Title :
Research on cooperative diversity communication systems with adaptive modulation technique
Author :
Wang, Jingning ; Tan, Xuezhi
Author_Institution :
54th Res. Inst., China Electron. Technol. Group Corp., Shijiazhuang, China
Abstract :
In order to improve the spectral efficiency of cooperative diversity systems, adaptive modulation technique for Decoded-and-Forward cooperative communication systems is proposed in this paper. Cooperation is adopted when the signal to noise ratio of the source user is lower than a threshold. MQAM modulation scheme is used and a suitable modulation order is selected based on the source-destination, source-relay and relay destination channels. Simulation results show that the proposed cooperative diversity method can improve the spectral efficiency effectively with a suitable threshold and relay, and the spatial diversity gain can be obtained, too.
Keywords :
adaptive modulation; cooperative communication; decode and forward communication; quadrature amplitude modulation; relays; wireless channels; MQAM modulation scheme; adaptive modulation technique; cooperative diversity communication system; decoded-and-forward cooperative communication system; relay-destination channel; signal to noise ratio; source-destination channel; source-relay channel; spatial diversity gain; spectral efficiency; Adaptive systems; Bit error rate; Diversity methods; Fading; Modulation; Signal to noise ratio; Strontium; Decoded-and-Forward; adaptive modulation technique; cooperative diversity;
Conference_Titel :
Computer Science and Service System (CSSS), 2011 International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-9762-1
DOI :
10.1109/CSSS.2011.5974505
