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：无线片上网络（WNoC）是解决当前处理器芯片传统片上网络灵活性与可扩展性问题的有前景范式。然而，芯片环境存在时延扩展，导致严重的符号间干扰（ISI）。这种干扰会降低传输信号质量，使得在约束驱动的场景中难以达到期望的误码率（BER）。时间反演（TR）是一种利用信道多径丰富性来克服时延扩展负面效应的技术。鉴于倒装芯片信道具有静态特性且可预先表征，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域和空域的影响。此外，我们研究了基于TR的调制数据通信在误码率随传输速率和功率变化时的有效性。结果表明，TR不仅能通过时空聚焦效应在芯片内形成多路空间信道，而且采用TR的传输在误码率性能上比非TR传输提升一个数量级。