Information transmission
Focus
The research activity of the Transmission Group at Politecnico di Milano concerns the main aspects (theoretical and experimental) of the information transmission systems. Research focuses on information theory, code theory, modulation and signal processing, communications in the radio-channel, optical communications, fiber-optic and related technologies, satellite and depp-space communications.
Applications of this research are very broad, but a special attention is devoted to issues related to development of high capacity optical communications and novel broad-band access systems.
Applications of this research are very broad, but a special attention is devoted to issues related to development of high capacity optical communications and novel broad-band access systems.
Most relevant research achievements
High-Capacity Coherent Transmission
The generation and coherent detection of 112-Gb/s polarization-division-multiplexed (PDM) 16-ary quadrature amplitude modulation (16-QAM) at a spectral efficiency beyond 4 b/s/Hz have been considered, obtaining a transmission reach of 1022 km. The application of the Wiener method to the design of the optimal filter, both in phase-locked loop (PLL) and in pilot symbols-based single carrier recovery schemes for coherent detection, has been considered.
Mastering of the Polarization in Optical Communications
In developing high-capacity multilevel trasmission system, a novel strategy for realizing the polarization-division multiplexing was devised and experimented, achieving a 100-Gb/s transmission based on PDM-DQPSK with direct detection. In the same framework, an advanced solution for all-optical stabilization of the state of polarization based on the Raman fiber non-linearity was proposed.
WDM-PON (Passive Optical Network) for Access
A new solution for a colorless WDM-PON, based on a self-tuning cavity and aimed to a symmetrical transmission up to 10 Gb/s, was proposed in collaboration with Alcatel-Lucent, as described in two Patents. The activity originated a novel Project funded by EU in the FP7 Program (ERMES Project under grant agreement n. 288542), of which our Group acts as Project Coordinator.
Recently, the Group has been involved in the National PRIN Project ROAD-NGN regarding the development of optical solutions for the access network.
MIMO detectors and Low complexity decoding of Reed-Solomon codes
A novel family of SISO detectors for iterative MIMO receivers is proposed. The detector search is limited to small subsets of the QAM hyper-symbol constellation, through simple criteria, approaching the EXtrinsic Information Transfer of the MAP detector and delivering the same performance. A cyclotomic Fourier transforms with applications to algebraic decoding of Reed-Solomon codes is developed. The number of additions is considerably reduced, obtaining very good results, even using simple algorithms.
Wireless sensor networks
We considered the positioning problem in wireless sensor networks with a cross layer approach: we extended the interface between the physical layer ranging algorithm and the higher layer positioning algorithm proposing a “soft” distance estimator for improving target localization and tracking.
Satellite and Deep-Space Communications
The research activity in satellite and deep-space communications resulted in a new design of a 2-hop downlink from deep space for high link availability and a way of improving the localization of satellites and spacecrafts during rain on Earth.
The generation and coherent detection of 112-Gb/s polarization-division-multiplexed (PDM) 16-ary quadrature amplitude modulation (16-QAM) at a spectral efficiency beyond 4 b/s/Hz have been considered, obtaining a transmission reach of 1022 km. The application of the Wiener method to the design of the optimal filter, both in phase-locked loop (PLL) and in pilot symbols-based single carrier recovery schemes for coherent detection, has been considered.
Mastering of the Polarization in Optical Communications
In developing high-capacity multilevel trasmission system, a novel strategy for realizing the polarization-division multiplexing was devised and experimented, achieving a 100-Gb/s transmission based on PDM-DQPSK with direct detection. In the same framework, an advanced solution for all-optical stabilization of the state of polarization based on the Raman fiber non-linearity was proposed.
WDM-PON (Passive Optical Network) for Access
A new solution for a colorless WDM-PON, based on a self-tuning cavity and aimed to a symmetrical transmission up to 10 Gb/s, was proposed in collaboration with Alcatel-Lucent, as described in two Patents. The activity originated a novel Project funded by EU in the FP7 Program (ERMES Project under grant agreement n. 288542), of which our Group acts as Project Coordinator.
Recently, the Group has been involved in the National PRIN Project ROAD-NGN regarding the development of optical solutions for the access network.
MIMO detectors and Low complexity decoding of Reed-Solomon codes
A novel family of SISO detectors for iterative MIMO receivers is proposed. The detector search is limited to small subsets of the QAM hyper-symbol constellation, through simple criteria, approaching the EXtrinsic Information Transfer of the MAP detector and delivering the same performance. A cyclotomic Fourier transforms with applications to algebraic decoding of Reed-Solomon codes is developed. The number of additions is considerably reduced, obtaining very good results, even using simple algorithms.
Wireless sensor networks
We considered the positioning problem in wireless sensor networks with a cross layer approach: we extended the interface between the physical layer ranging algorithm and the higher layer positioning algorithm proposing a “soft” distance estimator for improving target localization and tracking.
Satellite and Deep-Space Communications
The research activity in satellite and deep-space communications resulted in a new design of a 2-hop downlink from deep space for high link availability and a way of improving the localization of satellites and spacecrafts during rain on Earth.
