Joint channel, phase noise, and carrier frequency offset estimation in cooperative OFDM systems

Salim, Omar H. and Nasir, Ali A. and Xiang, Wei and Kennedy, Rodney A. (2014) Joint channel, phase noise, and carrier frequency offset estimation in cooperative OFDM systems. In: IEEE International Conference On Communications (ICC 2014): Communications: Centrepoint of the Digital Economy, 10-14 Jun 2014, Sydney, Australia.


Cooperative communication systems employ cooperation
among nodes in a wireless network to increase data throughput and robustness to signal fading. However, such advantages are only possible if there exist perfect synchronization among all nodes. Impairments like channel multipath, time varying phase noise (PHN) and carrier frequency offset (CFO) result in the loss of synchronization
and diversity performance of cooperative communication
systems. Joint estimation of these multiple impairments is necessary in order to correctly decode the received signal in cooperative systems. In this paper, we propose an iterative pilot-aided algorithm based on expectation conditional maximization (ECM) for joint estimation of multipath channels, Wiener PHNs, and CFOs in amplify-and-forward (AF) based cooperative orthogonal frequency
division multiplexing (OFDM) system. Numerical results show that the proposed estimator achieves mean square error performance close to the derived hybrid Cramer-Rao lower bound (HCRB) for different PHN variances.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: ©2014 IEEE. Published version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 25 Jun 2014 00:24
Last Modified: 13 Jul 2017 01:43
Uncontrolled Keywords: OFDM; phase noise; carrier frequency offset; AF; joint estimation; hybrid Cramer-Rao lower bound
Fields of Research : 09 Engineering > 0906 Electrical and Electronic Engineering > 090609 Signal Processing
10 Technology > 1005 Communications Technologies > 100510 Wireless Communications

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