Further results on convolutional codes derived from block codes

Some new techniques to derive convolutional codes from block codes are given. The techniques given result in convolutional codes with more than one information position per block having a higher efficiency than the straightforward application of the earlier algorithms. Short high-rate convolutional codes can be formed this way. Decoding schemes and analysis techniques to study error propagation in the proposed codes are given. Most of the codes exhibit limited error propagation