Pilot-aided OFDM channel estimation in the presence of the guard band

Seongwook Song; Andrew C. Singer

doi:10.1109/TCOMM.2007.902526

Pilot-aided OFDM channel estimation in the presence of the guard band

Research output: Contribution to journal › Article › peer-review

Abstract

In this letter, pilot design and channel estimation are discussed for orthogonal frequency-division multiplexing (OFDM) systems with guard subcarriers. First, we investigate the effects of guard band on channel estimation errors. From this, we propose pilot placement having a maximum distance between adjacent pilots except for the guard band, and show that it achieves minimum channel estimation errors among partially equispaced pilots using equivalence of the Toeplitz and circulant matrices. Also, an efficient channel estimator is developed by introducing an extended channel and its finite impulse response (FIR) approximation to overcome high numerical complexity caused by the presence of guard subcarriers and the use of a large number of subcarriers. Simulation results are presented for OFDM and orthogonal frequency division multiple access (OFDMA) systems consistent with IEEE 802.16a standards.

Original language	English (US)
Pages (from-to)	1459-1465
Number of pages	7
Journal	IEEE Transactions on Communications
Volume	55
Issue number	8
DOIs	https://doi.org/10.1109/TCOMM.2007.902526
State	Published - Aug 2007

Keywords

Channel estimation
Orthogonal frequency division multiple access (OFDMA)
Orthogonal frequency-division multiplexing (OFDM)
Pilot design

ASJC Scopus subject areas

Electrical and Electronic Engineering

Online availability

10.1109/TCOMM.2007.902526

Library availability

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abstract = "In this letter, pilot design and channel estimation are discussed for orthogonal frequency-division multiplexing (OFDM) systems with guard subcarriers. First, we investigate the effects of guard band on channel estimation errors. From this, we propose pilot placement having a maximum distance between adjacent pilots except for the guard band, and show that it achieves minimum channel estimation errors among partially equispaced pilots using equivalence of the Toeplitz and circulant matrices. Also, an efficient channel estimator is developed by introducing an extended channel and its finite impulse response (FIR) approximation to overcome high numerical complexity caused by the presence of guard subcarriers and the use of a large number of subcarriers. Simulation results are presented for OFDM and orthogonal frequency division multiple access (OFDMA) systems consistent with IEEE 802.16a standards.",

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Pilot-aided OFDM channel estimation in the presence of the guard band

Abstract

Keywords

ASJC Scopus subject areas

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