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Delay-optimal hybrid ARQ protocol design for channels and receivers with memory as a stochastic
 

Summary: Delay-optimal hybrid ARQ protocol design for
channels and receivers with memory as a stochastic
control problem
Achilleas Anastasopoulos
EECS department, University of Michigan, Ann Arbor, MI, anastas@umich.edu
Abstract--Automatic repeat request (ARQ) protocols are uti-
lized as a flexible way to adapt data transmission to chan-
nel variations whenever a feedback channel is available. The
transmitter encodes the information into a packet and the
receiver attempts to decode it. If decoding is not successful,
the receiver signals the transmitter to either resend the same
information or send additional information about the data. In
this paper we consider ARQ protocols where the transmitter
controls the amount of error correction capability introduced
in the information sequence to minimize the expected delay. We
formulate this problem as a stochastic control problem and study
two cases of interest depending on whether or not the receiver
feeds back information about the channel state. Some of the
benefits of this formulation are an expression for the optimal
packet size and delay as a solution of a fixed point equation and

  

Source: Anastasopoulos, Achilleas - Department of Electrical Engineering and Computer Science, University of Michigan

 

Collections: Engineering; Computer Technologies and Information Sciences