Creating and sharing knowledge for telecommunications


António José Castelo Branco Rodrigues
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Scope of activities

The research carried out within the Radio Systems Group spans both fundamental and applied research in joint projects with industry. The group conducts fundamental research in signal processing and coding for the physical layer of wireless networks (including for mm waves and THz communications), system level analysis of wireless networks, and hardware-oriented projects where radio transmission plays a key role.

Over the years, the group has participated in a number of European projects related to the development of the several generations of mobile systems (GSM, CDMA for UMTS, and LTE) and is now focusing on emerging techniques for future 5G networks: device-to-device communications, massive MIMO systems, in-band full-duplex, and network coding.

Regarding signal processing and coding, the group has expertise in modulation techniques (including OFDM and CPM), capacity-achieving codes (turbo-codes, LDPC, and lattice-codes), MIMO detection algorithms, efficient low-complexity receivers, interference-cancellation and equalisation techniques (in both time and frequency domains), relay-aided links, cooperative multi-point, and also digital satellite links. It has also been looking at cross-layer design of MAC and routing protocols tuned for scarce-resource networks, such as cellular ones, and studies new MAC protocols for the challenges in wireless sensor networks.

The group’s research has for a long time addressed radio access networks (RAN), planning and optimisation algorithms for mobile networks, and self-organised networks (SON). Namely, the group works on spectrum-planning, spectrum aggregation, resource allocation, and cognitive radio for green communications, and develops heterogeneous wireless networks for the coordination of swarms of aerial, terrestrial, and aquatic drones (including multi-hop communications).

The group has a solid record in hardware implementation, namely using software defined radio (both DSP and USRP) to assess new transmission and detection techniques, as well as considerable experience in radio-connected embedded systems (e.g., using Arduino and Raspberry Pi platforms).

- Signal Processing for Wireless Communications
- Digital Receiver Design
- Modulation and Coding Theory
- Wireless Networks
- Radio Navigation Systems
- Satellite Communication Systems
- Wireless Sensor Networks
- Cognitive Radio
- Software Defined Radio
- Embedded Systems
- Radio-Controlled Drones
- THz communications and devices
- Electromagnetic Energy Harvesting



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