Realisierung einer adaptiven parallelen Hardwarearchitektur für hochperformante OFDMA

Die vorliegende Arbeit beschreibt ein OFDMA basiertes Kommunikationssystem für Zugangsnetzwerke. Wichtigstes Ziel der vorgestellten Implementierung ist die Erzielung einer hohen Kommunikationsbandbreite von mehr als 50 GBit/s. Gleichzeitig wird das präsentierte System jedoch auch umfassend betrachtet und realisiert, so dass echte Kommunikationsdaten in Form von Ethernetpaketen das Netzwerk passieren können

Single-laser 32.5 Tbit/s Nyquist WDM transmission

We demonstrate 32.5 Tbit/s 16QAM Nyquist WDM transmission over a total length of 227 km of SMF-28 without optical dispersion compensation. A number of 325 optical carriers are derived from a single laser and encoded with dual-polarization 16QAM data using sinc-shaped Nyquist pulses. As we use no guard bands, the carriers have a spacing of 12.5 GHz equal to the Nyquist bandwidth of the data. We achieve a high net spectral efficiency of 6.4 bit/s/Hz using a software-defined transmitter which generates the electrical modulator drive signals in real-time.Comment: (c) 2012 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibite

RTL-to-Layout Implementation of an Embedded Coarse Grained Architecture for Dynamically Reconfigurable Computing in Systems-on-Chip

International audienceThis paper describes the RTL-to-Layout implementation of the PACT XPP-III Coarse-Grained Reconfigurable Architecture (CGRA). The implementation activity was strictly based on a hierarchical approach in order to exploit performance optimization at all levels, as well as guarantee maximum scalability and provide a portfolio of IP-blocks that could be reused to build different configurations and embodiments of the same CGRA template. The final result can be seamlessly introduced in any SoC design flow as embedded accelerator. It is designed in STMicroelectronics 90nm GP technology, occupies 42.5 mm2, delivers 13 16-bit GOPS (0.8 GOPS/mW, 10 MOPS/mW) and has a measured max frequency of 150 MHZ, requiring a measured 13 mW/MHz dynamic power, 93 mW static. A silicon prototype was also produced embedding XPP-III in a complex system-on-chip including an ARM processor as system controller as well as different ASIC blocks

Supratentorial ependymoma in childhood: more than just RELA or YAP

Two distinct genetically defined entities of ependymoma arising in the supratentorial compartment are characterized by the presence of either a C11orf95-RELA or a YAP-MAMLD1 fusion, respectively. There is growing evidence that supratentorial ependymomas without these genetic features exist. In this study, we report on 18 pediatric non-RELA/non-YAP supratentorial ependymomas that were systematically characterized by means of their histology, immunophenotype, genetics, and epigenomics. Comprehensive molecular analyses included high-resolution copy number analysis, methylation profiling, analysis of fusion transcripts by Nanostring technology, and RNA sequencing. Based upon histological and immunohistochemical features two main patterns were identified-RELA-like (n = 9) and tanycytic ependymomas (n = 6). In the RELA-like group histologically assigned to WHO grade III and resembling RELA-fused ependymomas, tumors lacked nuclear expression of p65-RelA as a surrogate marker for a pathological activation of the NF-kappa B pathway. Three tumors showed alternative C11orf95 fusions to MAML2 or NCOA1. A methylation-based brain tumor classifier assigned two RELA-like tumors to the methylation class EP, RELA-fusion; the others demonstrated no significant similarity score. Of the tanycytic group, 5/6 tumors were assigned a WHO grade II. No gene fusions were detected. Methylation profiling did not show any association with an established methylation class. We additionally identified two astroblastoma-like tumors that both presented with chromothripsis of chromosome 22 but lacked MN1 breaks according to FISH analysis. They revealed novel fusion events involving genes in chromosome 22. One further tumor with polyploid cytogenetics was interpreted as PFB ependymoma by the brain tumor methylation classifier but had no relation to the posterior fossa. Clinical follow-up was available for 16/18 patients. Patients with tanycytic and astroblastoma-like tumors had no relapse, while 2 patients with RELA-like ependymomas died. Our data indicate that in addition to ependymomas discovered so far, at least two more supratentorial ependymoma types (RELA-like and tanycytic) exist

Flexible WDM-PON with Nyquist-FDM and 31.25 Gbit/s per wavelength channel using colorless, low-speed ONUs

A remotely seeded flexible WDM network solution with 31.25 Gbit/s based on Nyquist sinc-pulses is demonstrated. The low-speed, colorless ONUs use remote heterodyne detection with electrical up- and down-conversion and SOAs for potential cost reduction.Peer ReviewedPostprint (published version

Flexible WDM-PON with Nyquist-FDM and 31.25 Gbit/s per wavelength channel using colorless, low-speed ONUs

A remotely seeded flexible WDM network solution with 31.25 Gbit/s based on Nyquist sinc-pulses is demonstrated. The low-speed, colorless ONUs use remote heterodyne detection with electrical up- and down-conversion and SOAs for potential cost reduction.Peer Reviewe

Colorless FDMA-PON with flexible bandwidth allocation and colorless, low-speed ONUs [invited]

We demonstrate a remotely seeded flexible passive optical network (PON) with multiple low-speed subscribers but only a single optical line terminal transceiver operating at a data rate of 31.25 Gbits/s. The scheme is based on a colorless frequency division multiplexing (FDM)-PON with centralized wavelength control. Multiplexing and demultiplexing in the optical network unit (ONU) is performed in the electronic domain and relies either on FDM with Nyquist sinc-pulse shaping or on orthogonal frequency division multiplexing (OFDM). This way the ONU can perform processing at low speed in the baseband. Further, the ONU is colorless by means of a remote seed for upstream transmission and a remote local oscillator for heterodyne reception, all of which helps in keeping maintenance and costs for an ONU potentially low and will simplify wavelength allocation in a future software defined network architecture. To extend the reach, semiconductor optical amplifiers are used for optical amplification in the downstream and upstream.Peer Reviewe