Wireless Network-on-Chip (WNoC) is a promising paradigm to overcome the versatility and scalability issues of conventional on-chip networks for current processor chips. However, the chip environment suffers from delay spread which leads to intense Inter-Symbol Interference (ISI). This degrades the signal when transmitting and makes it difficult to achieve the desired Bit Error Rate (BER) in this constraint-driven scenario. Time reversal (TR) is a technique that uses the multipath richness of the channel to overcome the undesired effects of the delay spread. As the flip-chip channel is static and can be characterized beforehand, in this paper we propose to apply TR to the wireless in-package channel. We evaluate the effects of this technique in time and space from an electromagnetic point of view. Furthermore, we study the effectiveness of TR in modulated data communications in terms of BER as a function of transmission rate and power. Our results show not only the spatiotemporal focusing effect of TR in a chip that could lead to multiple spatial channels, but also that transmissions using TR outperform, BER-wise, non-TR transmissions it by an order of magnitude

翻译：无线网络-on-chip（WNoC）是一种有前景的范式，旨在解决当前处理器芯片中传统片上网络在通用性和可扩展性方面的问题。然而，芯片环境存在时延扩展，导致严重的符号间干扰（ISI）。这会在传输过程中降低信号质量，使得在约束驱动的场景下难以达到理想的误码率（BER）。时间反转（TR）是一种利用信道多径丰富性来克服时延扩展不利影响的技术。由于倒装芯片信道是静态的且可预先表征，本文提出将TR应用于无线封装内信道。我们从电磁学角度评估了该技术在时间和空间上的效果。此外，我们还研究了TR在调制数据通信中基于传输速率和功率的BER有效性。结果表明，TR不仅在芯片中产生时空聚焦效应，可能实现多个空间信道，而且使用TR的传输在BER方面比非TR传输高出一个数量级。