Title: Introduction to Compressive Random Access for Machine-Type Communications
Abstract: Compressive random access has been studied for machine-type communications (MTC) to support a number of devices. The main difference from conventional random access is to exploit the sparsity of active devices with a number of non-orthogonal channels. Thanks to a number of non-orthogonal channels, the probability of collision can be low, while compressive sensing (CS) based multiuser detection (MUD) can be used to detect the signals from multiple active devices simultaneously. It can be shown that compressive random access can provide a higher throughput than multichannel ALOHA at the cost of high detection complexity. In addition, compressive random access can allow device identification for physical-layer authentication if sparse identification sequences are employed.