Read the fine WNR614 manual p.42ff. ref. Wireless Distribution System (WDS).
Performance - already on the fact that this is a dated N300 technology router - must be very limited, and probably reduced even more by the depreciated WEP security requiring to limit to 54 bit/s. Unless you are living somewhere in the nowhere lands without any neighbors in WiFi reach, not security the WDS isn't a great idea too.
Not sure that's worth the effort. With today's Internet data rates and the bandwidth requirements of "simple" mobile phones and wireless computers there is no way around cables - even if the industry does try to promote "wire-free" solutions.
