Channel Estimation for Time-Varying MIMO Relay Systems
MetadataShow full item record
Funding and Sponsorship
In this paper, we investigate the channel estimation problem for multiple-input multiple-output (MIMO) relay communication systems with time-varying channels. The time-varying characteristic of the channels is described by the complexexponential basis expansion model (CE-BEM). We propose a superimposed channel training algorithm to estimate the individual first-hop and second-hop time-varying channel matrices for MIMO relay systems. In particular, the estimation of the secondhop time-varying channel matrix is performed by exploiting the superimposed training sequence at the relay node, while the first-hop time-varying channel matrix is estimated through the source node training sequence and the estimated second-hop channel. To improve the performance of channel estimation, we derive the optimal structure of the source and relay training sequences that minimize the mean-squared error (MSE) of channel estimation. We also optimize the relay amplification factor that governs the power allocation between the source and relay training sequences. Numerical simulations demonstrate that the proposed superimposed channel training algorithm for MIMO relay systems with time-varying channels outperforms the conventional two-stage channel estimation scheme.
Showing items related by title, author, creator and subject.
Chiong, Choo Wee Raymond; Rong, Yue; Xiang, Y. (2014)In this paper, we investigate the channel estimation problem for two-way multiple-input multiple-output(MIMO) relay communication systems in frequency-selective fading environments. We apply themethod of superimposed ...
Chiong, Choo; Rong, Yue; Xiang, Y. (2013)Two-way relay systems are known to be capable of providing higher spectral efficiency compared with conventional one-way relay systems. However, the channel estimation problem for two-way relay systems is more complicated ...
He, Z.; Yang, J.; Wang, X.; Liu, Y.; Rong, Yue (2017)OAPA In this article, we consider the channel estimation problem for multiple-input multiple-output (MIMO) wireless relay communication systems with multiple relay nodes. In particular, all individual channel matrices of ...