Paper Info
Title
Graph modulations for massive MIMO systems
Abstract
A new graph modulation scheme is proposed for massive multiple-input multiple-output (MIMO) systems with a large number of transmit antennas. Each data symbol is transmitted in the form of multiple weighted replicas. The replicas from different symbols are multiplexed onto a two-dimensional (2D) space-time grid, which is formed by multiple transmit antennas in the space domain and different transmission instants in the time domain. Multiplexing repeated symbols onto a 2D space-time grid achieves performance gains in terms of both diversity gain and high degree-of-freedom of the received signals. In addition, it enables a bipartite graph representation of the system, with one set of nodes being the transmitted symbols and the other set containing the received space-time samples. A modified message passing algorithm is proposed to iteratively detect the transmitted symbols by exploiting the structure of the bipartite graph. The proposed graph modulation scheme can flexibly adjust the tradeoff among energy efficiency, spectral efficiency, space diversity, and detection complexity by choosing different design parameters based on application requirements. Simulation results demonstrate that the proposed approach can achieve significant performance gains over the conventional spatial multiplexing scheme used in MIMO systems.
Year
DOI
Venue
2013
10.1109/GLOCOM.2013.6831727
GLOBECOM
Keywords
Field
DocType
massive mimo system,spatial multiplexing scheme,2d space-time grid,radio transmitters,transmitting antennas,multiplexing repeated symbol,massive multiple-input multiple-output system,iterative detection complexity,space division multiplexing,modified message passing algorithm,bipartite graph representation,antenna arrays,graph modulation scheme,multiple transmitting antenna,multiple weighted replicas,mimo communication,graph theory,message passing,received space-time sample,energy efficiency,spectral efficiency,iterative methods,space diversity,two-dimensional space-time grid,tin,multiplexing,mimo,modulation,manganese
MIMO-OFDM,Diversity gain,Antenna diversity,3G MIMO,Computer science,Bipartite graph,Algorithm,MIMO,Real-time computing,Theoretical computer science,Spectral efficiency,Spatial multiplexing
Conference
ISSN
Citations 
PageRank 
2334-0983
0
0.34
References 
Authors
7
2
Name
Order
Citations
PageRank
Liang Hong119333.79
Jingxian Wu200.34