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Non-orthogonal multiple access for massive Internet of Things


Non-orthogonal multiple access (NOMA) has been identified as a key technology in the fifth generation of mobile wireless standards to improve the network capacity. This project aims at designing novel NOMA schemes for massive IoT systems in order to accommodate a large number of devices within limited radio resources. Channel coding techniques and advanced multiuser processing techniques are explored in this project.In this project, we will answer this fundamental question "which transmission strategy is more effective: i) dynamically allocating more resource blocks for the random access procedure to detect each active IoT device and then allocating dedicated data channels and transmitting at full power (orthogonal transmission), or ii) limiting the number of resource blocks allocated to the random access channel and allowing devices to simultaneously transmit their messages at the same data channel (non-orthogonal transmission), with the expense of higher complexity at the base station, but with lower transmission power over a longer time, or iii) remove the random access phase altogether and allow devices to transmit multiple times through several resource blocks (grant-free non-orthogonal transmission)". A trade-off between the system complexity and throughput, access delay, and random access efficiency will be derived for both coordinated and uncoordinated multiple access strategies.


Dr Mahyar Shirvanimoghaddam, Professor Branka Vucetic.

Research location

Electrical and Information Engineering

Program type



In the near future our everyday physical objects will be transformed to information sources, communicating with each other and the underlying data transport infrastructure. This will create an ecosystem of connected devices and revolutionize the way we live today and open new roads for creativity and innovations. Around 50 billion devices will be installed by 2020 and they will generate an enormous data traffic. Providing connectivity and handling such a traffic are beyond the capabilities of current wireless standards, calling for breakthrough innovations in communication strategies. This project develops novel communication strategies for future wireless systems to support a large number of devices and diverse service requirements.

Additional information

This program is supported under an Australian Research Council Discovery Project Grant with collaboration of Prof. Mischa Dohler, King's College London, and Dr Gianluigi Liva, German Aerospace Centre.

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Opportunity ID

The opportunity ID for this research opportunity is 2409

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