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On Lattice-Code Based Multiple Access With Imperfect Channel State Information
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DOI：10.1109/LCOMM.2025.3606816.png)
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Abstract
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This letter studies lattice-code based multiple access (LCMA) degraded with imperfect channel state information (CSI). We present the achievable rate of the LCMA scheme under imperfect CSI, and formulate a new LCMA design problem. We then present a two-step approach to solve this problem. Numerical results demonstrate that our optimized LCMA significantly outperforms conventional MMSE and MMSE with successive interference cancellation (MMSE-SIC) at practical levels of channel estimation error by 5 dB when BLER $\leq 10^{-2}$ in 8-by-4 MIMO configuration with BPSK and rate 1/2 LDPC code.
Keywords:
Multiple-access
lattice code
multi-user MIMO
imperfect CSI
MMSE
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