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We investigate physical-layer network coding for two-way relaying systems which employ multiple-input multiple-output (MIMO) techniques. For single-antenna cases, it has been previously verified that adaptive network coding, whose mapping rule is dependent on channel state information (CSI), can offer good performance for two-stage relaying protocols. In this paper, we evaluate gains achieved by adaptive...
In this paper, we present a forwarding strategy for two-stage bidirectional relaying in which trellis-coded modulation (TCM) is employed. We reveal that adaptive network coding cannot resolve distance shortening occurred at specific channel conditions when a certain TCM is used. To overcome this issue, we introduce an improved amplify-and-forward (AF) scheme termed pseudo AF (PAF). The proposed strategy...
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