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| The cycles property of time-varying LDPC-CCs is superior to that of time-invariant LDPC-CCs. The concept of transformed LDPC-CCs, which can be considered as the time-varying version of the non-transformed one, is introduced. Based on the weight matrix of the transformed code, a family of LDPC-CCs with improved cycle properties is obtained. When the syndrome former memory is large, the enumerators for the short cycles of the designed LDPC-CCs are optimized, i.e., the number of short cycles is minimized. |
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| Keywords:Communication and information system; LDPC convolutional codes; short cycles; transformed codes; code design |
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