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In this paper, we propose a novel life-long learning framework, which constantly evolves with changing data distribution, learning new knowledge while retaining some old knowledge. In many practical systems, data in the past is still useful but no longer available. Therefore, a question arises on how to update the model based on both new data and current model. To address this issue, our framework...
Sparse Code Multiple Access (SCMA) is a recently designed spreading technology in which QAM symbols are mapped to different OFDMA tones. The codebook based mapping can be regarded as a spreading encoding process, where the shaping gain helps promote spectral efficiency and enhance system performance. Based on the SCMA encoding scheme, this paper proposes a joint Multi-user detection (MUD) and channel...
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