Approaching MAC Capacity via Power Allocation

Author

Zhang, Jingxi ; Bie, Zhisong ; Wu, Weiling

Author_Institution

Key Lab. of Universal Wireless Commun., Beijing Univ. of Posts & Telecommun., Beijing, China

fYear

2010

fDate

23-25 Sept. 2010

Firstpage

1

Lastpage

4

Abstract

A method to approach the capacity of Multiple Access Channel by means of power allocation was studied. By applying PAM modulation to each individual signal and superimposing the weighted signal together, we treated MAC channel as single user multiple level coding and modulation system. We found that the searched power profile was more powerful in terms of approaching MAC capacity than that obtained by equal power allocation and by Interior-Point Method (IPM), especially in the case of 4 users. The optimized power profile shows that at low signal-to-noise ratio (SNR) region the performance gain is negligible, while in high SNR region, it is noted. The optimized power profile can be used to facilitate the performance of channel coding.

Keywords

access protocols; channel coding; telecommunication channels; telecommunication power supplies; MAC capacity; PAM modulation; channel coding; interior-point method; multiple access channel; power allocation; signal-to-noise ratio; Channel capacity; Encoding; Modulation; Mutual information; Optimization; Resource management; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications Networking and Mobile Computing (WiCOM), 2010 6th International Conference on

Conference_Location

Chengdu

Print_ISBN

978-1-4244-3708-5

Electronic_ISBN

978-1-4244-3709-2

Type

conf

DOI

10.1109/WICOM.2010.5600225

Filename

5600225