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Energy-delay tradeoff comparison of transmission schemes with limited CSI feedback

journal contribution
posted on 2013-04-01, 00:00 authored by Jinho ChoiJinho Choi
Due to increasing energy cost and various environmental issues, energy efficiency becomes an important issue in wireless communications where spectral efficiency has been considered as a key performance measure. If transmission schemes can be flexible to allow varying average transmission delay (or throughput), the energy-delay tradeoff (EDT) can be exploited. In general, the longer (average) transmission delay, the better energy efficiency can be achieved. In this paper, we study various transmission schemes with limited channel state information (CSI) feedback that can have flexible transmission delay in wireless communications, including hybrid automatic repeat request (HARQ) protocols, and derive EDT characteristics over fading channels. An opportunistic transmission scheme that relies on prior CSI feedback is studied for comparisons with HARQ protocols in terms of EDT. In order to improve the energy efficiency of HARQ, a modified transmission scheme that employs prior CSI feedback is proposed and analyzed to understand its EDT characteristics. © 2002-2012 IEEE.

History

Journal

IEEE transactions on wireless communications

Volume

12

Pagination

1762-1773

Location

Piscataway, N.J.

ISSN

1536-1276

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2013, IEEE

Issue

4

Publisher

IEEE