SPHERE DECODER FOR NETWORK CODED COOPERATIVE COMMUNICATIONS | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 5, Volume 42, No 4, July and August 2014, Page 968-982 PDF (632.8 K) | ||||
| DOI: 10.21608/jesaun.2014.115041 | ||||
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| Authors | ||||
| Usama Sayed Mohammed1; Taha Khalf2; Safwat M. Ramzy3 | ||||
| 1Electrical Engineering Department,Faculty of Engineering,Assiut University, Assiut, Egypt | ||||
| 2Staff in Electrical Engineering Department, Faculty of Engineering, Assiut University, Egypt | ||||
| 3Electrical Engineering Department, Faculty of Engineering, Assiut University, Egypt | ||||
| Abstract | ||||
| In cooperative communications, multiple sources communicate with a single destination in the presence of relay nodes. Network coding in cooperative communications allows the relay nodes to combine the data received from the sources and send the linear combination to the destination. The difference in complexity, reliability and overhead is a critical issue when we compare among the different decoders. In this paper, soft-decision maximum a posterior (MAP) decoder that has an optimal reliability and neglected overhead is proposed. Moreover, the Sphere decoder is used to reduce the complexity of the proposed MAP decoder. The proposed implementation proves that the sphere decoder can be used to reduce the complexity of the MAP decoder to about 3% related to the original complexity of the decoder. | ||||
| Keywords | ||||
| Cooperative communication; Network coding; Sphere decoder; MAP decoder | ||||
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