2011 **Abstract:** In this article, design of preamble for channel estimation and pilot symbols for pilot-assisted channel estimation in orthogonal frequency division multiplexing system with null subcarriers is studied. Both the preambles and pilot symbols are designed to minimize the l 2 or the l ∞ norm of the channel estimate mean-squared errors (MSE) in frequency-selective environments. We use convex optimization technique to find optimal power distribution to the preamble by casting the MSE minimization problem into a semid…

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“…In the absence of the constraint for interference replica suppression, the problem in (18) above is efficiently solved in [11], where for a known set of subcarrier index (i.e., position) to be used as a preamble or pilot symbol, convex optimization techniques are employed to optimally distribute power to minimize the channel estimate MSE.…”

confidence: 99%

“…In the absence of the constraint for interference replica suppression, the problem in (18) above is efficiently solved in [11], where for a known set of subcarrier index (i.e., position) to be used as a preamble or pilot symbol, convex optimization techniques are employed to optimally distribute power to minimize the channel estimate MSE.…”

confidence: 99%

“…Common to all these techniques is that none of the proposed techniques achieves the minimum MSE of the channel estimate. Further, except for [1], [8], [14] - [15] these contributions do not take into account the presence of guard bands or null carriers.…”

confidence: 99%

“…Optimal pilot symbols for OFDM systems in the absence of null edge subcarriers are considered in [14][15][16] where equal distance and equal powered pilot symbols were found to be optimal with respect to several performance measures. However, in [10][11][12][13], it has been demonstrated that, http://asp.eurasipjournals.com/content/2013/1/51 for OFDM systems with null edge subcarriers equal distance and equal powered pilot symbols are not necessarily optimal.…”

confidence: 99%

“…In the literature, several pilot symbols designs for channel estimation have been predominantly developed for OFDM systems with and without null edge subcarriers (see [10][11][12][13][14][15][16], and the references therein). Optimal pilot symbols for OFDM systems in the absence of null edge subcarriers are considered in [14][15][16] where equal distance and equal powered pilot symbols were found to be optimal with respect to several performance measures.…”

confidence: 99%