论文标题
改进了多用户Mac的界限
Improved bounds for the many-user MAC
论文作者
论文摘要
多用户MAC是了解5G及以后大量随机访问能源效率的重要模型。随后的作品在Polyanskiy'2017中引入了AWGN渠道，为在给定的用户密度和有效载荷下实现目标每个用户误差所需的渐近最小能量所需的渐近最小能量，超出了AWGN设置。最著名的严格界限与最佳AMP算法一起使用空间耦合代码。但是，这些界限是不可行的，可以计算出几个（约10位）有效载荷。在本文中，我们使用空间耦合的代码簿设计以及标量AMP算法为多用户AWGN和Quasi static Releigh褪色Mac提供了新的可实现范围。所获得的界限甚至最多可容纳100位，并且在此有效载荷下胜过先前的界限。
Many-user MAC is an important model for understanding energy efficiency of massive random access in 5G and beyond. Introduced in Polyanskiy'2017 for the AWGN channel, subsequent works have provided improved bounds on the asymptotic minimum energy-per-bit required to achieve a target per-user error at a given user density and payload, going beyond the AWGN setting. The best known rigorous bounds use spatially coupled codes along with the optimal AMP algorithm. But these bounds are infeasible to compute beyond a few (around 10) bits of payload. In this paper, we provide new achievability bounds for the many-user AWGN and quasi-static Rayleigh fading MACs using the spatially coupled codebook design along with a scalar AMP algorithm. The obtained bounds are computable even up to 100 bits and outperform the previous ones at this payload.
