Results 261 to 270 of about 274,921 (303)

Enhanced Random Access for Massive-Machine-Type Communications

IEEE Internet of Things Journal, 2021
In this article, we study a random access (RA) scheme to alleviate the RA channel (RACH) overload problem in the massive-machine-type communication (mMTC) environment. We first propose a timing advance-based preamble resource expansion (TAPRE) scheme which effectively increases preamble resources and reduces the preamble collision probability by ...
Byung-Hyun Lee   +3 more
openaire   +1 more source

Practical Synchronization Waveform for Massive Machine-Type Communications

IEEE Transactions on Communications, 2019
This paper proposes a practical synchronization waveform that is resilient to frequency error for machine-type communications with applications in massive Internet of Things (IoT). Mathematical properties of the waveform are derived, which are keys to addressing the practical issues.
Jingjing Zhang   +2 more
openaire   +1 more source

Introduction on Massive Machine-Type Communications (mMTC)

2019
With the rise of a new round of scientific and technological revolutions and industrial changes in the world, the emergence of a large number of new applications, new businesses, new fields and new markets pose more requirements and challenges to existing mobile communication technologies [1].
Fanggang Wang, Guoyu Ma
openaire   +1 more source

Pilot beamforming for massive machine type communication systems

2017 IEEE/CIC International Conference on Communications in China (ICCC), 2017
In this paper, we propose a novel pilot beamforming and CSI acquisition strategy for machine-type-communication systems to achieve reduction in pilot overhead and improve the channel estimation performance. Key idea of the proposed beam-forming technique is to sparsify the time-domain channel vector using the beamforming.
Hyoungju Ji, Jun Won Choi, Byonghyo Shim
openaire   +1 more source

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