January 01, 2018

25.4 Tb/s Transmission over Trans-Pacific Distances Using Truncated Probabilistically Shaped PDM-64QAM

Probabilistic constellation shaping (PCS), digital nonlinear compensation, and multi-rate spatially coupled low-density parity check codes are used to achieve 25.4 Tb/s transmission over 10,285km EDFA-only straight-line testbed at 6.1 bits/symbol/Hz. The gain provided by PCS over standard 64QAM is investigated over trans-Atlantic and trans-Pacific distances. Moreover, the potential benefits of nonlinear compensation based on digital-backpropagation versus algorithm complexity is addressed.

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Recent Publications

January 01, 2018

Fair Dynamic Spectrum Management for QRD-Based Precoding with User Encoding Ordering in Downstream G.fast Transmission

In next generation DSL networks such as G.fast, employing discrete multi-tone transmission in high frequencies up to 212 MHz, the crosstalk among lines reaches very high levels. To precompensate the crosstalk in downstream transmission, QRD-based precoding has been proposed as a near-optimal dynamic spectrum management (DSM) technique. However, the performance ...

January 01, 2018

Practical Mitigation of Passive Intermodulation in Microstrip Circuits

This paper presents new experimental evidence and a novel practical approach for mitigation of passive intermodulation (PIM) in microstrip circuits fabricated on commercial printed circuit board laminates. The mechanisms of distributed PIM in microstrip circuits are reviewed and a phenomenology of PIM generation due to locally enhanced electromagnetic fields at ...

January 01, 2018

Efficient Cooperative HARQ for Multi-Source Multi-Relay Wireless Networks

In this paper, we compare the performance of three different cooperative Hybrid Automatic Repeat reQuest (HARQ) protocols for slow-fading half-duplex orthogonal multiple access multiple relay channel. Channel State Information (CSI) is available at the receiving side of each link only. Time Division Multiplexing is assumed, where each orthogonal transmission occurs ...