Contents

#### **Preface XI**


## **Section 6 Physical Layer Security for Multi-User MIMO Communications 139**


Preface

higher data rates.

Multiple Input Multiple Output (MIMO) technology is a viable way to achieve high data rates for wireless communications. Previous researches have been done on the theoretical front and has been validated in practice. MIMO systems exploit both the diversity gain and the spatial multiplexing gain to allow for a substantial increase of spectral efficiency and

Recent focus is on extending the benefits of MIMO technology to multi-user systems. It is shown that Multi-User Multiple-Input Multiple-Output (MU-MIMO) systems achieve high data rates envisioned for 3G (3rd Generation) standards and other standards beyond 3G such as 3rd Gen‐

Chapter 1 will give information about the fundamentals of multi-user MIMO communica‐ tion. The chapter will consider the benefits of multiple antenna systems. MU-MIMO systems will be introduced and main topics including system configuration, fields of applications,

Chapter 2 will present a literature survey of the single-cell opportunistic beamforming (OBF) /random beamforming (RBF). Recent investigations on multi-cell RBF systems will be introduced and achievable rates of multi-cell RBF in finite-SNR regime will be reviewed. Different configurations including multi-cell MIMO-BC system, MISO/MIMO RBF schemes

Chapter 3 will examine the LTE and LTE-Advanced framework. This chapter will consider the interference cancellation in multi-user scenario and low-complexity interference-aware

Chapter 4 will be dedicated to multi-user interference suppression. Distributed antenna net‐ work (DAN) and conventional cellular system with centralized antennas at the BS (CAN sys‐ tem) will be considered. Single-carrier (SC) frequency domain adaptive antenna array (SC-FDAAA) for the uplink transmission will be performed for multi-user interference suppression

Chapter 5 will consider solutions for the incorporation of multi-user capabilities in IEEE 802.11n/ac for WLAN systems. This chapter will be dedicated to the study of multi-user MAC layer protocols. Multi-user mechanism included in the 802.11ac draft standard and the

Chapter 6 will survey the physical layer security for multi-user MIMO communications and suboptimal low-complexity transmission schemes will be discussed within challenging net‐

and performances of both DAN SC-FDAAA and CAN SC-FDAAA will be evaluated.

additional challenges that arise from simultaneous transmissions will be examined.

eration Partnership Project Long Term Evolution (3GPP LTE) and LTE-Advanced.

capacity region and precoding techniques will be examined.

and single-cell OBF/RBF will be presented.

receiver structure will be discussed.

works.

Chapter 7 **Lattice Reduction-Based User Selection in Multiuser MIMO Systems 159** Qiaoyu Li, Ying Li, Lin Bai and Jinho Choi
