Citation
Hezam, Mohammed Abdo Saeed and Mohd Ali, Borhanuddin and Khatun, Sabira and Noordin, Nor Kamariah and Ismail, Mahamod
(2007)
MIMO OFDM channel estimation based on RLS algorithm: the time- versus frequency-domain implementations.
In: 2007 Asia-Pacific Conference on Communications, 18-20 Oct. 2007, Bangkok, Thailand. (pp. 547-550).
Abstract
In this paper, exponentially-weighted recursive least squared (EW-RLS) channel estimation for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is investigated. Channel estimation in time-domain (TD) as well as frequency-domain (FD) is investigated through exploiting preambles and pilot symbols inserted in TD and FD, respectively. The channel is assumed to be slowly time-varying frequency-selective, constant during one OFDM symbol but changing from symbol to symbol. Simulation results show that the TD EW-RLS estimator has better estimation performance in terms of the mean-squares error (MSE) and bit-error rate (BER), compared to FD EW-RLS estimation approach. The computational complexity is significantly reduced by recursively updating the channel estimates and by applying the matrix inversion lemma.
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