August 14, 2017

Probabilistic Shaping via Non-Binary Codes

  • Jardel F.
  • Joseph J. Boutros
  • Measson C.

Shaping refers to engineering methods that adapt the signal distribution to a communication channel for increased efficiency. Recently, shaping methods have regained interest especially in optical communications where current technologies operate close the fundamental limits of the linear fiber channel model. Probabilistic amplitude shaping (PAS) has been proposed in [1] as a rather simple and efficient way to shape binarylabeled QAM constellations. In this paper, we show how this method can be generalized to non-binary alphabets. Information data is assumed to be shaped via look-up-tables and modern coding schemes to be used. We first present a scheme based on time sharing over prime fields. Second we design p2 circular constellations which are a natural modulation scheme for nonbinary PAS.

View Original Article

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 ...