Multi-operator networking techniques are provided for allowing two or more operators to share a wireless local area network. Accordingly, it is possible to protect a circuit from an overcurrent and thus to prevent deterioration andor destruction of a device due to the overcurrent. In other aspects, utilities are disclosed that are operable to perform various types of analyses on such extracted content and present graphical representations of such analyses on a display of a client device. An Alamouti encoder encodes the grouping symbol vector in an Alamouti scheme and transmits Alamouti-coded symbols through the four transmit antennas.