CHAPTER 21

BLIND CHANNEL ESTIMATION IN MIMO FOR MC-CDMA

ABDUR RAHIM NEMAI CHANDRA KARMAKAR

Department of Electrial and Computer Systems Engineering, Monash University, Clayton, Victoria, Australia

KAZI M. AHMED

Telecommunications Program, School of Engineering and Technology, Asian Institute of Technology, Thailand

21.1 INTRODUCTION

21.1.1 Background

Wireless communication systems are witnessing a rapid growth in the number of subscribers and in the range of services. However, the radio spectrum available for wireless services is a limited resource. A challenge for wireless technology is to meet the increase in demand for wireless services within the available spectrum. Therefore, techniques that increase spectrum efficiency are of great commercial interest. The concept of Multiple-Input Multiple-Output (MIMO) was first introduced by Jack Winters in 1987 [1] and has received great attention by researchers. MIMO architectures facilitate powerful techniques for improving the capacity of wireless communication systems, especially in rich multipath environments. Space–time coding, such as Space–Time Block Coding (STBC), relying on multiple antenna transmissions and appropriate signal processing in the receiver was proposed by Alamouti [2]. It provides diversity and interesting coding gains compared to uncoded single antenna transmissions. Thus, this new transmit diversity scheme can improve the capacity of wireless communication systems. Multicarrier transmission methods for CDMA ...

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