Cooperative Communications in Random Access Networks - Adaptive Signal Processing in Wireless Communications - page 310

11
Cooperative
Communications
in Random
Access Networks

11.1 Introduction .......................................................... 313
11.2 Fundamentals of Cooperative
Communications .................................................. 315
11.3 Cooperation in Slotted ALOHA Random
Access Networks ................................................... 316
Slotted ALOHA in a Wireless Network • Stability
Region of the Noncooperative Slotted ALOHA
System • Cooperation in a Two-User Slotted
ALOHA System • Stability Region of the Two-
User Cooperative Slotted ALOHA System •
Cooperative Slotted ALOHA with Channel
Awareness • Performance Comparisons
11.4 Cooperation with CSMA/CA in IEEE 802
Legacy Systems ...................................................... 327
11.5 Cooperation-Enhanced Collision
Resolution Methods ............................................. 330
11.6 Asynchronous Cooperation in Multihop
Ad Hoc Networks ................................................. 333
11.7 Conclusion ............................................................. 337
References ......................................................................... 337

Y.-W. Peter Hong
National Tsing Hua
University

Shu-Hsien Wang
National Tsing Hua
University

Chun-Kuang Lin
National Tsing Hua
University

Bo-Yu Chang
National Tsing Hua
University

11.1 Introduction

Multiple-input multiple-output (MIMO) systems [1-4] have been studied extensively
in the literature to combat fading in wireless communication systems. By mounting
multiple antennas on each communication terminal and by having them placed suf-
ficiently apart on the device, each user is able to gain access to multiple independent
fading paths, which can be exploited to improve communication efficiency. With access
to the independent fading paths, diversity and multiplexing gains [5] can be achieved