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This paper deals with iterative decoding of product codes for high spectral efficiency transmissions. A solution is proposed to adapt the decoding algorithm to the characteristics of the encoder, the modulation and the number of decoding steps. A coding gain of up to 2 dB is then obtained for short codes. For long codes, the number of decoding steps to achieve a specified bit error rate (BER) can be reduced by 1 or 2, which is interesting in terms of decoding latency and power consumption.