I come from a computer science background but physics is not presently one of my strengths. I've been reading some research regarding multi-hop routing of wireless (ad-hoc) networks such as this paper and this one.
One item that the authors seem to take for granted is the fact that a wireless signal will interfere with itself across a single node that is responsible for receiving and forwarding the signal (datagram) about 50% of the time. WHAT!? A 50% loss rate sounds like the most important thing to devote research toward mitigating! Yet, these authors aren't dunces. There must be a really good reason why self-interference is extremely difficult to work around.
So, for someone familiar with networking and computer science, but not as much with wireless networking and certainly not the physical layer's nuances, can anyone explain why packets being forwarded to and then from a mid-point node will interefere with itself (and perhaps even why it is hard/impossible to avoid it)?