Optimum training sequence design for multi-input multi-output (MIMO) two-way wireless relay networks

• Published in: 2009 7th International Conference on Information, Communications and Signal Processing pp. 1 - 5
• Main Authors: The-Hanh Pham, Ying-Chang Liang, Nallanathan, A., Krishna, G.H.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.12.2009
• Subjects: Channel estimation; Design engineering; Frequency-selective fading channels; Intersymbol interference; MIMO; Peak to average power ratio; Power system relaying; Relays; Signal design; Signal processing
• ISBN: 9781424446568; 1424446562
• DOI: 10.1109/ICICS.2009.5397702

In this paper, we consider a multi-input multioutput (MIMO) two-way wireless relay network in which two users, U 1 and U 2 , exchange their information via a relay station, R. Single carrier cyclic prefix (SCCP) is used in the system to combat intersymbol interference (ISI) in frequency-selective fading channels. The transmission process is divided into two phases. At phase 1, both users send their information to R simultaneously. R then amplifies and transmits its received signals at Phase 2. We propose an algorithm to estimate the channel information at end users based on the least-square principle. To further minimize the mean square error (MSE) of the estimate, a method to design the optimal training sequences is also proposed. The proposed method does not estimate individual channels between each end user and R but incorporates them into composite channels. Simulation results show that the performance achieved by our optimal design is close to that with perfect channel information.