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Relays in wireless networks can be used to decrease transmit power while additionally increasing diversity. Distributed turbo coding as a special case of decode-and-forward is very powerful in relay networks when assuming error free decoding in the relay. In practical wireless networks, however, this assumption is only justiable if an ARQ protocol is applied which leads to lower throughput. Soft-re-encoding and transmission of the reliability of re-encoded bits helps the destination to decode the message. Re-encoding in the relay with a recursive convolutional code as used for turbo-codes, can lead to error propagation. In this paper the effects of error propagation in relay networks are investigated and more suitable distributed coding schemes are presented for soft-re-encoding.
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