Perfect 8-QAM+ Sequences

Author

Zeng, Fanxin ; Zeng, Xiaoping ; Zeng, Xiangyong ; Zhang, Zhenyu ; Xuan, Guixin

Author_Institution

Coll. of Commun. Eng., Chongqing Univ., Chongqing, China

Volume

1

Issue

4

fYear

2012

fDate

8/1/2012 12:00:00 AM

Firstpage

388

Lastpage

391

Abstract

This letter investigates the construction methods of perfect 8-QAM+ sequences, which relate to one of three open problems proposed by Boztas and Parampalli in 2010, and two constructions that transform the known perfect ternary sequences (PTSs) into the required sequences are presented. The resultant sequences and the employed sequences have the same period, or the former´s length is twice as long as the latter´s, depending on the differently proposed methods. In addition, the simulation results by a computer show that energy efficiency of the proposed sequences in Construction 2 is higher than that of the employed PTSs. Incidentally, one of our constructions can also produce a family of almost perfect 8-QAM+ sequences with only two nonzero nontrivial autocorrelation values.

Keywords

quadrature amplitude modulation; radio networks; PTS; construction 2; energy efficiency; nonzero nontrivial autocorrelation value; perfect 8-QAM sequence; perfect ternary sequences; Computers; Correlation; Educational institutions; Energy loss; Quadrature amplitude modulation; Simulation; Wireless communication; Boztas and Parampalli's open problems; QAM+ constellation; energy efficiency; perfect sequences;

fLanguage

English

Journal_Title

Wireless Communications Letters, IEEE

Publisher

ieee

ISSN

2162-2337

Type

jour

DOI

10.1109/WCL.2012.053112.120319

Filename

6211388