Low-complexity, low-regret link rate selection in rapidly varying wireless channels

Gupta, Harsh

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https://hdl.handle.net/2142/99200 Copy

Description

Title

Low-complexity, low-regret link rate selection in rapidly varying wireless channels

Author(s)

Gupta, Harsh

Issue Date

2017-11-10

Director of Research (if dissertation) or Advisor (if thesis)

Srikant, Rayadurgam

Department of Study

Electrical & Computer Eng

Discipline

Electrical & Computer Engr

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• Link rate selection
• Thompson sampling
• Regret minimization
• Computational complexity

Abstract

We consider the problem of transmitting at the optimal rate over a rapidly varying wireless channel with unknown statistics when the feedback about channel quality is very limited. One motivation for this problem is that, in emerging wireless networks, the use of mmWave bands means that the channel quality can fluctuate rapidly and thus, one cannot rely on full channel-state feedback to make transmission rate decisions. Inspired by related problems in the context of multi-armed bandits, we consider a well-known algorithm called Thompson sampling to address this problem. However, unlike the traditional multi-armed bandit problem, a direct application of Thompson sampling results in a computational and storage complexity that grows exponentially with time. Therefore, we propose an algorithm called modified Thompson sampling (MTS), whose computational and storage complexity is simply linear in the number of channel states and which achieves at most logarithmic regret as a function of time when compared to an optimal algorithm which knows the probability distribution of the channel states.

Graduation Semester

2017-12

Type of Resource

text

Permalink

http://hdl.handle.net/2142/99200

Copyright and License Information

Copyright 2017 Harsh Gupta

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