Channel estimation for OFDM systems based on a time domain pilot averaging scheme

Spiridon Zettas, Stylianos Kasampalis, Pavlos Lazaridis, Zaharias D. Zaharis, John Cosmas

Research output: Contribution to journalConference article

6 Citations (Scopus)

Abstract

In modern wireless communications there is an increasing need for higher data rates. Modern Digital TV (DTV), like Digital Video Broadcasting Terrestrial (DVB-TIT2), DVB Handheld (DVB-H), Digital Audio Broadcasting (DAB), 4 th Generation (4G) mobile telephony known as Long Term Evolution (L TE) and IEEE 802.11a/b/g/n for wireless LAN (WLAN) are typical applications where high data rates are needed. The adaptation of Orthogonal Division Multiplexing (OFDM), which is a multicarrier modulation, helped to achieve high data rates while the transmission system became more robust against multipath fading, which traditional single carrier systems failed to handle effectively. The OFDM system divides the available bandwidth into a large number of narrow band sub-channels, which have their own respective subcarrier and each one of them can considered as a flat fading channel. In order to have reliable reception of the transmitted data, the knowledge of the channel impulse response is important. In this paper we are focusing on pilot aided channel estimation. A novel channel estimator is proposed to eliminate multipath and noise effects assuming Additive White Gaussian Noise (A WGN) and considering that the channel suffers only from slow fading effects. In this case, the channel can be considered to be invariant in time over an interval of the few last OFDM received symbols. Averaging over the last received OFDM symbols leads to reduced noise at the receiver. The benefits of the proposed estimator are its very simple implementation, its good performance for slowly time-varying channels and its application in devices with limited available memory and computational capabilities. In addition, it can be used for battery saving in handheld devices, due to the reduced complexity.

LanguageEnglish
Article number6618612
JournalInternational Symposium on Wireless Personal Multimedia Communications, WPMC
Publication statusPublished - 3 Oct 2013
Externally publishedYes
Event16th International Symposium on Wireless Personal Multimedia Communications: Co-Located with Global Wireless Summit - Atlantic City, United States
Duration: 24 Jun 201327 Jun 2013
Conference number: 16

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Channel estimation
Orthogonal frequency division multiplexing
Digital video broadcasting (DVB)
Digital radio
Long Term Evolution (LTE)
Multipath fading
Multicarrier modulation
Impulse response
Multiplexing
Local area networks
Fading channels
Bandwidth
Data storage equipment
Communication

Cite this

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title = "Channel estimation for OFDM systems based on a time domain pilot averaging scheme",
abstract = "In modern wireless communications there is an increasing need for higher data rates. Modern Digital TV (DTV), like Digital Video Broadcasting Terrestrial (DVB-TIT2), DVB Handheld (DVB-H), Digital Audio Broadcasting (DAB), 4 th Generation (4G) mobile telephony known as Long Term Evolution (L TE) and IEEE 802.11a/b/g/n for wireless LAN (WLAN) are typical applications where high data rates are needed. The adaptation of Orthogonal Division Multiplexing (OFDM), which is a multicarrier modulation, helped to achieve high data rates while the transmission system became more robust against multipath fading, which traditional single carrier systems failed to handle effectively. The OFDM system divides the available bandwidth into a large number of narrow band sub-channels, which have their own respective subcarrier and each one of them can considered as a flat fading channel. In order to have reliable reception of the transmitted data, the knowledge of the channel impulse response is important. In this paper we are focusing on pilot aided channel estimation. A novel channel estimator is proposed to eliminate multipath and noise effects assuming Additive White Gaussian Noise (A WGN) and considering that the channel suffers only from slow fading effects. In this case, the channel can be considered to be invariant in time over an interval of the few last OFDM received symbols. Averaging over the last received OFDM symbols leads to reduced noise at the receiver. The benefits of the proposed estimator are its very simple implementation, its good performance for slowly time-varying channels and its application in devices with limited available memory and computational capabilities. In addition, it can be used for battery saving in handheld devices, due to the reduced complexity.",
keywords = "Average, channel estimation, DVB-T/T2/H, equalization, OFDM, pilots",
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year = "2013",
month = "10",
day = "3",
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Channel estimation for OFDM systems based on a time domain pilot averaging scheme. / Zettas, Spiridon; Kasampalis, Stylianos; Lazaridis, Pavlos; Zaharis, Zaharias D.; Cosmas, John.

In: International Symposium on Wireless Personal Multimedia Communications, WPMC, 03.10.2013.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Channel estimation for OFDM systems based on a time domain pilot averaging scheme

AU - Zettas, Spiridon

AU - Kasampalis, Stylianos

AU - Lazaridis, Pavlos

AU - Zaharis, Zaharias D.

AU - Cosmas, John

PY - 2013/10/3

Y1 - 2013/10/3

N2 - In modern wireless communications there is an increasing need for higher data rates. Modern Digital TV (DTV), like Digital Video Broadcasting Terrestrial (DVB-TIT2), DVB Handheld (DVB-H), Digital Audio Broadcasting (DAB), 4 th Generation (4G) mobile telephony known as Long Term Evolution (L TE) and IEEE 802.11a/b/g/n for wireless LAN (WLAN) are typical applications where high data rates are needed. The adaptation of Orthogonal Division Multiplexing (OFDM), which is a multicarrier modulation, helped to achieve high data rates while the transmission system became more robust against multipath fading, which traditional single carrier systems failed to handle effectively. The OFDM system divides the available bandwidth into a large number of narrow band sub-channels, which have their own respective subcarrier and each one of them can considered as a flat fading channel. In order to have reliable reception of the transmitted data, the knowledge of the channel impulse response is important. In this paper we are focusing on pilot aided channel estimation. A novel channel estimator is proposed to eliminate multipath and noise effects assuming Additive White Gaussian Noise (A WGN) and considering that the channel suffers only from slow fading effects. In this case, the channel can be considered to be invariant in time over an interval of the few last OFDM received symbols. Averaging over the last received OFDM symbols leads to reduced noise at the receiver. The benefits of the proposed estimator are its very simple implementation, its good performance for slowly time-varying channels and its application in devices with limited available memory and computational capabilities. In addition, it can be used for battery saving in handheld devices, due to the reduced complexity.

AB - In modern wireless communications there is an increasing need for higher data rates. Modern Digital TV (DTV), like Digital Video Broadcasting Terrestrial (DVB-TIT2), DVB Handheld (DVB-H), Digital Audio Broadcasting (DAB), 4 th Generation (4G) mobile telephony known as Long Term Evolution (L TE) and IEEE 802.11a/b/g/n for wireless LAN (WLAN) are typical applications where high data rates are needed. The adaptation of Orthogonal Division Multiplexing (OFDM), which is a multicarrier modulation, helped to achieve high data rates while the transmission system became more robust against multipath fading, which traditional single carrier systems failed to handle effectively. The OFDM system divides the available bandwidth into a large number of narrow band sub-channels, which have their own respective subcarrier and each one of them can considered as a flat fading channel. In order to have reliable reception of the transmitted data, the knowledge of the channel impulse response is important. In this paper we are focusing on pilot aided channel estimation. A novel channel estimator is proposed to eliminate multipath and noise effects assuming Additive White Gaussian Noise (A WGN) and considering that the channel suffers only from slow fading effects. In this case, the channel can be considered to be invariant in time over an interval of the few last OFDM received symbols. Averaging over the last received OFDM symbols leads to reduced noise at the receiver. The benefits of the proposed estimator are its very simple implementation, its good performance for slowly time-varying channels and its application in devices with limited available memory and computational capabilities. In addition, it can be used for battery saving in handheld devices, due to the reduced complexity.

KW - Average

KW - channel estimation

KW - DVB-T/T2/H

KW - equalization

KW - OFDM

KW - pilots

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UR - https://ieeexplore.ieee.org/abstract/document/6618612?section=abstract

UR - http://toc.proceedings.com/19541webtoc.pdf

M3 - Conference article

JO - International Symposium on Wireless Personal Multimedia Communications, WPMC

T2 - International Symposium on Wireless Personal Multimedia Communications, WPMC

JF - International Symposium on Wireless Personal Multimedia Communications, WPMC

SN - 1347-6890

M1 - 6618612

ER -