Paper Info
Title
Optimum and sub-optimum multiuser detection based on sphere decoding for multi-carrier code division multiple access systems
Abstract
When performed using an exhaustive search, the maximum likelihood (ML) joint detection of all users in a multi-carrier code division multiple access (MC-CDMA) system has a prohibitive complexity, growing exponentially with the number of users and the number of bits in each modulation symbol. An ML multiuser detection algorithm has previously been proposed, with a complexity growing polynomially with the number of users, independent of the modulation size. The MC-CDMA system is modelled as a sphere packing lattice and a low-complexity optimum lattice decoder, called the sphere decoder, is applied to jointly detect all users. We propose sub-optimum simplifications, based on orthogonal projection of the received signal on a facet of the lattice constellation, to further decrease the complexity. Simulation results are shown with up to 64 users transmitting 16-QAM symbols.
Year
DOI
Venue
2002
10.1109/ICC.2002.997105
Communications, 2002. ICC 2002. IEEE International Conference
Keywords
Field
DocType
code division multiple access,decoding,lattice theory,maximum likelihood detection,multiuser channels,quadrature amplitude modulation,16-QAM symbols,MC-CDMA system,ML multiuser detection algorithm,lattice constellation,low-complexity optimum lattice decoder,maximum likelihood multiuser detection algorithm,multi-carrier code division multiple access systems,optimum multiuser detection,orthogonal projection,sphere decoding,sphere packing lattice,sub-optimum multiuser detection
Quadrature amplitude modulation,Brute-force search,Orthographic projection,Sphere packing,Computer science,Multiuser detection,Algorithm,Real-time computing,Modulation,Theoretical computer science,Decoding methods,Code division multiple access
Conference
Volume
ISBN
Citations 
3
0-7803-7400-2
2
PageRank 
References 
Authors
0.47
2
1
Name
Order
Citations
PageRank
Loïc Brunel114714.09