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"On Improving Bit Error Probability of QPSK and 4-Level Amplitude ..."
A. Digeon (1977)
- A. Digeon:
On Improving Bit Error Probability of QPSK and 4-Level Amplitude Modulation Systems by Convolutional Coding. IEEE Trans. Commun. 25(10): 1238-1239 (1977)

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