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In this paper, we develop a new nonmonotone Armijo-type line search for LS (Liu-Storey) conjugate gradient method for minimizing functions having Lipschitz continuous partial derivatives. The nonmonotone line search can guarantee the global convergence of original LS method under some mild conditions. AMS Subject Classification: 90C30, 65K05

The presence of residual carrier frequency offset (CFO) in an orthogonal frequency division multiplexing (OFDM) system leads to a loss of orthogonality between the subcarriers. This introduces inter-subcarrier interference and degrades the system performance significantly. In the literature, Liu and Tureli proposed a blind CFO estimation method based on the observation that in a typical OFDM sy...

Changchun Liu, Junchao Gao, and Songzhe Lian Department of Mathematics, Jilin University, Changchun 130012, China Correspondence should be addressed to Changchun Liu, [email protected] Received 31 October 2011; Accepted 6 December 2011 Academic Editor: Hui-Shen Shen Copyright q 2012 Changchun Liu et al. This is an open access article distributed under the Creative Commons Attribution License, wh...