Joint Channel and Timing-Offset Estimation in Two-way Relays
Saeed Abdallah, Mohamed Saad, Khawla A. Alnajjar · 2019
In this paper, we consider the problem of joint channel and timing-offset estimation for amplify-and-forward (AF) two-way relay networks (TWRNs). In particular, we propose a novel maximum-likelihood (ML) algorithm for the joint estimation of the channel and the fractional timing-offset in AF TWRNs. The proposed algorithm is linear in the number of transmitted pilot symbols and does not require any multidimensional search. Our simulations show that the proposed algorithm performs close to the corresponding Cramer-Rao bound, and approaches ideal symbol error rate as the number of pilots increases.