Capacity of the Deletion Channel Consider a Binary Deletion Channel with a deletion probability p of 1/2 and the channel has no error correction coding at all and that any given message can only be sent once. I want to conjecture that the capacity for the aforementioned channel is zero ( channel capacity for the Deletion Channel is presently unknown), can anyone point to any known complexity results that would point me in the direction of proving or disproving my conjecture?
The capacity of a deletion channel with deletion probability $p$ is still not fully understood, however it is known to be somewhere between $1-h(p)$ and $(1-p)/9$.

See a survey by Michael Mitzenmacher on deletion channels: A survey of results for deletion channels and related synchronization channels.