Visa information for visiting Sweden
In general, access for international participants to conventions in Sweden is not a problem. However, if you wish to visit Sweden for business or to attend a conference and are a citizen of a country outside the EU, you will in most cases need a visa. As of 5 April 2010, the EU´s Visa Code applies as law in Sweden. Through the Visa Code, the provisions on visas for a period shorter than three months are brought together in one EU Regulation. The Visa Code applies to all Schengen countries. A visa granted by any one of these countries is also valid for visits to the others. In exceptional cases — for example, if the holder's passport is not approved by all Schengen countries — the visa may only be valid for entry into the issuing country or only for certain countries. Further information For further information and how to apply, please see the Swedish Migration Board’s website, http://www.migrationsverket.se/info/140_en.html
Source: Stockholm Migration Board, January 2014
A list of the countries whose nationals are required to get a visa for Sweden can be found here: http://www.government.se/sb/d/12386/a/241031
Visa Assistance Letters
The IEEE Communications Society can provide a VISA assistance letter to you after you register for your conference.