There are many alternative accommodation options in Barcelona at all price ranges:

Accommodation in university residence halls is always a good value for money. To get to UAB, the most conveniently located residence is Residència d’Investigadors, just 5-10 min walk from the FGC station on Plaça Catalunya.

Hotel Serhs is located on the UAB campus, only 10-15 min walk from the conference venue.

Here are some other links to help you find hotels/hostels/pensions and private apartments in Barcelona:

Check out Barcelona tourist guide for a full range of accommodation options and a lot more.