AT&T announced Wednesday plans to double the speed of its wireless broadband network by 2011. The move to HSPA technology, and eventually LTE networks, will begin later this year. The nation’s second largest carrier also announced that the move to HSPA will allow it to begin testing its LTE technology for an initial deployment in 2011. LTE (Long-Term Evolution), which Verizon has also adopted, is a 4G technology that promises peak download speeds of at least 50Mbps. The upgrade to HSPA is one of a series of initiatives that AT&T unveiled this week.