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Journal of Applied Mathematics
Volume 2014, Article ID 815617, 5 pages
http://dx.doi.org/10.1155/2014/815617
Research Article

Capacity of 60 GHz Wireless Communications Based on QAM

1College of Information Science & Technology, Qingdao University of Science & Technology, Qingdao, Shandong 266061, China
2State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, Jiangsu 210096, China
3School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
4Department of Electrical Engineering, Ocean University of China, Qingdao, Shandong 266100, China
5China United Network Communications Corporation Qingdao Branch, Qingdao, Shandong 266072, China

Received 24 January 2014; Accepted 2 April 2014; Published 29 April 2014

Academic Editor: Feng Gao

Copyright © 2014 Jingjing Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

With apparent advantages of the several GHz license-free spectrums, 10 W maximum transmit power, and so forth, 60 GHz wireless communication technology has become the first choice for Gbps level short-range wireless communications. This paper researches 60 GHz wireless communications over the additive white Gaussian noise channel. Channel capacity with quadrature amplitude modulation (QAM) is investigated for the unlicensed 59–64 GHz radio spectrum set aside by FCC. Moreover, the capacity with QAM is compared to that with phase shift keying (PSK). It is shown that QAM is capable of providing Gbps data rate and outperforms PSK especially when the modulation order is large. The results prove that QAM is an attractive scheme for 60 GHz wireless communications.