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Estimation of Synchronization Parameters in AF Cooperative Networks

Ali Arshad Nasir ; Hani Mehrpouyan (Institutionen för signaler och system, Kommunikationssystem) ; Steven Blostein ; Salman Durrani ; Rodney A. Kennedy
2012 IEEE International Conference on Communications, ICC 2012, Ottawa, 10-15 June (1550-3607). p. 3713-3717. (2012)
[Konferensbidrag, refereegranskat]

In cooperative networks, multiple carrier frequency offsets (MCFOs) and multiple timing offsets (MTOs) originate due to multiple distributed nodes. In this paper, algorithms for joint estimation of these parameters and channels in amplify-and-forward (AF) relaying networks are proposed. A new training model and transceiver structure at the relays for achieving synchronization throughout the network is devised. New exact closed-form expressions for the Cram´er-Rao lower bounds (CRLBs) for the multi-parameter estimation problem are derived. An estimation method is proposed for jointly estimating MCFOs, MTOs, and channel gains at the destination based on space-alternating generalized expectation maximization (SAGE) and compared to a computationally-intensive least squares (LS) approach. The proposed estimator’s performance is shown to be close to the CRLB at mid-to-high signal-to-noise ratio (SNR) resulting in significant cooperative performance gains in the presence of practical impairments.

Nyckelord: Cooperative communications, timing and carrier synchronization, Expectation maximization (EM), Space-alternating generalized expectation-maximization (SAGE), Cram\'{e}r-Rao Lower bounds (CRLB)

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Denna post skapades 2012-01-10. Senast ändrad 2013-06-18.
CPL Pubid: 152215


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