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Optimized multiuser detection algorithm for uplink SCMA system
- Source :
- The Journal of China Universities of Posts and Telecommunications. 24:11-17
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Sparse code multiple access (SCMA) is a competitive nonorthogonal access scheme for the next mobile communication. As a multiuser sharing system, SCMA adopts message passing algorithm (MPA) for decoding scheme in receiver, but its iterative method leads to high computational complexity. Therefore, a serial message passing algorithm based on variable node (VMPA) is proposed in this paper. Making some subtle alterations to message update in original MPA, VMPA can greatly reduce overall computing complexity of decoding scheme. Furthermore, considering that serial structure may increase decoding delay, a novel grouping scheme based sparse matrix is applied to VMPA. Simulation results verify that the new algorithm, termed as grouping VMPA (G-VMPA), can achieve a better tradeoff between bit error rate (BER) and computing complexity than MPA.
- Subjects :
- Computational complexity theory
Computer Networks and Communications
Computer science
Message passing
020206 networking & telecommunications
02 engineering and technology
Multiuser detection
Signal Processing
Telecommunications link
0202 electrical engineering, electronic engineering, information engineering
Bit error rate
Code (cryptography)
Algorithm
Decoding methods
Information Systems
Sparse matrix
Subjects
Details
- ISSN :
- 10058885
- Volume :
- 24
- Database :
- OpenAIRE
- Journal :
- The Journal of China Universities of Posts and Telecommunications
- Accession number :
- edsair.doi...........86bb9542cf511427cb2efd940e6ef323