human: Given a node-centered hypergraph: <hypergraph>, where nodes represent authors and hyperedges represent groups of authors who co-authored the same paper.

Details of the hypergraph:
Center node: "A framework for software-defined digital terrestrial television (DTTV)"
  Abstract: Commercially viable free DTTV will depend on adoption of new technologies, some already available, that will in turn generate new business models. These technologies will permit new real and virtual channels through more efficient spectrum usage and dynamic sharing of the maximum data rate among several applications. The ongoing evolution of software-based receivers will provide the backbone for reliable reception indoors of arbitrarily formatted transmission that will not create new interference to other services

Connected through hyperedge HE-1 (induced by source paper "Interference to UHF-DTTV Channels by Unlicensed Devices"):
  with members:
    (none)

Question: Please tell me which research area the center author belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Computer science