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LMMSE algorithm is one of the best linear channel estimations for time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) system. The research on the computational complexity reduction of LMMSE algorithm remains to be a challenging topic. Since the combination of fast Fourier transform with singular value decomposition (FFT-SVD) simplify the channel autocorrelation matrix computation...
Basis expansion model (BEM) based estimation is studied for highly time varying OFDMA uplink channel. We consider two popular pilot patterns-pilot placed over frequency-time grid as proposed in IEEE 802.16e standard and pilot placed on the time axis. In a high Doppler spread scenario, taking intercarrier interference (ICI) impact from data block into account, least square (LS) estimator is developed...
This paper presents an efficient channel estimation scheme for multi-band orthogonal frequency division multiplexing based ultra-wideband communications. The scheme is based on a simple least-square (LS) algorithm, but enhanced with channel frequency response aided decision-directed detection as well as frequency-domain smoothing. The mean-squared error performance and computational complexity of...
OFDM modulation combines the advantages of high achievable rates and relatively easy implementation. However, for proper recovery of the input, the OFDM receiver needs accurate channel information. Most algorithms proposed in literature perform channel estimation in the time domain which increases the computational complexity in multiaccess situations where the user is only interested in part of the...
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