An EM Algorithm-Based Disintegrated Channel Estimator for OFDM AF Cooperative Relaying

Jeng-Shin SHEU; Wern-Ho SHEEN

doi:10.1587/transcom.E96.B.254

An EM Algorithm-Based Disintegrated Channel Estimator for OFDM AF Cooperative Relaying

Jeng-Shin SHEU, Wern-Ho SHEEN

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The cooperative orthogonal frequency-division multiplexing (OFDM) relaying system is widely regarded as a key design for future broadband mobile cellular systems. This paper focuses on channel estimation in such a system that uses amplify-and-forward (AF) as the relaying strategy. In the cooperative AF relaying, the destination requires the individual (disintegrated) channel state information (CSI) of the source-relay (S-R) and relay-destination (R-D) links for optimum combination of the signals received from source and relay. Traditionally, the disintegrated CSIs are obtained with two channel estimators: one at the relay and the other at the destination. That is, the CSI of the S-R link is estimated at relay and passed to destination, and the CSI of the R-D link is estimated at destination with the help of pilot symbols transmitted by relay. In this paper, a new disintegrated channel estimator is proposed; based on an expectation-maximization (EM) algorithm, the disintegrated CSIs can be estimated solely by the estimator at destination. Therefore, the new method requires neither signaling overhead for passing the CSI of the S-R link to destination nor pilot symbols for the estimation of the R-D link. Computer simulations show that the proposed estimator works well under the signal-to-noise ratios of interest.

Publication: IEICE TRANSACTIONS on Communications Vol.E96-B No.1 pp.254-262

Publication Date: 2013/01/01

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Online ISSN: 1745-1345

DOI: 10.1587/transcom.E96.B.254

Type of Manuscript: PAPER

Category: Wireless Communication Technologies

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Jeng-Shin SHEU, Wern-Ho SHEEN, "An EM Algorithm-Based Disintegrated Channel Estimator for OFDM AF Cooperative Relaying" in IEICE TRANSACTIONS on Communications, vol. E96-B, no. 1, pp. 254-262, January 2013, doi: 10.1587/transcom.E96.B.254.
Abstract: The cooperative orthogonal frequency-division multiplexing (OFDM) relaying system is widely regarded as a key design for future broadband mobile cellular systems. This paper focuses on channel estimation in such a system that uses amplify-and-forward (AF) as the relaying strategy. In the cooperative AF relaying, the destination requires the individual (disintegrated) channel state information (CSI) of the source-relay (S-R) and relay-destination (R-D) links for optimum combination of the signals received from source and relay. Traditionally, the disintegrated CSIs are obtained with two channel estimators: one at the relay and the other at the destination. That is, the CSI of the S-R link is estimated at relay and passed to destination, and the CSI of the R-D link is estimated at destination with the help of pilot symbols transmitted by relay. In this paper, a new disintegrated channel estimator is proposed; based on an expectation-maximization (EM) algorithm, the disintegrated CSIs can be estimated solely by the estimator at destination. Therefore, the new method requires neither signaling overhead for passing the CSI of the S-R link to destination nor pilot symbols for the estimation of the R-D link. Computer simulations show that the proposed estimator works well under the signal-to-noise ratios of interest.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E96.B.254/_p

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@ARTICLE{e96-b_1_254,
author={Jeng-Shin SHEU, Wern-Ho SHEEN, },
journal={IEICE TRANSACTIONS on Communications},
title={An EM Algorithm-Based Disintegrated Channel Estimator for OFDM AF Cooperative Relaying},
year={2013},
volume={E96-B},
number={1},
pages={254-262},
abstract={The cooperative orthogonal frequency-division multiplexing (OFDM) relaying system is widely regarded as a key design for future broadband mobile cellular systems. This paper focuses on channel estimation in such a system that uses amplify-and-forward (AF) as the relaying strategy. In the cooperative AF relaying, the destination requires the individual (disintegrated) channel state information (CSI) of the source-relay (S-R) and relay-destination (R-D) links for optimum combination of the signals received from source and relay. Traditionally, the disintegrated CSIs are obtained with two channel estimators: one at the relay and the other at the destination. That is, the CSI of the S-R link is estimated at relay and passed to destination, and the CSI of the R-D link is estimated at destination with the help of pilot symbols transmitted by relay. In this paper, a new disintegrated channel estimator is proposed; based on an expectation-maximization (EM) algorithm, the disintegrated CSIs can be estimated solely by the estimator at destination. Therefore, the new method requires neither signaling overhead for passing the CSI of the S-R link to destination nor pilot symbols for the estimation of the R-D link. Computer simulations show that the proposed estimator works well under the signal-to-noise ratios of interest.},
keywords={},
doi={10.1587/transcom.E96.B.254},
ISSN={1745-1345},
month={January},}

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TY - JOUR
TI - An EM Algorithm-Based Disintegrated Channel Estimator for OFDM AF Cooperative Relaying
T2 - IEICE TRANSACTIONS on Communications
SP - 254
EP - 262
AU - Jeng-Shin SHEU
AU - Wern-Ho SHEEN
PY - 2013
DO - 10.1587/transcom.E96.B.254
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E96-B
IS - 1
JA - IEICE TRANSACTIONS on Communications
Y1 - January 2013
AB - The cooperative orthogonal frequency-division multiplexing (OFDM) relaying system is widely regarded as a key design for future broadband mobile cellular systems. This paper focuses on channel estimation in such a system that uses amplify-and-forward (AF) as the relaying strategy. In the cooperative AF relaying, the destination requires the individual (disintegrated) channel state information (CSI) of the source-relay (S-R) and relay-destination (R-D) links for optimum combination of the signals received from source and relay. Traditionally, the disintegrated CSIs are obtained with two channel estimators: one at the relay and the other at the destination. That is, the CSI of the S-R link is estimated at relay and passed to destination, and the CSI of the R-D link is estimated at destination with the help of pilot symbols transmitted by relay. In this paper, a new disintegrated channel estimator is proposed; based on an expectation-maximization (EM) algorithm, the disintegrated CSIs can be estimated solely by the estimator at destination. Therefore, the new method requires neither signaling overhead for passing the CSI of the S-R link to destination nor pilot symbols for the estimation of the R-D link. Computer simulations show that the proposed estimator works well under the signal-to-noise ratios of interest.
ER -