Gray Coded Constellation Shifting Scheme with Low Complexity in MB-OFDM UWB Systems

Abstract

Multi-band orthogonal frequency division multiplexing (MB-OFDM) with a dual carrier modulation (DCM) is a promising technique for ultra wideband (UWB) communication systems. However, it suffers from high peak-to-average power ratio (PAPR) at the transmitter because of the fundamental feature of the orthogonal frequency division multiplexing (OFDM). In this paper, we propose a new shifting scheme of a gray coded 16-quadrature amplitude modulation (QAM) constellation in the DCM mapping process that considerably reduces the PAPR. The PAPR reduction performance and computational complexity of the proposed scheme are compared to the existing PAPR reduction scheme. The simulation results show that the proposed scheme can reduce the PAPR and computational complexity effectively.

Keywords:

• Dual carrier modulation
• Multi-band orthogonal frequency division multiplexing
• Peak-to-average power ratio
• Ultra wideband

Additional information

Notes on contributors

Soobum Cho

Soobum Cho received the B.S. degree in electronics engineering from Dong-A University, Korea, in 2006, the M.S. and Ph.D. degrees in electronics and computer engineering from Hanyang University, Korea, in 2008 and 2012, respectively. He is currently a postdoctoral visiting scholar in electrical engineering at Stanford University, California. His research interests are in the areas of wireless communications theory, Cooperative relay, Massive MIMO, and LTE-Advanced. E-mail: [email protected]

Sang Kyu Park

Sang Kyu Park received the B.S. degree from Seoul National University, Korea, in 1974, the M.S. degree from Duke University, U.S.A. in 1980, and the Ph.D. degree from the University of Michigan, U.S.A. in 1987, all in Electrical Engineering. From July 1976 to October to 1978, he was a research Engineer at Agency for Defence Development, Korea. From August 1990 to August 1991, he was a visiting Scholar at the University of Southern California, U.S.A. Since March 1987, he has been with the Department of Electronics and Computer engineering at Hanyang University, Korea, where he is currently a Professor. His research interests are in the areas of communications theory, wireless communications, mobile communications, spread spectrum communications, and secure communications. E-mail: [email protected]