Chapter 3
Green Relay Techniques in
Cellular Systems
Yinan Qi, Fabien H´eliot, Muhammad Ali Imran and Rahim Tafazolli
University of Surrey, yinan.qi@surrey.ac.uk
3.1 Introduction .................................................... 60
3.2 Spectrum and Energy Efficiency Analysis of Relay-Assisted
Systems ......................................................... 64
3.2.1 System Model .......................................... 66
3.2.2 Spectrum Efficiency Analysis .......................... 67
3.2.3 Energy Efficiency Analysis ............................. 71
3.2.4 Insights and Discussions ............................... 76
3.3 H-ARQ Relaying and H
2
-ARQ Relaying ....................... 78
3.3.1 H
2
-ARQ Relaying Strategy ............................ 79
3.3.2 Performan ...