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| Finite-Alphabet and Decision-Feedback Based Channel Estimation for Space-Time Coded OFDM Systems |
| Chen Zhi-gang; Zhang Tai-yi; Gong Zheng-wei |
| School of Electronics and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China |
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Abstract A novel blind channel estimation scheme is presented for Space-Time Coded OFDM (STC-OFDM) systems. This scheme is composed of rude channel estimation by exploiting the finite-alphabet property of information signals and fine channel estimation by using decision-directed method, which employs the priori knowledge of the transmitted signals other than the finite-alphabet property of mapping constellation. At the cost of a little more computational complexity, it achieves better performance than the competitive one, hence it is suitable for STC-OFDM systems with a small number of subcarriers in slowly time-varying and not severely frequency selective channels. The scheme is tested with simulations and also compared with the subspace-based channel estimation.
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Received: 28 July 2006
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2008, Vol. 30 
