On Walsh filtering method for decoding of CPM signals

Author

Fu, Minyue ; Wade, Graham ; Ning, Jun ; Jakobs, Robert

Author_Institution

Sch. of Electr. Eng. & Comput. Sci., Univ. of Newcastle, NSW, Australia

Volume

8

Issue

6

fYear

2004

fDate

6/1/2004 12:00:00 AM

Firstpage

345

Lastpage

347

Abstract

Walsh filtering has been used as a method to reduce receiver complexity in several coding and modulation systems, especially in continuous phase modulation systems. In this paper, we show that its lowpass filtering ability is poor and alias components arising from an adjacent channel can significantly degrade the maximum-likelihood decoding. Instead, a lowpass filtering method is more robust against adjacent channel interference and thus gives less decoding errors than the Walsh filtering method.

Keywords

Walsh functions; adjacent channel interference; continuous phase modulation; low-pass filters; maximum likelihood decoding; maximum likelihood detection; radio receivers; Walsh filtering method; adjacent channel interference; continuous phase modulation system; decoding error; lowpass filtering method; maximum-likelihood decoding; maximum-likelihood detection; receiver complexity; signal detection; Continuous phase modulation; Degradation; Filtering; Filters; Frequency; Interchannel interference; Maximum likelihood decoding; Maximum likelihood detection; Modulation coding; Robustness;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2004.828184

Filename

1306415