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High Speed CDMA Communication in Optical Network on Chip

Abdi, Mania | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42861 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Hesabi, Shahin
  7. Abstract:
  8. As the number of processing cores on a single chip continues to grow, the need for a high band width, low power communication structure, will be the most important requirements of next generation chip multiprocessors. Today, a major part of power consumption in multi core architectures belongs to interconnects. Due to these facts, reducing consuming power, as well as supporting high performance, is concerned in these architectures. The concept of “network-on-chip” emerged to improve the performance of CMPs. But now a day, considering the circumstances of power budges, it’s incapable of presenting new strategies to decrease consuming power and delay. However, optical interconnects have the potential to replace electrical wires to solve the bottle neck of communication in integrated circuits. Sufficiency of photonic technology to have a low power, high band width interconnects, offers the novel idea of optical network-on-chip, which brings the benefits of optical signals and elements in the chip level. Last years, various routers and architectures with different point of views, is designed considering existing demands, while each has advantages and disadvantages. The first presented structure is not scalable, and in second one packet delay increased due to reservation phase. The main goal of this thesis is to reduce the time waste for holding path through overlapping several data flows and reduce scalability problems by grouping processing element assigned the same wavelength. Both these come off by coding optical data flows using CDMA techniques. To evaluate our design, at first we implement an ONoC simulator According to the proposed structure. Then compare it with previous structures in 22nm technology. Experimental results show improving latency by 26.95 and 4.62 than electrical network on chip using CDMA coding and optical nework on chip with the same topology without CDMA coding respectively. Moreover, energy per bit enhance by 9.65 times than optical Mesh NoC without CDMA coding. Therefore, SELON is a good approach to replace with current electricl NoC to improve power and latency while it addresses issues related to other optical NoCs.
  9. Keywords:
  10. Optical Transfer ; Network-on-Chip (NOC) ; Power Consumption ; Scalability ; Code Division Multiple Access (CDMA)Communication ; Code Division Multiple Access (CDMA)Coding

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