Convex Optimization
Hot topic: physical-layer network coding
Proceedings of the 12th annual international conference on Mobile computing and networking
Optimal beamforming for two-way multi-antenna relay channel with analogue network coding
IEEE Journal on Selected Areas in Communications - Special issue on network coding for wireless communication networks
Optimal channel estimation and training design for two-way relay networks
IEEE Transactions on Communications
Blind Channel Estimation for MIMO OFDM Systems via Nonredundant Linear Precoding
IEEE Transactions on Signal Processing
Optimal training design for MIMO OFDM systems in mobile wireless channels
IEEE Transactions on Signal Processing
On the sphere-decoding algorithm I. Expected complexity
IEEE Transactions on Signal Processing - Part I
On the effect of receiver estimation error upon channel mutual information
IEEE Transactions on Signal Processing
Optimal training signals for MIMO OFDM channel estimation
IEEE Transactions on Wireless Communications
Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
IEEE Transactions on Information Theory
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
IEEE Transactions on Information Theory
Joint frequency offset and channel estimation methods for two-way relay networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
On channel estimation for OFDM based two-way relay networks
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
IEEE Transactions on Signal Processing
EURASIP Journal on Wireless Communications and Networking - Special issue on physical-layer network coding for wireless cooperative networks
Channel estimation for two-way relay OFDM networks
EURASIP Journal on Wireless Communications and Networking - Special issue on physical-layer network coding for wireless cooperative networks
Reduced-Complexity Decision-Directed Channel Estimation in OFDM Systems with Transmit Diversity
Wireless Personal Communications: An International Journal
Robust Filter-and-forward Beamforming Design for Two-way Multi-antenna Relaying Networks
Mobile Networks and Applications
Optimal Timing at the Relay in OFDM Based Two Way Relay Systems
Wireless Personal Communications: An International Journal
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In this work, we introduce the model of employing orthogonal-frequency-division multiplexing (OFDM) for transmission over time-dispersive channels in the two-way relay network (TWRN), where two source terminals exchange their information through a relay terminal using the amplify-and-forward (AF) relaying scheme. We propose a two-phase training protocol for the channel estimation, which is compatible with the two-phase data transmission scheme. In the first phase, the two source terminals send their individual training sequences concurrently to the relay, while in the second phase the relay amplifies the received training sequences and broadcasts them to both source terminals. We propose two different types of training methods as well as develop their corresponding channel estimation algorithms at each of the two source terminals. The first type of training is block based, for which we first estimate the cascaded source-relay-source channels, and then design algorithms to recover the individual channels between sources and relay. The second type of training is pilot-tone (PT) based, for which we propose to directly estimate the individual channels between sources and relay. Moreover, the identifiability issues on the nonambiguous estimate of the channels in both types of proposed training are carefully addressed. Finally, various numerical examples are presented to corroborate our analytical results.