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In this paper, a cooperative channel estimation strategy is proposed in multi-cell large scale antenna systems (so-called “massive MIMO”). Based on time-shifted uplink pilot sequences, the strategy can alleviate the performance degradation caused by the pilot contamination. In addition, the truncated conjugate gradient trust region (TCGTR) algorithm is proposed to estimate the channel vectors. The...
In this paper, we propose a novel Turbo equalization algorithm based on compressive sensing (CS) sparse channel estimation in wideband high frequency (HF) systems. Taking full advantage of the time-domain-sparsity of the wideband-HF channel, orthogonal frequency division multiplexing (OFDM) sparse channel estimation based on compressive sensing (CS) effectively reduce the number of pilots to estimate...
This paper addresses the problem of robust Tomlinson-Harashima precoding (THP) for multiple-input multiple-output (MIMO) relay systems. The robust nonlinear transceiver design consists of a TH precoder at the source along with a linear precoder at the relay and an minimum-mean-squared-error (MMSE) receiver at the destination. The imperfect channel state information (CSI) is considered. By taking the...
This paper presents a practical channel estimation algorithm based on cyclic orthogonal training sequence for relay-assisted cooperative communication system. In this algorithm, the relay nodes receive the cyclic orthogonal training sequence and circularly shift them to ensure the orthogonality before retransmitting them. It is in low complexity and the destination node can be in a good condition...
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