Green Communications: Principles, Concepts and Practice

Chapter 7Green Radio

Taewon Hwang¹, Guowang Miao², Hyunsung Park¹, Younggap Kwon¹ and Nageen Himayat³

¹Yonsei University, Department of Electrical and Electronic Engineering, Seoul, Korea

²KTH Royal Institute of Technology, Communications Department, Stockholm, Sweden

³Intel Corporation, Intel Labs, Santa Clara, USA

7.1 Energy-Efficient Design for Single-User Communications

Shannon theory provides some insights into the fundamental limits on minimum energy per bit required for reliable transmission for a single-user link. Based on the Shannon capacity formula, the data rate of an ideal band-limited additive white Gaussian noise (AWGN) channel is given as follows:

where is the channel bandwidth, the transmission power, the channel power gain, and the noise spectral density. From a system-design perspective, and are usually given and and can be controlled by an appropriate transceiver ...