Policy allocation for transmission of embedded bit streams over noisy channels with feedback

Authors:
Jinshi Qiu;Amir H. Banihashemi
Affiliations:
RIM, Waterloo, Ontario, Canada and Broadband Communications and Wireless Systems Centre, Dept. of Systems and Computer Engineering, Carleton University, Ottawa, Ontario, Canada;Broadband Communications and Wireless Systems Centre, Dept. of Systems and Computer Engineering, Carleton University, Ottawa, Ontario, Canada
Venue:
IEEE Transactions on Communications
Year:
2009

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Abstract

An efficient policy allocation algorithm for the transmission of embedded bit streams over noisy channels with feedback is proposed. The transmission is based on the type-II hybrid ARQ/FEC protocol and uses a nested sequence C of channel codes to protect the packets. There are also constraints on the total bit budget and on the allowed number of retransmissions per packet. The allocation algorithm assigns different protection policies, each policy being a subset of C, to different packets to maximize the average number of correctly received source bits. We study the performance and the complexity of the proposed scheme through the transmission of images encoded by JPEG2000 over mobile channels with correlated Rayleigh fading. We demonstrate by simulations that the proposed multiplepolicy scheme provides significant improvements over a purely FEC scheme with no feedback and also the existing fixed-policy schemes. Our results show that feedback is particularly helpful for poor channel conditions and that the proposed scheme is very robust against changes in the channel signal-to-noise ratio (SNR) and the mobile speed.