Phase errors in the coherent demodulation of VPSK and a solution using DSSS modulation

Author

Whaits, Clive V. ; Braun, Robin M.

Author_Institution

Dept. of Electr. Eng., Cape Town Univ., Rondebosch, South Africa

fYear

1997

fDate

9-10 Sep 1997

Firstpage

107

Lastpage

110

Abstract

The use of single sideband suppressed carrier (SSBSC) techniques in conjunction with digital modulation schemes, like variable phase shift keying (VPSK) places stringent phase requirements on coherent demodulation. In this paper, the problems of coherent demodulation and soft decision detection/decoding in a conventional 2-VPSK modulation scheme, with a bandwidth efficiency of 4 bits per Hertz, are discussed and then a possible solution using direct sequence spread spectrum (DSSS) modulation is presented

Keywords

decoding; digital communication; phase shift keying; signal detection; spread spectrum communication; 2-VPSK modulation scheme; DSSS modulation; VPSK; bandwidth efficiency; coherent demodulation; digital modulation schemes; direct sequence spread spectrum modulation; phase errors; phase requirements; single sideband suppressed carrier techniques; soft decision detection/decoding; variable phase shift keying; Binary phase shift keying; Bit rate; Cities and towns; Clocks; Decoding; Demodulation; Digital modulation; Optical signal processing; Phase modulation; Spread spectrum communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications and Signal Processing, 1997. COMSIG '97., Proceedings of the 1997 South African Symposium on

Conference_Location

Grahamstown

Print_ISBN

0-7803-4173-2

Type

conf

DOI

10.1109/COMSIG.1997.629991

Filename

629991