  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
