Joint semi-blind channel identification in punctured ARQ retransmissions
Roberson, J.; Zhi Ding
Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP apos;04). IEEE International Conference on
Volume 2, Issue , 17-21 May 2004 Page(s): ii - 421-4 vol.2
Digital Object Identifier   10.1109/ICASSP.2004.1326284
Summary: We study the channel estimation of a bandwidth efficient automatic repeat request (ARQ) system in which re-transmissions are symbol or bit-wise punctured. Unlike simple ARQ in which an erroneous packet is retransmitted, many hybrid ARQ systems aim to conserve bandwidth by only retransmitting a punctured or recoded data packet. We formulate a joint semi-blind channel estimation algorithm for the punctured retransmission in a hybrid ARQ network. We show that the joint semi-blind estimation is quite simple and naturally combines training in the first transmission with retransmitted data statistics. We show that bandwidth savings resulting from puncturing the retransmission only lead to a marginal degradation to the accuracy of channel estimation.

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