Timing Estimation and Resynchronization for Amplify-and-Forward Communication Systems

Comments on "Timing Estimation and Resynchronization for Amplify-and-Forward Communication Systems"

This correspondence first shows that the Cramer-Rao lower bound (CRLB) derivations in the above paper are incorrect. In addition, contrary to the claims in the above paper, the assumptions of perfect timing offset estimation and matched-filtering at the relays affect the generality of the analytical results and cannot be justified assumption.

Author's Reply to "Comments on 'Timing Estimation and Resynchronization for Amplify-and-Forward Communication Systems'"

Cramér-Rao Bounds for Channel Estimation in Amplify-and-Forward Cooperative Communication Systems

The Cramér-Rao bounds of centralized and distributed channel estimations are studied for the cooperative communication systems with single amplify-and-forward relay and two transmission phases. Particularly, two cooperation protocols are considered with full cooperation in both transmission phases and partial cooperation in the listening phase, respectively. It is shown that centralized channel...

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تخمین دقیق مشخصات کانال در سیستم های مخابراتی یک امر مهم محسوب می گردد. این امر به ویژه در کانال های بیسیم با ‏خاصیت فرکانس گزینی و زمان گزینی شدید، چالش بزرگی است. مقالات متعدد پر از روش های مبتکرانه ای برای طراحی و آنالیز ‏الگوریتم های تخمین کانال است که بیشتر آنها از روش های خاصی استفاده می کنند که یا دارای عملکرد خوب با پیچیدگی ‏محاسباتی بالا هستند و یا با عملکرد نه چندان خوب پیچیدگی پایینی...

Joint Transceiver Design for Amplify-and-Forward Multiuser MIMO Relay Communication Systems with Source-Destination Links

—In this paper, we generalize the iterative algorithms proposed by Khandaker to amplify-and-forward multiuser Multiple-Input Multiple-Output (MIMO) relay communication systems with the source-destination links. Compared with the conventional algorithms, where the source-destination links are ignored, the evolved Tri-Step method and Bi-Step method are derived for the new system model with the s...