MIMO-OFDM Channel Estimation in the Presence of Carrier Frequency Offset

• Main Authors: Li Jun, Liao Guisheng, Guo Qinghua
• Format: Article
• Language: English
• Published: SpringerOpen 2005-01-01
• Series: EURASIP Journal on Advances in Signal Processing
• Subjects: MIMO-OFDM; CFO estimation; channel estimation; CRB; ML
• Online Access: http://dx.doi.org/10.1155/ASP.2005.525

<p/> <p>A multiple-input multiple-output (MIMO) wireless communication system with orthogonal frequency division multiplexing (OFDM) is expected to be a promising scheme. However, the estimation of the carrier frequency offset (CFO) and the channel parameters is a great challenging task. In this paper, a maximum-likelihood- (ML-) based algorithm is proposed to jointly estimate the frequency-selective channels and the CFO in MIMO-OFDM by using a block-type pilot. The proposed algorithm is capable of dealing with the CFO range nearly <inline-formula><graphic file="1687-6180-2005-928346-i1.gif"/></inline-formula> useful OFDM signal bandwidth. Furthermore, the cases with timing error and unknown channel order are discussed. The Cram&#233;r-Rao bound (CRB) for the problem is developed to evaluate the performance of the algorithm. Computer simulations show that the proposed algorithm can exploit the gain from multiantenna to improve effectively the estimation performance and achieve the CRB in high signal-to-noise ratio (SNR).</p>