Modified 128-QAM constellation schemes allowing low complexity non-data-aided carrier recovery

Author

Hou, Hsin-An

Author_Institution

Comput. & Commun. Res. Lab., Ind. Technol. Res. Inst., Hsinchu

Volume

4

fYear

2005

fDate

11-14 Sept. 2005

Firstpage

2557

Abstract

Squared M-ary quadrature amplitude modulation (QAM) constellations have been widely adopted for modern high-data-rate digital communications. Nevertheless, carrier recovery required by demodulation of 128-QAM signals is almost a formidable task for practical receiver design. In this paper, two types of modified 128-QAM constellations are proposed allowing utilization of a low-complexity carrier recovery mechanism in the receiver. With the proposed constellations, perfect recovery of a frequency offset up to plusmn2.5% of baud rate is guaranteed using a conventional carrier recovery method at the expense of slight E_s/N₀ and PAPR increment compared with the conventional 128-QAM constellations

Keywords

demodulation; digital communication; quadrature amplitude modulation; receivers; 128-QAM constellation; PAPR; carrier recovery; demodulation; high-data-rate digital communication; receiver design; squared M-ary quadrature amplitude modulation; Communication standards; Demodulation; Digital communication; Digital video broadcasting; Frequency estimation; Maximum likelihood estimation; Peak to average power ratio; Phase estimation; Quadrature amplitude modulation; Viterbi algorithm; carrier frequency offset; carrier recovery; quadrature amplitude modulation (QAM) constellations; synchronization;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 2005. PIMRC 2005. IEEE 16th International Symposium on

Conference_Location

Berlin

Print_ISBN

9.7838007291e+012

Type

conf

DOI

10.1109/PIMRC.2005.1651905

Filename

1651905