You have 2 options
1 buy an access point or router that is configured as a bridge. a bridge enable you to connect a wired device to a wireless network
2. powerline adaptor, those adaptors transmit your signal using AC wiring. a 10/100 adpator will give you a throughtput of around 55 Mbps and a 10/100/100 will give you about 85 Mbps