DocumentCode
573952
Title
Research of soft decision modulations based on parallel combinatory spread spectrum system
Author
Liu, Mingduo ; Li, Honglei ; Guo, Lili
Author_Institution
Coll. of Inf. & Commun. Eng., Harbin Eng. Univ., Harbin, China
fYear
2012
fDate
27-30 May 2012
Firstpage
507
Lastpage
511
Abstract
The modulation methods are discussed in parallel combinatory spread spectrum (PCSS) system. Several modulation methods which can be demodulated without threshold judging (that is soft decision) is mainly studied. The system model is built and simulated in this paper. According to the correlation of superposition PN sequences, a new soft decision QPSK modulation in PCSS system is proposed. This simulation results show that the reliability of proposed soft decision QPSK modulation is better than that of hard decision QPSK modulation and this method is useful in engineering application.
Keywords
quadrature phase shift keying; spread spectrum communication; parallel combinatory spread spectrum system; soft decision QPSK modulation; superposition PN sequence correlation; Binary phase shift keying; Bit error rate; Correlation; Signal to noise ratio; correlation of superposition PN sequences; parallel combinatory spread spectrum system; soft decision modulation;
fLanguage
English
Publisher
ieee
Conference_Titel
Millimeter Waves (GSMM), 2012 5th Global Symposium on
Conference_Location
Harbin
Print_ISBN
978-1-4673-1302-5
Type
conf
DOI
10.1109/GSMM.2012.6314390
Filename
6314390
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