Yaqi Li Xiaohu You 0001 Jiamin Li 0001 Chen Ji Bin Sheng 0003 Performance Analysis of Spatiotemporal 2-D Polar Codes for Massive MIMO with MMSE Receivers. 2025 July abs/2507.19986 CoRR https://doi.org/10.48550/arXiv.2507.19986 db/journals/corr/corr2507.html#abs-2507-19986 streams/journals/corr