mMTC场景下基于IDMA的随机接入技术研究

Massive Machine Type Communication (mMTC), as one of the three major scenarios of fifth-generation mobile communications (5G), puts forward new requirements for the number of accessible users.This study proposes a single-step random access technology whose receiving end is asynchronous based on interleave-division multiple-acces (IDMA). Simulations have proved that data can be decoded successfully by using polar code. The use of asynchronous receivers can allow different users to correctly receive data even when using the same preamble, and then the additional bits in the data part together with the preamble constitute a random user ID, which greatly increases the number of users that the system can access. At the same time, asynchronous receivers can achieve single-step random access, which greatly reduces the access delay compared to traditional two-step random access.