NDLI: Buffer and channel adaptive transmission over fading channels with imperfect channel state information

Content Provider	IEEE Xplore Digital Library
Author	Hoang, A.T. Motani, M.
Copyright Year	2004
Description	Author affiliation: Electr. & Comput. Eng. Dept., Nat. Univ. of Singapore, Singapore (Hoang, A.T.; Motani, M.)
Abstract	We consider the problem of buffer and channel adaptive transmission over fading channels. In the model, data packets arrive stochastically into a finite-length buffer which transmits them over a time-varying correlated fading channel. We assume that knowledge of the buffer occupancy and the fading state is available at the transmitter. The objective is to vary the transmission power and rate according to the buffer and channel conditions so that the long-term system throughput is maximized under some average transmission power constraint. Here, maximizing the system throughput is equivalent to minimizing packet loss due to both buffer overflow and transmission error. We formulate this optimization problem as a Markov decision process (MDP) and use dynamic programming techniques to obtain the solution. Next, we look at the effects of error and delay in the channel state information and propose an optimal adaptive policy that is obtained by formulating a partially observable Markov decision process (POMDP). Simulation results are given to show the performance of the policies over fading channels with perfect and imperfect channel state information.
Starting Page	1891
Ending Page	1896
File Size	308321
Page Count	6
File Format	PDF
ISBN	0780383443
ISSN	15253511
DOI	10.1109/WCNC.2004.1311842
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-03-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fading Channel state information Throughput Transmitters Propagation losses Buffer overflow Bit error rate Delay estimation Dynamic programming Delay effects
Content Type	Text
Resource Type	Article

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