Suppression of CW interference and noise in QPRS-systems using decision-feedback filters

Masayoshi Miyagi, Toshiaki Ogawa, Iwao Sasase, Shinsaku Mori

Research output: Contribution to journalArticlepeer-review


This paper considers the performance of quadrature partial response signaling (QPRS) systems using complex transversal filters with additional decision-feedback (DF) taps, in the presence of single continuous wave (CW) interference and colored noise. Both one- and two-sided DF filters are considered. First, the general analytic expressions are obtained for the optimum tap weights and minimum mean square errors (MSE). Next, the output signal-to-noise ratio and the frequency response of both DF filters in three types of QPRS systems, e.g., duobinary, dicode and modified duobinary system are calculated. The transient behavior of DF filters also is considered.

Original languageEnglish
Pages (from-to)102-110
Number of pages9
JournalElectronics and Communications in Japan, Part III: Fundamental Electronic Science (English translation of Denshi Tsushin Gakkai Ronbunshi)
Issue number1
Publication statusPublished - 1991 Jan

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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