High-Definition Video Distribution in 802.11g Home Wireless Networks

Multimedia distribution through wireless networks in the home environment presents a number of advantages which have fueled the interest of industry in recent years, such as simple connectivity and data delivery to a variety of devices. Together with High-Definition (HD) contents, multimedia wireless networks have been proposed for several applications, such as IPTV and Digital TV distribution for multiple devices in the home environment. For these scenarios, we propose a multicast distribution system for High-Definition video over 802.11 wireless networks based on rate-limited packet retransmission. We develop a limited rate ARQ system that retransmits packets according to the importance of their content (prioritization scheme) and according to their delay limitations (delay control). The performance of our proposed ARQ system is evaluated and compared with a similarly rate-limited ARQ algorithm. The results show a higher packet recovery rate and improvements in video quality for our proposed system.

Análise do padrão IEEE 802.11g para a comunicação do sistema de controle distribuído de semáforos.

Este trabalho propõe a análise da comunicação sem fio para um sistema de controle distribuído de semáforos, a partir da revisão das literaturas, realização de simulações e experimentos, os quais consideram as especificações estabelecidas para o sistema de semáforos. As simulações e os experimentos se baseiam na avaliação do comportamento da comunicação perante a alteração de alguns parâmetros de configuração da rede. O estudo apresentado envolve análises relacionadas ao padrão IEEE 802.11g e às definições da camada física apresentadas nas especificações do padrão. Os métodos utilizados envolvem o estudo e experimentação de parâmetros relacionados à potência de transmissão e recepção, além de análise dos esquemas de modulação utilizados pelo padrão IEEE 802.11g. A metodologia aplicada a este trabalho envolve o conhecimento das características e capacidade dos esquemas de modulação responsáveis pela definição das taxas de transmissão. As análises mostram que a possibilidade de adequação dos parâmetros de configuração de rede, levando em consideração o cenário de aplicação, pode ser um fator essencial para o bom desempenho de todo o sistema.

Na 1 Nachlass Max Horkheimer, 802 - "Dialektik der Aufklärung" von Max Horkheimer und Theodor W. Adorno (p. XI 6.3 - XI 6.42)

3. Aus der "Dialektik der Aufklärung"; Kapitel: "Juliette oder Aufklärung und Moral". Typoskript mit dem Titel "Aufklärung und Rigorismus", mit handschriftlichen Korrekturen, 52 Blatt (2 Exemplare); 4. Aus der "Dialektik der Aufklärung"; Kapitel: "Kulturindustrie". Typoskript mit dem Titel "Das Schema der Massenkultur":; 4a) Typoskript mit handschriftlichen Korrekturen, 67 Blatt; 4b) Typoskript mit eigenen Korrekturen, 106 Blatt; 5. - 110. Gedruckte und ungedruckte Aufzeichnungen und Entwürfe zur "Dialektik der Aufklärung: Sammlungen A, B, C, D, die teilweise identisch sind; 5. - 42. Sammlung A: "Aphorismen"; 5. "Zum Problem der Bedürfnisse". Typoskript, 5 Blatt; 6. "Mensch und Tier". Typoskript mit eigenen Korrekturen, 12 Blatt; 7. "Propaganda". Typoskript, 2 Blatt; 8. "Straftheorie". Typoskript mit eigenen Korrekturen, 3 Blatt; 9. "Dichtung und Moral". Typoskript mit eigenen Korrekturen, 5 Blatt; 10. "Zur Genese der Dummheit". Typoskript, 3 Blatt; 11. "Interesse am Körper". Typoskript mit eigenen Korrekturen, 6 Blatt; 12. "Philosophie und Arbeitsteilung". Typoskript, 3 Blatt; 13. "Widersprüche". Typoskript, 4 Blatt; 14. "Geschichte der amerikanischen Arbeiterschaft". Typoskript, 1 Blatt; 15. "Feind". Typoskript, 2 Blatt; 16. "Gezeichnet". Typoskript mit eigenen Korrekturen, 2 Blatt; 17. "Erkenntnis und Sprache". Typoskript, 1 Blatt; 18. "Unmöglichkeit der Dichtung". Typoskript, 1 Blatt; 19. "Erbsünde und Kopula". Typoskript, 2 Blatt; 20. "Die Einseitigkeit der Negativität". Typoskript, 2 Blatt [= "Für Voltaire" in der "Dialektik der Aufklärung"]; 21. "Klassifikation". Typoskript mit eigenen Ergänzungen, 1 Blatt; 22. "Jüdischer Charakter". Typoskript mit eigenen Korrekturen, 1 Blatt; 23. "Lawine". Typoskript mit eigenen Korrekturen, 2 Blatt; 24. "Solidarität". Typoskript mit eigenen Korrekturen, 2 Blatt; 25. "Bewußtsein". Typoskript, 1 Blatt; 26. "Gegen Bescheidwissen". Typoskript, 1 Blatt; 27. "Der Gedanke". Typoskript, 1 Blatt; 28. "Quand-même". Typoskript, 2 Blatt; 29. "Leeres Erschrecken". Typoskript mit eigenen Korrekturen, 2 Blatt; 30. "Haupt- und Nebensatz". Typoskript, 3 Blatt; 31. "Verwandlung der Idee in Herrschaft". Typoskript mit eigenen Korrekturen, 5 Blatt; 32. "Isolierung durch Verkehr". Typoskript, 1 Blatt; 33. "Kampf und Gewaltlosigkeit". Typoskript, 6 Blatt; 34. "Zwei Welten". Typoskript, 2 Blatt; 35. "Zur Theorie der Gespenster". Typoskript, 1 Blatt; 36. "Notiz" [= "Umschlag der idealistischen Dialektik"]. Typoskript, 1 Blatt; 37. "Massengesellschaft". Typoskript, 1 Blatt; 38. "Tierpsychologie". Typoskript, 1 Blatt; 39. "Denkmale der Humanität". Typoskript mit eigenen Korrekturen, 1 Blatt; 40. "Physiognomik". Typoskript mit eigenen Korrekturen, 1 Blatt; 41. "Die Rackets und der Geist". Typoskript mit eigenen Korrekturen, 7 Blatt; 42. "Altmodisches Problem". Typoskript mit eigenen Korrekturen, 2 Blatt;

Layer 2.5 Network Coding to Improve 802.11 Network Efficiency

Thesis (Master's)--University of Washington, 2016-06

Implementing an adaptive TCP fairness while exploiting 802.11e over wireless mesh networks

Purpose: The purpose of this paper is to investigate the use of 802.11e MAC to resolve the transmission control protocol (TCP) unfairness. Design/methodology/approach: The paper shows how a TCP sender may adapt its transmission rate using the number of hops and the standard deviation of recently measured round-trip times to address the TCP unfairness. Findings: Simulation results show that the proposed techniques provide even throughput by providing TCP fairness as the number of hops increases over a wireless mesh network (WMN). Research limitations/implications: Future work will examine the performance of TCP over routing protocols, which use different routing metrics. Other future work is scalability over WMNs. Since scalability is a problem with communication in multi-hop, carrier sense multiple access (CSMA) will be compared with time division multiple access (TDMA) and a hybrid of TDMA and code division multiple access (CDMA) will be designed that works with TCP and other traffic. Finally, to further improve network performance and also increase network capacity of TCP for WMNs, the usage of multiple channels instead of only a single fixed channel will be exploited. Practical implications: By allowing the tuning of the 802.11e MAC parameters that have previously been constant in 802.11 MAC, the paper proposes the usage of 802.11e MAC on a per class basis by collecting the TCP ACK into a single class and a novel congestion control method for TCP over a WMN. The key feature of the proposed TCP algorithm is the detection of congestion by measuring the fluctuation of RTT of the TCP ACK samples via the standard deviation, plus the combined the 802.11e AIFS and CWmin allowing the TCP ACK to be prioritised which allows the TCP ACKs will match the volume of the TCP data packets. While 802.11e MAC provides flexibility and flow/congestion control mechanism, the challenge is to take advantage of these features in 802.11e MAC. Originality/value: With 802.11 MAC not having flexibility and flow/congestion control mechanisms implemented with TCP, these contribute to TCP unfairness with competing flows. © Emerald Group Publishing Limited.