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In this paper, we propose a novel pilot-aided joint channel and carrier frequency offset (CFO) estimation method for orthogonal frequency-division multiple access (OFDMA) uplink systems with users operating in time- and frequency-selective (doubly selective) fading environments. We use Bernstein basis polynomials (BBPs) to capture rapid time variations of the channel, which avoids the identifiability...
This paper proposes a new iterative channel estimation algorithm for known symbol padding (KSP) orthogonal frequency division multiplexing (OFDM) based on the Expectation Maximization (EM) algorithm . The guard interval is filled with pilot symbols and the remaining part of the pilot symbols is put on some of the OFDM carriers. To start up the EM algorithm an initial channel estimate is obtained by...
In this paper, we propose a joint carrier frequency offset (CFO) and channel estimation scheme based on the well known variable projection (VP) method for the uplink channel of orthogonal frequency division multiplexing (OFDM) systems. The CFOs and channel coefficients are estimated by minimizing the least-squares (LS) cost function through a numerical optimization technique. In each iteration, the...
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