Title :
An LDPC Coded Adaptive Decode-and-Forward Scheme Based on the EESM Model
Author :
Xiang Chen ; Ming-Xiang Xie
Author_Institution :
Dept. of Commun. Technol., Hefei Electron. Eng. Inst., Hefei, China
Abstract :
User Cooperation is a promising technology to obtain diversity gain at terminals. According to the traditional decode-and-forward scheme, relay node help to transmit source node´s information with fixed number of modulation symbols all the time. It is not optimal in view of spectral efficiency, especially when the channel state is good. This paper introduces the adaptive DF scheme based on the minus exponential effective-SNR mapping (EESM) model. The optimal number to relay is predicted accurately. Furthermore, adaptive modulation is supported. The reliability requirement is satisfied, and the radio resource is saved for transmitting new information. Theoretical analysis and simulation results indicate that the adaptive DF scheme improves the spectral efficiency significantly.
Keywords :
adaptive modulation; cooperative communication; decode and forward communication; diversity reception; parity check codes; relay networks (telecommunication); telecommunication network reliability; EESM model; LDPC-coded adaptive decode-and-forward scheme; adaptive DF scheme; adaptive modulation; channel state; diversity gain; minus exponential effective-SNR mapping model; modulation symbol; optimal relay number prediction; radio resource; relay node; reliability requirement; source node information; spectral efficiency; theoretical analysis; user cooperation; Adaptation models; Interference; Modulation; Parity check codes; Relays; Signal to noise ratio; Tin; decode-and-forward; the minus exponential effective-SNR mapping model; user cooperation;
Conference_Titel :
Wireless Communication and Sensor Network (WCSN), 2014 International Conference on
Print_ISBN :
978-1-4799-7090-2
DOI :
10.1109/WCSN.2014.37
