IEEE Wireless Communications and Networking Conference 17 (WCNC)
Abstract
In spectrally efficient frequency division
multiplexing (SEFDM) systems, the subcarrier spacing is
compressed, below the orthogonality limit, by a factor (1-α), where
α ≤ 1. In such systems, inter-carrier interference (ICI) is generated
between the subcarriers due to the lack of orthogonality and the
received pilot symbols are affected by ICI, thus preventing the
receiver from correctly estimating the channel. Considering the
deterministic nature of the induced ICI, in this paper a new
SEFDM frequency-domain channel estimation method is
proposed that decouples the ICI from the channel. The ICI is first
found analytically at the receiver using an FFT. This information
is then used to estimate the channel characteristics based on
received pilot symbols. We show that for various values of α, the
proposed method offers similar performance to time-domain
methods, with reduced computational complexity, due to the use
of an FFT instead of matrix inversion
