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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...

Tensor-Based Channel Estimation for Cooperative Diversity Scheme in the Presence of Timing and Frequency Offsets

The distributed nature of cooperative networks may result in multiple carrier frequency offsets (MCFOs) and multiple timing offsets (MTOs), which overshadow the diversity gains promised by cooperative communications. So the estimation of MCFOs and MTOs is an important implementation issue in practice. In this paper we propose a new channel estimation both at the relays and the destination in di...

SNR Maximization at CSI Aware AF Relay

This paper concerns two-hop communication over relay-assisted Block fading channel. It is assumed there is not a direct link between the transmitter and the affiliated destination and the communication occurs in two hops through the use of a relay, where the amplify and forward (AF) strategy is employed at this node. In this case, in a Rayleigh block fading channel, the optimal weight function ...

Estimating Timing and Frequency Offset along with Channel in Multi-Relay Cooperative Networks Using Amplify and Forward Network

Orthogonal synchronization has been a major problem in Cooperative Orthogonal Frequency Division Multiplexing (CO-OFDM) under the influence of both carrier frequency offset and timing offset with unknown channel gains. CO-OFDM network performance can be improved by employing Amplify-and-Forward (AF) relay strategy. The OFDM network comprises of many sub-carriers which requires an adjustment of ...