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Sparse code multiple access system with multiple antennas offers unprecedented massive connectivity and capacity. To reduce the interference in a downlink multiple user SCMA (MU-SCMA) system, we propose a layer-aware interference mitigation scheme (L-AIMS). Firstly, preprocess the codewords of paired users to mitigate the intra-layer interference. Secondly, adopt the generalized singular value decomposition...
In this letter, we derive some asymptotic equivalent (AE) sum rates of a multicell downlink massive multiple-input multiple-output (MIMO) system with different beamforming schemes. Due to insufficient antenna spacing and user mobility, we take spatial and temporal correlation into consideration and obtain a correlated channel state information (CSI) model. Under the correlated CSI model, the AE sum...
Sparse code multiple access (SCMA) is a new multiple access technique with reusing non-orthogonal code domain resource. It has massive connectivity serving a large number of users and improves spectral efficiency of radio access. SCMA directly maps the information bits of different users to sparse complex codewords selected from the predefined codebooks, and each codeword represents a transmission...
In this paper, we propose a scheme to design transmit beamforming considering the effect of channel estimation at the transmitter. Under the multi-cell downlink massive MIMO system, coordinated beamforming is obtained by applying uplink-downlink duality for transmit power minimization problem subject to signal-to-interference-plus-noise ratio (SINR) constraints. To handle much information exchange...
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