human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "unified receiver design in wireless relay networks using mixed integer programming techniques"):
  Abstract: Wireless receiver design is critical to the overall system performance. In this work, we apply the techniques of mixed-integer programming to formulate a unified receiver in relay networks with only partial channel information. We also relax all the constraints into real field to save computations, but at the cost of bit error performance. Moreover, a receiver formulation with adaptive number of constraints is proposed using the cutting plane techniques. Last but not least, number of flops is investigated for different formulations.

Includes members:
  Member "joint turbo receiver for ldpc coded mimo systems based on semi definite relaxation":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "semidefinite relaxation based blind equalization using constant modulus criterion")
  Member "non iterative joint detection decoding receiver for ldpc coded mimo systems based on sdr":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "semidefinite relaxation based blind equalization using constant modulus criterion")
  Member "integrated semi definite relaxation receiver for ldpc coded mimo systems":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "semidefinite relaxation based blind equalization using constant modulus criterion")
  Member "semidefinite relaxation based blind equalization using constant modulus criterion":
    also connected through other hyperedges:
      (none)
  Member "phase noise compensation using limited reference symbols in 3gpp lte downlink":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "joint turbo receiver for ldpc coded mimo systems based on semi definite relaxation")

Question: Please tell me which class the source paper belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.IT(Information Theory)