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Compressive channel division multiple access for MTC under frequency-selective fading

journal contribution
posted on 2017-06-01, 00:00 authored by Jinho ChoiJinho Choi, N Y Yu
In this paper, we study random access for machine-type communications based on a multiple access scheme that exploits different channel state information (CSI) from active devices under frequency-selective fading, which is called channel division multiple access (ChDMA). In ChDMA, in order to use a low-complexity compressive sensing (CS) algorithm for multiuser detection (MUD) with a high transmission rate, we propose to use index modulation. Since the CSI is used as a signature for MUD, the CSI estimation becomes crucial. For the CSI estimation, pilot transmission can be considered where each active device randomly chooses a pilot from a set of pre-determined pilots. Since the CSI estimation suffers from pilot collision in this case, we propose multiple pilot transmissions and show that a low probability of collision can be achieved. A CS-based approach is derived not only to estimate the CSI, but also to detect randomly selected multiple pilot signals by exploiting the sparsity of active devices over frequency-selective fading channels.

History

Journal

IEEE transactions on communications

Volume

65

Issue

6

Pagination

2715 - 2725

Publisher

Institute of Electrical and Electronics Engineers

Location

Piscataway, N.J.

ISSN

0090-6778

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2017, IEEE