Title :
A simple subspace-based blind channel estimation for OFDM systems
Author :
Gao, Feifei ; Nallanathan, A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore
Abstract :
In this paper, we consider the problem of blind channel estimation for single-input single-out (SISO) orthogonal frequency-division multiplexing (OFDM) systems via second order statistics (SOS) only. Based on the assumption that the transmitted symbols are independent and identically distributed (i.i.d), we develop a simple subspace based blind channel estimation technique by utilizing a non-redundant linear block precoding. The proposed method offers improved performance over the existing method using similar precoding technique. Additionally, the design criteria for the precoders by which the performance can be greatly improved is discussed, and the stochastic Cramer-Rao bound (CRB) is derived. The numerical results clearly show the effectiveness of our proposed algorithm
Keywords :
OFDM modulation; block codes; channel estimation; linear codes; precoding; statistical analysis; stochastic processes; OFDM systems; nonredundant linear block precoding; orthogonal frequency-division multiplexing; second order statistics; single-input single-out; stochastic Cramer-Rao bound; subspace-based blind channel estimation; Baseband; Blind equalizers; Channel estimation; Covariance matrix; Frequency division multiplexing; Frequency estimation; OFDM; Statistical distributions; Stochastic processes; Wireless communication;
Conference_Titel :
Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE
Conference_Location :
Las Vegas, NV
Print_ISBN :
1-4244-0269-7
Electronic_ISBN :
1525-3511
DOI :
10.1109/WCNC.2006.1696512
