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Wireless Communications and Mobile Computing
Volume 2018, Article ID 3981048, 11 pages
Research Article

Low Complexity Pilot Allocation Scheme for a Large OFDM Block with Null Subcarriers

1Department of Electrical and Electronics Engineering, Konkuk University, Seoul, Republic of Korea
2Department of Computer Engineering, Sejong University, Seoul, Republic of Korea
3Department of Electronics, Information and Communication Engineering, Sejong University, Seoul, Republic of Korea

Correspondence should be addressed to Eunchul Yoon;

Received 25 December 2017; Revised 25 February 2018; Accepted 4 March 2018; Published 10 April 2018

Academic Editor: Donatella Darsena

Copyright © 2018 Janghyun Kim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A low complexity pilot allocation scheme is proposed for a large OFDM block with null subcarriers. The proposed scheme allocates pilots to the edge part of the active subcarrier region according to the 2nd order polynomial and to the middle part of the active subcarrier region according to the 1st order polynomial or the comb-type pilot pattern. To find a parameter of the 2nd order polynomial, the proposed scheme applies exhaustive search of a single parameter by using an integer unit resolution. It is shown by simulation that the proposed scheme is a close-to-optimal pilot allocation scheme yielding better symbol error rate (SER) performance than the traditional 3rd and 5th order polynomial-based schemes although the proposed scheme has lower computation and implementation complexity.