Abstract
In this paper, we consider a two-way multiple-input multiple-output (MIMO) relaying system employing simplified space-time (ST) coding at both sources. The signals received at each source form a third-order tensor, which satisfies a parallel tucker2 (PARATUCK2) model. Exploiting this structure, we present a novel semiblind united alternating least squares (Uni-ALS) receiver for jointly estimating the transmitted symbols and the individual channels. The identifiability and uniqueness conditions are analyzed. In contrast to training-based receivers, such as tensor-based channel estimation (TENCE), two-stage training (TST) and zero forcing (ZF) receiver, the proposed receiver improves the spectrum efficiency. Simulation results show that the proposed receiver yields superior performance in comparison with the two-stage training (TST) receiver.
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