**Meet the editor**

Sameh Gobriel received his BE in Electronics and Electrical Communications Engineering from Cairo University in 1999, the MS and the PhD degree in computer science from the University of Pittsburgh in 2007 and 2008, respectively. He is a senior research scientist at Intel Labs where he drives research to enable future products to be best-in-class in energy-efficient performance. His research

interests include energy-efficient design of computer platforms, wireless data networks, adhoc networks and sensor networks, fault-tolerant design and large scale networks. Dr. Gobriel is the author of more than 30 research papers and articles in first tier conferences and journals; he has 14 filed technology patents. He is the recipient of three career awards and he has served on the program committees of numerous conferences and workshops.

Contents

**Preface VII** 

Chapter 1 **Self-Cancellation of Sampling** 

**Frequency Offsets in STBC-OFDM Based Cooperative Transmissions 1**  Zhen Gao and Mary Ann Ingram

**and Mixed Signal Integrated Circuit Design 23**  E. López-Morillo, F. Márquez, T. Sánchez-Rodríguez,

**Underwater Wireless Sensors Networks 47** 

**Platforms in Presence of Background Traffic 71** 

**802.11 and DRX Mechanism of LTE-A Networks 85**  Kuo-Chang Ting, Hwang-Cheng Wang, Fang-Chang Kuo,

**Wireless Sensor Networks:** *NRG-WiSe Building* **117**  I. Foche, M. Chidean, F.J. Simó-Reigadas, I. Mora-Jiménez, J.L. Rojo-Álvarez, J. Ramiro-Bargueno and A.J. Caamano

Chapter 2 **Achieving Energy Efficiency in Analogue** 

C.I. Luján-Martínez and F. Munoz

Ammar Babiker and Nordin Zakaria

Sameh Gobriel, Christian Maciocco and Tsung-Yuan Charlie Tai

Chapter 5 **The Energy Efficient Techniques in the DCF of** 

Chih-Cheng Tseng and Ping Ho Ting

Chapter 6 **Monitoring Energy Efficiency in Buildings with** 

Chapter 4 **Energy Efficiency of Connected Mobile** 

Chapter 3 **Energy Efficient Communication for** 

## Contents

#### **Preface** XI


J.L. Rojo-Álvarez, J. Ramiro-Bargueno and A.J. Caamano

Preface

vital topics.

communication technologies.

The field of information and communication technologies continues to evolve and grow in both the research and the practical domains. However, energy efficiency is an aspect in communication technologies that until recently was only considered for embedded, mobile or handheld battery constraint devices. Today, and driven by cost and sustainability concerns about the energy and carbon footprint of the IT infrastructure we see energy efficiency becoming a pervasive issue that is considered in all information technology areas starting at the circuit level to device architecture

Reducing the energy consumption of networks and communication devices has always been, and presumably will stay, a significant challenge for the designers, developers and the operators. This challenge is mainly because of the typical tradeoff between striving for always achieving a better performance to cope with the growing workload demand and the increased energy consumption associated with these performance guarantees. With energy consumption becoming an increasingly important design criterion, new techniques, designs and algorithms are needed to

Looking toward the future, it is evident that the use of networks and communication technologies will continue to grow exponentially with more users adopting them every day and more innovative usages being developed continuously to the extent that these technologies are transformed into a commercial commodity. As a result, quantifying, understanding and improving their energy footprint are very timely and

This book contains six chapters authored by a group of internationally well know experienced researchers. It is designed to cover a wide range of topics and to reflect the present state of the art in the field of energy-efficiency for networks and

Circuits and Systems Research Lab, Intel Labs, Intel Corporation

**Sameh Gobriel** 

USA

and platforms to the system level of whole datacenters management.

optimize this tradeoff between energy consumption and performance.
