A perspective on massive random-access

被引：0
作者：
Polyanskiy, Yury [1 ]
机构：
[1] MIT, Dept EECS, 77 Massachusetts Ave, Cambridge, MA 02139 USA
来源：
2017 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY (ISIT) | 2017年
基金：
美国国家科学基金会;
关键词：
RANDOM MULTIPLE-ACCESS; MULTIACCESS CHANNELS; SUPPORT RECOVERY; SLOTTED ALOHA; RESOLUTION; FEEDBACK; SYSTEM; LIMITS; CDMA;
D O I：
暂无
中图分类号：
TP301 [理论、方法];
学科分类号：
081202 ;
摘要：
This paper discusses the contemporary problem of providing multiple-access (MAC) to a massive number of uncoordinated users. First, we define a random-access code for K-a-user Gaussian MAC to be a collection of norm-constrained vectors such that the noisy sum of any K-a of them can be decoded with a given (suitably defined) probability of error. An achievability bound for such codes is proposed and compared against popular practical solutions: ALOHA, coded slotted ALOHA, CDMA, and treating interference as noise. It is found out that as the number of users increases existing solutions become vastly energy-inefficient. Second, we discuss the asymptotic (in blocklength) problem of coding for a K-a-user Gaussian MAC when K is proportional to blocklength and each user's payload is fixed. It is discovered that the energy-per-bit vs. spectral efficiency exhibits a rather curious tradeoff in this case.
引用
收藏
页码：2523 / 2527
页数：5
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