This document will help you to establish wireless network connection without installing any programs and then, configure wicd that manages connections automatically.
List all net devices:
ip link
Activate the wireless one:
ip link set wlan0 up
Start wifi-menu
and use it to configure profile:
wifi-menu wlan0
Now you should be connected to your network. Check that by pinging gateway.
Install wicd
from repository (it may take a while if you hadn't updated your system before):
pacman -Syu wicd
Enable wicd
service and reboot system:
systemctl enable wicd && reboot
Start wicd
configurator:
wicd-curses
Choose your network and press Right arrow
key. Check Automatically connect to this network
and type your wifi key to key
field. Then press F10
key. After pressing Enter
you should acquire connection.
That's all.