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
Link To Document :
