Block-inversion-coded QAM systems

Author

Leung, Patrick S -K ; Feher, Kamilo

Author_Institution

Dept. of Electr. Eng., Footscray Inst. of Technol., Melbourne, Vic., Australia

Volume

36

Issue

7

fYear

1988

fDate

7/1/1988 12:00:00 AM

Firstpage

797

Lastpage

805

Abstract

A novel block inversion code (BIC) which is both simple and effective in controlling low-frequency components of multilevel data signals is introduced, and its power spectrum is analyzed. The BIC´s effect on the performance of QAM modems is studied, and an expression for the coded modem´s symbol error rate is obtained. The code allows M-ary QAM system designs to incorporate unmodulated carrier-pilot insertion techniques using high-pass filters, for more robust, unambiguous carrier recovery and automatic gain control. The effect of BIC coding on the performance of a 256 QAM modem with carrier-pilot insertion using high-pass filters is investigated. It is found that, under some circumstances, BIC coding can significantly reduce the ill-effect of the high-pass filter on the modem´s performance

Keywords

amplitude modulation; automatic gain control; codes; encoding; errors; filtering and prediction theory; high-pass filters; modems; M-ary QAM system designs; QAM modems; automatic gain control; block inversion code; carrier recovery; high-pass filters; multilevel data signals; power spectrum; symbol error rate; unmodulated carrier-pilot insertion techniques; Circuits; Degradation; Forward error correction; Frequency modulation; Gain control; Interference; Modems; Nonlinear filters; Phase noise; Quadrature amplitude modulation;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.2808

Filename

2808