DocumentCode
749684
Title
On Improving Bit Error Probability of QPSK and 4-Level Amplitude Modulation Systems by Convolutional Coding
Author
Digeon, A.
Author_Institution
Computers Schlumberger, Velizy, France
Volume
25
Issue
10
fYear
1977
fDate
10/1/1977 12:00:00 AM
Firstpage
1238
Lastpage
1239
Abstract
We consider Amplitude Modulation (AM) systems, PhaseShift-Keying (PSK) and Amplitude-Phase-Keying (APK) systems in which each symbol can take 2nvalues. After a systematic search of 
binary convolutional codes with large values of free distance and minimal number of code words at that distance, simulations have been performed with an 8-symbol modulation system ( 
). For a bit error probability of less 
, the saving in average power signal-signal-to-noise ratio over that required for an uncoded system with the same channel symbol rate was more than 2 dB with PSK and APK, and 1.5 dB with AM.
binary convolutional codes with large values of free distance and minimal number of code words at that distance, simulations have been performed with an 8-symbol modulation system ( ). For a bit error probability of less , the saving in average power signal-signal-to-noise ratio over that required for an uncoded system with the same channel symbol rate was more than 2 dB with PSK and APK, and 1.5 dB with AM.Keywords
APK signal detection; ASK signal detection; Convolutional codes; PSK signal detection; Amplitude modulation; Convolution; Convolutional codes; Decoding; Error probability; History; Phase shift keying; Quadrature phase shift keying; Reflective binary codes; Signal to noise ratio;
fLanguage
English
Journal_Title
Communications, IEEE Transactions on
Publisher
ieee
ISSN
0090-6778
Type
jour
DOI
10.1109/TCOM.1977.1093732
Filename
1093732
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