Sparse regression codes with MA-OAMP achieve the full capacity region of MIMO-MAC through power allocation over position-modulated signals and time sharing.
On capacity optimality of OAMP: Beyond iid sensing matrices and gaussian signaling,
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Capacity-Region-Achieving Sparse Regression Codes for MIMO Multiple-Access Channels
Sparse regression codes with MA-OAMP achieve the full capacity region of MIMO-MAC through power allocation over position-modulated signals and time sharing.