Asymmetric hexagonal QAM based OFDM system

Author

Xingxin, Gao ; Mingquan, Lu ; Zhenming, Feng

Author_Institution

Dept. of Electron. Eng., Tsinghua Univ., Beijing, China

Volume

1

fYear

2002

fDate

29 June-1 July 2002

Firstpage

299

Abstract

OFDM (orthogonal frequency division multiplexing) has been widely used in wire and wireless communications, because of its efficient use of the frequency spectrum and good multi-path tolerance. However, the OFDM system is very sensitive to frequency offset and phase noise. In order to overcome this disadvantage, asymmetric hexagonal QAM is presented in this paper as a new modulation method to solve this problem. Without weakening the resistance to noise, an asymmetric hexagonal QAM based OFDM system is easy to get the sub-carrier frequency and it is more convenient for its synchronization. In this paper, the asymmetric hexagonal QAM based OFDM system is designed and simulated by SystemView. Then the simulation results are presented and analyzed; the properties of asymmetric hexagonal QAM and rectangular QAM are compared.

Keywords

OFDM modulation; phase noise; quadrature amplitude modulation; asymmetric hexagonal QAM based OFDM system; frequency offset; frequency spectrum; multi-path tolerance; orthogonal frequency division multiplexing; phase noise; sub-carrier frequency; synchronization; Broadcasting; Frequency conversion; Noise level; OFDM modulation; Phase noise; Propulsion; Pulse modulation; Quadrature amplitude modulation; Wire; Wireless sensor networks;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Circuits and Systems and West Sino Expositions, IEEE 2002 International Conference on

Print_ISBN

0-7803-7547-5

Type

conf

DOI

10.1109/ICCCAS.2002.1180624

Filename

1180624