Full-duplex consists in transmitting and receiving simultaneously in the same frequency band, which in theory allows to double the capacity of communication. The DUPLEX project objectives are:
- to study the theoretical limits (throughput) of full-duplex communication equipment, and in particular in the case of a Multiple Input Multiple Output (MIMO) equipment
- to develop antenna techniques, analog and digital processing for the cancellation of the transmitted signal at the receiver
- to develop a MIMO full-duplex communication equipment (prototype) for the next generation of communications.
The project addresses two scenarios:
- full-duplex communication between two communication nodes. In this case, the signal cancellation device uses the knowledge of signal, assumed to be known
- full-duplex relaying, in which the relay processes, amplifies and retransmits the received signal in the same band. In this scenario, several cases will be considered depending on the information to be relayed (i.e. decodable or not).
The project is divided into 5 tasks:
• The first task will consider the overall system aspects of the DUPLEX project. The refinement of the target scenario and the system requirements specification, taking into account real use cases and constraints, will be the starting point for the project implementation. Led by industrial partners, this task will ensure a consistent project development under common scope, requirements and working assumptions. The target system definition will indeed impose important constraints like for example the radio environment, the radio access technologies characteristics, the amount of available spectrum, the power available for transmissions, the required sensitivity and dynamics of the equipment, the number of antennas and any other relevant parameters
• Task 2 (digital cancellation) aims to go beyond the state of the art in terms of digital techniques for self-interference cancellation.
• Task 3 (analogue techniques) is devoted to the development of analogue techniques, including the design and implementation of antennas and circuits.
• Task 4 (prototyping) is dedicated to the integration of all the hardware and software parts developed (in Tasks 2 and 3) in the hardware MIMO platform OpenAirInterface (www.openairinterface.org), which is an existing Software Defined Radio platform developed by EURECOM. Furthermore, this task also aims to test and validate the system in laboratory conditions.
• Finally, task 5 (dissemination, communications) aims to promote the scientific results of the project and to disseminate the reusable results for future industrialization.
Research Topics of this PhD thesis
This thesis will focus both on self-interference cancellation and on multi-antenna transceiver techniques for wireless systems containing full duplex radio units.
Self-interference cancellation topics:
• We will in particular focus on pushing the limits of digital cancellation techniques, by modeling of non-linearities. Compressed sensing techniques will be used for the model determination.
• For the adaptation of digital filters, some attention will go to the relaying scenario, which represents a case of strong correlation between filter input and filter error.
• Extension to hybrid architectures: digital solutions cannot work alone
Multi-antenna transceiver techniques:
• FD MIMO Self backhauling in 5G
• (MIMO) relaying for interference reduction:
Design and analysis of multi-user multi-cell interference networks with MIMO relays, with mixed half and full duplex nodes.
• Two-way spatial filter training (exploiting reciprocity):
Bidirectional training schemes that use transmission over the channel to do fast filter computations, allowing superfast in-network transceiver adaptation with simultaneous transmission.
We are looking for a highly motivated person with a master degree in electrical engineering with a strong background in applied mathematics and signal processing as well as excellent programming skills (Matlab). Previous experience in the area of statistical signal processing, possibly applied to wireless radio communications will also constitute a significant advantage. English language and general communication skills also constitute a plus.
The application must include:
Applications should be submitted by e-mail to secretariat [at] eurecom [dot] fr and dirk [dot] slock [at] eurecom [dot] fr with the reference: SC_DS_PhD_DUPLEX_082016