Adaptive Hierarchical Modulation and Power Allocation of Cooperative Relay

Author

Wu, Lindong ; Fei, Zesong ; Luo, Chen ; Kuang, Jingming

Author_Institution

Beijing Inst. of Technol., Beijing, China

fYear

2011

Firstpage

1

Lastpage

5

Abstract

In this paper, we consider a Demodulate-and-Forward (DMF) cooperation system, in which a new adaptive hierarchical modulation (HM) and power allocation scheme is proposed. In our new scheme, hierarchical 16-Quadrature Amplitude Modulation (16-QAM HM) is used to offer two different degrees of protection to the transmitted messages and we also employ power allocation between source and relay. A new optimization function based on maximizing the channel capacity, is given to obtain the optimal HM constellation and the best power allocation factor. We assume that all the channel state information (CSI) is available. Simulation results show that the proposed DMF system with our new strategy outperforms the reference system by about 2-2.5 dB.

Keywords

adaptive modulation; channel capacity; cooperative communication; optimisation; quadrature amplitude modulation; telecommunication security; 16-QAM HM scheme; DMF system; adaptive hierarchical modulation; best power allocation factor; channel capacity; channel state information; cooperative relay; demodulate-and-forward cooperation system; hierarchical 16-quadrature amplitude modulation scheme; optimal HM constellation; optimization function; Bit error rate; Channel capacity; Phase shift keying; Relays; Reliability; Resource management;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing (WiCOM), 2011 7th International Conference on

Conference_Location

Wuhan

ISSN

2161-9646

Print_ISBN

978-1-4244-6250-6

Type

conf

DOI

10.1109/wicom.2011.6040181

Filename

6040181