Fast H.264 intra prediction for network video processing

This letter proposes a fast parallel and deeply pipelined architecture for realtime H. 264 intra 4x4 prediction capable of handling up to 32 High Definition video streams (1920x1080 @ 30 fps) simultaneously, while offering high flexibility and consuming only a fraction of resources available on modern FPGA's. The design has been validated on target using a state of the art Altera Stratix IV FPGA

A low power 40 Gbit/s cascaded extension to bit-interleaving optical networks enabling next-generation metro/access connectivity

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10 Gbit/s bit interleaving CDR for low-power PON

A novel, low power, downstream clock and data recovery (CDR)- decimator architecture is proposed for next generation, energy efficient 10 Gbit/s optical network units (ONUs). The architecture employs a new time division multiplexing bit-interleaving downstream concept for passive optical networks (Bi-PON) allowing early decimation of the incoming data and lowering of the processing speed to the user rate of the ONU, thus reducing the power consumption significantly

Voltage controlled oscillators for 40Gbit/s cascaded bit-interleaving PON

Technologies such as the Internet-of-Things and cloud services demand dynamic bandwidth allocation flexibility, which is not offered by the currently deployed solutions. The Bit-Interleaving PON (BiPON) and its cascaded extension the Cascaded Bit-Interleaving PON (CBI-PON) offer a solution that allows to increase bandwidths, reduce power consumption and have a much more flexible dynamic bandwidth allocation scheme. CBI-PON consists of multiple levels of BiPON with different line rates. For each of these line rates, clock-and-data recovery must be performed, which requires a set of different Voltage Controlled Oscillators (VCOs). This paper presents the VCOs designed for the CABINET chip, an implementation of a CBI-PON network device, allowing clock-and-data recovery for 40Gbit/s, 10 Gbit/s and 2.5 Gbit/s line rates

New method to design multiplier-less pulse shaping filters with minimal number of operations

Software-Defined Radio (SDR) technology is evolving rapidly, offering higher flexibility for wireless communication networks. For the sake of performance, and power consumption, filtering is commonly implemented in hardware using FPGAs. Pulse shaping in the transmitter and the corresponding matched filtering in the receiver, which together satisfy the Nyquist inter symbol interference (ISI) criterion, are no exception to this. To decrease the FPGA resources used by filters, to increase speed and to decrease power consumption the filter coefficients can be optimized by expressing them in canonical signed digit (CSD) form, using as few arithmetic operations per filter as possible, while maintaining acceptable filter characteristics. In this paper a new method to decrease the number of nonzero signed digits is presented. With this method a reduction of up to 65% of the nonzero signed digits per filter is realized, while decreasing the ISI ratio too

Fast synchronization 3R burst-mode receivers for passive optical networks

This paper gives a tutorial overview on high speed burst-mode receiver (BM-RX) requirements, specific for time division multiplexing passive optical networks, and design issues of such BM-RXs as well as their advanced design techniques. It focuses on how to design BM-RXs with short burst overhead for fast synchronization. We present design principles and circuit architectures of various types of burst-mode transimpedance amplifiers, burst-mode limiting amplifiers and burst-mode clock and data recovery circuits. The recent development of 10 Gb/s BM-RXs is highlighted also including dual-rate operation for coexistence with deployed PONs and on-chip auto reset generation to eliminate external timing-critical control signals provided by a PON medium access control. Finally sub-system integration and state-of-the-art system performance for 10 Gb/s PONs are reviewed

A low-energy rate-adaptive bit-interleaved passive optical network

Energy consumption of customer premises equipment (CPE) has become a serious issue in the new generations of time-division multiplexing passive optical networks, which operate at 10 Gb/s or higher. It is becoming a major factor in global network energy consumption, and it poses problems during emergencies when CPE is battery-operated. In this paper, a low-energy passive optical network (PON) that uses a novel bit-interleaving downstream protocol is proposed. The details about the network architecture, protocol, and the key enabling implementation aspects, including dynamic traffic interleaving, rate-adaptive descrambling of decimated traffic, and the design and implementation of a downsampling clock and data recovery circuit, are described. The proposed concept is shown to reduce the energy consumption for protocol processing by a factor of 30. A detailed analysis of the energy consumption in the CPE shows that the interleaving protocol reduces the total energy consumption of the CPE significantly in comparison to the standard 10 Gb/s PON CPE. Experimental results obtained from measurements on the implemented CPE prototype confirm that the CPE consumes significantly less energy than the standard 10 Gb/s PON CPE

'Soldiers for a joint cause': a relational perspective on local and international educational leagues and associations in the 1860s

De Maatschappij tot Nut van ’t Algemeen slaagde er in de periode van het Verenigd Koninkrijk der Nederlanden (1815-1830) niet in om duurzame afdelingen te vestigen in het katholieke Zuiden. Dertig jaar later flakkerde de wens opnieuw op om inhet ondertussen onafhankelijke België zusterverenigingen op te richten. Vooral de internationale contacten tijdens de congressen van de International Social Science Association (issa) tussen 1862 en 1865 voedden dit verlangen. Deze bijeenkomsten brachten experts vanuit verschillende landen samen en waren laboratoria voor de uitwisseling van informatie over sociale experimenten. Tijdens deze samenkomsten werden ook de verschillende organisatievormen van diverse verenigingen bestudeerd. Zo werden de Belgische pleitbezorgers voor seculier onderwijs tijdens het issa-congres in Amsterdam (1864) sterk beïnvloed door het organisatiemodel van Tot Nut. Kort na dit internationale contact werd in België de Ligue de l’Enseignement gesticht, een vereniging die het openbaar onderwijs wilde hervormen en openbare bibliotheken wilde institutionaliseren. De structuur van deze Belgische vereniging toont veel gelijkenissen met die van Tot Nut. Carmen Van Praet en Christophe Verbruggen onderzoeken deze transfer om een beter zicht te krijgen op de effectieve uitwisseling van deze organisatievorm en analyseren de internationale contacten van de Ligue om na te gaan welke impact deze Belgische vereniging had in het bredere netwerk van verenigingen die streefden naar onderwijshervorming.Between 1819 and 1830, the Dutch moral reform society Maatschappij tot Nut van ’t Algemeen [Society for Public Welfare] failed to establish any long-lasting local branches in the Catholic southern part of the Netherlands. Thirty years later, an upsurge in the number of international social reform congresses rekindled the desire to establish southern sister organizations. In this article, Carmen Van Praet and Christophe Verbruggen argue that the congresses of the International Social Science Association (issa) from 1862 to 1865 played a vital role in bringing together intermediaries from across Europe. These international congresses offered a transnational space where attendees not only exchanged information about social reform experiments, but also contributed to the dissemination of association structures. During the Amsterdam congress of the issa in 1864, the principal Belgian advocates of secular education were strongly influenced by contacts with the advocates of Tot Nut. Shortly after this contact, the Belgian Ligue de l’Enseignement, an association aimed at improving education and establishing public libraries, was founded and was modelled on the associational structure of Tot Nut. The Ligue also maintained contacts with other single and multi-issue European organizations, resulting in an educational reform network of sibling associations