Abstract
Optical wireless (OW) communications, besides being of great interest for indoor and outdoor applications, have been recently proposed as a powerful alternative to the existing wired and wireless radio frequency (RF) interconnects in a network-on-chip (NoC). Design and analysis of networks with OW links require a careful investigation of cross-link interference, which impacts considerably the efficiency of systems that reuse the same channel for multiple transmissions. Yet, there is no comprehensive analysis of interference for OW NoCs, and the analyses of crosstalk in optical waveguide communications usually rely on synchronous data transmissions. A novel framework for the analysis of on-chip OW communications in the presence of cross-link cochannel interference and noise is proposed, where asynchronous data transmissions are considered. Self-beating of interfering signals is also considered, which was often neglected in previous literature. The bit error probability (BEP) for arbitrary number of interfering sources is derived as a function of signal-to-noise ratio (SNR), interference powers, detection threshold and pulse shaping, using both exact and approximation methods. The proposed analysis can be applied to both noise- and interference-limited cases, and enables a system designer to evaluate reuse distance between links that share the same optical carrier for simultaneous communication in NoCs.
Highlights
O PTICAL wireless (OW) communications are among the promising solutions to growing bandwidth demand in macro-scale networks for a vast range of indoor and outdoor applications [1]–[3]
It is shown that the system robustness against interference increases with asynchronous transmission, RZ pulse shaping and suitable design of detection threshold
A case study with multiple on-chip optical wireless (OW) links is investigated, which shows how the proposed analysis can be exploited to evaluate the reuse distance between links operating on the same wireless channel
Summary
O PTICAL wireless (OW) communications are among the promising solutions to growing bandwidth demand in macro-scale networks for a vast range of indoor and outdoor applications [1]–[3]. In micro-scale networks, optical wireless (OW) links have been recently proposed as an interconnect technology [4]–[6] to provide efficient communication in a network-on-chip (NoC) [7]. The continuous increase in the density of processing cores cannot rely only on the traditional metal interconnections, since they have intrinsic limitations in communication bandwidth and power consumption [8]–[10]. These limitations have inspired many researchers to look for Manuscript received June 27, 2019; revised October 20, 2019; accepted December 4, 2019.
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