Adaptive code division multiple access protocol for wireless network-on-chip architectures

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dc.contributor.advisor Kwasinski, Andres
dc.contributor.advisor Kudithipudi, Dhireesha Vijayakumaran, Vineeth 2012-10-23T18:50:00Z 2012-10-23T18:50:00Z 2012-06
dc.description.abstract Massive levels of integration following Moore's Law ushered in a paradigm shift in the way on-chip interconnections were designed. With higher and higher number of cores on the same die traditional bus based interconnections are no longer a scalable communication infrastructure. On-chip networks were proposed enabled a scalable plug-and-play mechanism for interconnecting hundreds of cores on the same chip. Wired interconnects between the cores in a traditional Network-on-Chip (NoC) system, becomes a bottleneck with increase in the number of cores thereby increasing the latency and energy to transmit signals over them. Hence, there has been many alternative emerging interconnect technologies proposed, namely, 3D, photonic and multi-band RF interconnects. Although they provide better connectivity, higher speed and higher bandwidth compared to wired interconnects; they also face challenges with heat dissipation and manufacturing difficulties. On-chip wireless interconnects is one other alternative proposed which doesn't need physical interconnection layout as data travels over the wireless medium. They are integrated into a hybrid NOC architecture consisting of both wired and wireless links, which provides higher bandwidth, lower latency, lesser area overhead and reduced energy dissipation in communication. However, as the bandwidth of the wireless channels is limited, an efficient media access control (MAC) scheme is required to enhance the utilization of the available bandwidth. This thesis proposes using a multiple access mechanism such as Code Division Multiple Access (CDMA) to enable multiple transmitter-receiver pairs to send data over the wireless channel simultaneously. It will be shown that such a hybrid wireless NoC with an efficient CDMA based MAC protocol can significantly increase the performance of the system while lowering the energy dissipation in data transfer. In this work it is shown that the wireless NoC with the proposed CDMA based MAC protocol outperformed the wired counterparts and several other wireless architectures proposed in literature in terms of bandwidth and packet energy dissipation. Significant gains were observed in packet energy dissipation and bandwidth even with scaling the system to higher number of cores. Non-uniform traffic simulations showed that the proposed CDMA-WiNoC was consistent in bandwidth across all traffic patterns. It is also shown that the CDMA based MAC scheme does not introduce additional reliability concerns in data transfer over the on-chip wireless interconnects. en_US
dc.language.iso en_US en_US
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dc.subject CDMA MAC protocol en_US
dc.subject CDMA-WiNoC en_US
dc.subject Emerging interconnects en_US
dc.subject Network on chip en_US
dc.subject On chip wireless interconnects en_US
dc.subject Vineeth Vijayakumaran en_US
dc.subject.lcc TK5103.452 .V45 2012
dc.subject.lcsh Code division multiple access en_US
dc.subject.lcsh Networks on a chip en_US
dc.subject.lcsh Computer architecture en_US
dc.title Adaptive code division multiple access protocol for wireless network-on-chip architectures en_US
dc.type Thesis en_US Kate Gleason College of Engineering en_US
dc.description.department Department of Computer Engineering en_US
dc.contributor.advisorChair Ganguly, Amlan

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