Optimal training sequences for channel estimation in bi-directional relay networks with multiple antennas

Authors:
The-Hanh Pham;Ying-Chang Liang;A. Nallanathan;Hari Krishna Garg
Affiliations:
Department of Electrical & Computer Engineering, National University of Singapore, Singapore;Institute for Inforcomm Research, Connexis, Singapore;Division of Engineering, King's College London, United Kingdom;Department of Electrical & Computer Engineering, National University of Singapore, Singapore
Venue:
IEEE Transactions on Communications
Year:
2010

Citing 3
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Abstract

In this letter, we consider a bi-directional relay network in which two users, U1 and U2, exchange their information via a relay station, RS. Multiple antennas are deployed at both users and at RS. Single carrier cyclic prefix (SCCP) is used to combat intersymbol interference (ISI) in frequency-selective fading channels. The transmission process is divided into two time slots. At the first time slot, both users send their information to RS concurrently. RS then amplifies and broadcasts its received signals at the second time slot. We propose an algorithm to estimate the channel information at end users based on the least-square (LS) principle. To further minimize the mean square error (MSE) of the estimate, a method to design the optimal training sequences is also proposed. Simulation results show that the performance achieved by our optimal design is close to that with perfect channel information.