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Conditions for 90° phase-invariant block-coded QAM

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1 Author(s)
Henkel, W. ; Res. Center, Deutsche Bundespost Telekom, Darmstadt, Germany

Based on V.A. Zinoviev's (1981) generalized concatenated codes, conditions for the construction of 90° phase-invariant QAM are derived. Furthermore, a proposal for the necessary differential encoding/decoding is made. The conditions for phase invariance are specialized for the case of Reed-Muller codes as outer codes of the generalized concatenation

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Communications, IEEE Transactions on  (Volume:41 ,  Issue: 4 )