OFDM channel estimation performance under channels with a peak power constraint

Authors:
Benjamin Hamilton;Xiaoli Ma;John Kleider
Affiliations:
Georgia Institute of Technology, Atlanta, Georgia;Georgia Institute of Technology, Atlanta, Georgia;General Dynamics C4 Systems, Scottsdale, Arizona
Venue:
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
Year:
2009

Citing 3
Cited 1

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OFDM subcarrier interference cancellation for non-linear PA distortion

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Abstract

OFDM signals suffer significant distortion when transitted through practical power amplifiers. In this paper, we examine the channel estimation performance of OFDM systems under channels with such a peak power constraint. We consider the effects of null edge subcarriers added for spectral shaping and derive the Cramér-Rao bound for channel estimation performance of this system both with pilot power and position optimized for channel estimation, and with uniformly spaced pilots of uniform power. The effects of the peak limitation on both the channel estimation mean-squared error and the overall data symbol mean-squared error are analyzed through simulation. We show that the peak limitation significantly reduces channel estimation performance and demonstrate the existence of an optimal input backoff for channel estimation.