IBM research paper on far-field ASR

I came across this research paper which was interesting to read through. The highlights were:

1.	The affirmation that far-field speech recognition is challenging.

2.	A mentioned word-error-rate (WER) of around 60%! That would translate to a command-error-rate of < 10%.

3.	Mention of microphone arrays. They appear to help, but not as much as one might hope.

Here's another paper.