Variable-Length Feedback Codes Under a Strict Delay Constraint

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We study variable-length feedback (VLF) codes under a strict delay constraint to maximize their average transmission rate (ATR) in a discrete memoryless channel (DMC) while considering periodic decoding attempts. We first derive a lower bound on the maximum achievable ATR, and confirm that the VLF code can outperform non-feedback codes with a larger delay constraint. We show that for a given decoding period, as the strict delay constraint, L, increases, the gap between the ATR of the VLF code and the DMC capacity scales at most on the order of O(L-1) instead of O(L-1/2) for non-feedback codes as shown in Polyanskiy et al. ["Channel coding rate in the finite blocklength regime,"IEEE Trans. Inf. Theory, vol. 56, no. 5, pp. 2307-2359, May 2010]. We also develop an approximation indicating that, for a given L, the achievable ATR increases as the decoding period decreases.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2015-04
Language
English
Article Type
Article
Keywords

REGIME

Citation

IEEE COMMUNICATIONS LETTERS, v.19, no.4, pp.513 - 516

ISSN
1089-7798
DOI
10.1109/LCOMM.2015.2398866
URI
http://hdl.handle.net/10203/200999
Appears in Collection
EE-Journal Papers(저널논문)
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