Construction of non-square M-QAM sequences with low PMEPR for OFDM systems

Author

Sadjadpour, H.R.

Author_Institution

Dept. of Electr. Eng., Univ. of California, Santa Cruz, CA, USA

Volume

151

Issue

1

fYear

2004

fDate

2/1/2004 12:00:00 AM

Firstpage

20

Lastpage

24

Abstract

The author considers the use of coding to reduce the peak-to-mean envelope power ratio (PMEPR) for orthogonal frequency division multiplexing (OFDM) systems. Most of the existing schemes that use coding for PMEPR reduction assume a PSK constellation. The author presents the construction of non-square M-QAM symbols from a combination of QPSK and BPSK signals when M=2ⁿ and n is an odd number. By using QPSK and BPSK Golay (or Golay-like) sequences, M-QAM sequences with low PMEPR are generated. An upper bound for the instantaneous envelope power of Golay-like M-QAM sequences was derived. After the mean envelope power for these sequences was computed, the general upper bound for one PMEPR of M-QAM sequences with non-square constellations was derived.

Keywords

Golay codes; OFDM modulation; m-sequences; quadrature amplitude modulation; quadrature phase shift keying; sequential codes; BPSK Golay sequence signal; Golay-like M-QAM sequence; OFDM system; PSK constellation; QPSK Golay sequence signal; coding; low peak-to-mean envelope power ratio; nonsquare M-QAM symbol construction; orthogonal frequency division multiplexing;

fLanguage

English

Journal_Title

Communications, IEE Proceedings-

Publisher

iet

ISSN

1350-2425

Type

jour

DOI

10.1049/ip-com:20040404

Filename

1275395