Channel Estimation and Equalization Techniques in Downsampled ARQ Systems
Roberson, J.
Xiaofei Dong
Zhi Ding
Dept. of Electr. & Comput. Eng., California Univ., Davis, CA;
This paper appears in: Signal Processing, IEEE Transactions on
Publication Date: May 2007
Volume: 55,
Issue: 5, Part 2
On page(s): 2251-2262
ISSN: 1053-587X
INSPEC Accession Number: 9427748
Digital Object Identifier: 10.1109/TSP.2007.893203
Current Version Published: 2007-04-23
Abstract
In this paper, we study channel estimation and equalization for a class of bandwidth efficient automatic repeat request (ARQ) systems. In these systems, retransmissions achieve bandwidth efficiency through symbolwise downsampling. Unlike a standard ARQ scheme, in which an erroneous packet is fully repeated, more sophisticated hybrid ARQ systems retransmit a recoded data packet. However, many of these ARQ schemes do not consider the integration of ARQ protocols with receiver signal processing such as channel estimation and signal detection. In this paper, we present a joint multichannel estimation algorithm that exploits the structure of a symbolwise downsampled ARQ equipped network. We show that this new method can improve the identifiability conditions for channel estimation as well as the overall system performance
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