Collective Communication Patterns Using Time-Reversal Terahertz Links at the Chip Scale

TL;DR

This paper explores the use of time-reversal techniques to enhance multi-user wireless communication in the terahertz band at the chip scale, demonstrating improved symbol rates and spatial multiplexing through simulations.

Contribution

It introduces the application of time reversal for multi-user terahertz communication within computing packages, validated by full-wave simulations and error rate analysis.

Findings

Time reversal improves symbol rates in reverberant terahertz channels.

Multiple spatial channels can be created for simultaneous transmissions.

Simulation results show effective error rate reduction with increased transmitted power.

Abstract

Wireless communications in the terahertz band have been recently proposed as complement to conventional wired interconnects within computing packages. Such environments are typically highly reverberant, hence showing long channel impulse responses and severely limiting the achievable rates. Fortunately, this communications scenario is static and can be pre-characterized, which opens the door to techniques such as time reversal. Time reversal acts a spatial matched filter and has a spatiotemporal focusing effect, which allows not only to increase the achievable symbol rates, but also to create multiple spatial channels. In this paper, the multi-user capability of time reversal is explored in the context of wireless communications in the terahertz band within a computing package. Full-wave simulations are carried out to validate the approach, whereas modulation streams are simulated to evaluate the error rate as a function of the transmitted power, symbol rate, and number of simultaneous transmissions.