Activity Detection for Grant-Free NOMA in Massive IoT Networks

no code implementations • 23 Dec 2022 • Mehrtash Mehrabi, Mostafa Mohammadkarimi, Masoud Ardakani

This is while existing methods need to know the activity rate of IoT devices, while our method works for unknown and even time-varying activity rates

Action Detection Activity Detection

An Approximate Maximum Likelihood Time Synchronization Algorithm for Zero-padded OFDM in Channels with Impulsive Gaussian Noise

no code implementations • 14 Aug 2020 • Koosha Pourtahmasi Roshandeh, Mostafa Mohammadkarimi, Masoud Ardakani

In wireless communication systems, Orthogonal Frequency-Division Multiplexing (OFDM) includes variants using either a cyclic prefix (CP) or a zero padding (ZP) as the guard interval to avoid inter-symbol interference.

Deep Learning Based Sphere Decoding

no code implementations • 6 Jul 2018 • Mostafa Mohammadkarimi, Mehrtash Mehrabi, Masoud Ardakani, Yindi Jing

In this paper, a deep learning (DL)-based sphere decoding algorithm is proposed, where the radius of the decoding hypersphere is learned by a deep neural network (DNN).