estimation
techniques for supporting broadband satellite communications in
OFDM (Orthogonal Frequency Division Multiplexing) based
systems. The study considers the use of QPSK (Quadrature
Phase-Shift Keying) digital modulation scheme. To achieve
reliable coherent detection two different pilot symbols
transmission methods are evaluated and compared: data
multiplexed pilots and implicit pilots. The method of implicit
pilots allows coherent detection at the receiver while avoiding
spectral degradation associated with the data multiplexed pilots’
technique but results in mutual interference between pilots and
data. Since the interference levels between data and pilots might
be very high, we propose an iterative receiver.