Superimposed asymmetric modulation in narrowband fading channels using orthogonal codes

Author

Poon, S.W.L. ; Plataniotis, K.N. ; Pasupathy, S.

Author_Institution

Dept. of Electr. & Comput. Eng., Toronto Univ., Ont.

Volume

5

Issue

6

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

1260

Lastpage

1265

Abstract

The asymmetric signal constellation (ASC) method to break isometry is analyzed in a superimposed symbol framework with a Kalman filter estimator (KF) / maximum-likelihood (ML) detector as the receiver. Direct application of the ASC method led to a bit error floor, which motivates the proposal of combining orthogonal spreading codes with ASC to solve this problem. The proposed scheme generalizes previously proposed ASC and pilot-assisted solutions in a systematic way and results in coherent detection schemes without set bit error floors and better performance

Keywords

Kalman filters; channel coding; fading channels; maximum likelihood detection; modulation coding; Kalman filter estimator; maximum-likelihood detector; narrowband fading channels; orthogonal spreading codes; superimposed asymmetric modulation; AWGN; Bit error rate; Channel estimation; Fading; Maximum likelihood detection; Maximum likelihood estimation; Modulation coding; Narrowband; Phase shift keying; Time division multiplexing;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2006.1638645

Filename

1638645