Transceiver Design for Dual-Hop Non-regenerative MIMO-OFDM Relay Systems Under Channel Uncertainties

TL;DR

This paper proposes a Bayesian-based joint transceiver design for dual-hop MIMO-OFDM relay systems that accounts for channel estimation errors, improving performance over traditional methods.

Contribution

It introduces a novel joint design framework for relay and destination transceivers considering channel uncertainties, extending to source precoder design.

Findings

Proposed design reduces mean-square-error compared to existing methods.

Design performs well under both correlated and uncorrelated channel errors.

Simulation confirms improved performance over estimated channel-based designs.

Abstract

In this paper, linear transceiver design for dual-hop non-regenerative (amplify-and-forward (AF)) MIMO-OFDM systems under channel estimation errors is investigated. Second order moments of channel estimation errors in the two hops are first deduced. Then based on the Bayesian framework, joint design of linear forwarding matrix at the relay and equalizer at the destination under channel estimation errors is proposed to minimize the total mean-square-error (MSE) of the output signal at the destination. The optimal designs for both correlated and uncorrelated channel estimation errors are considered. The relationship with existing algorithms is also disclosed. Moreover, this design is extended to the joint design involving source precoder design. Simulation results show that the proposed design outperforms the design based on estimated channel state information only.