Spatial Multiplexing for MIMO Wireless Channels—Overview and New Results

Abstract

In this paper, we present a study of the wireless system employing spatial multiplexing and diversity reception. The FDR performance of this system is studied for various channel models and compared with that of a single transmitter system with diversity reception. We can find from the simulation results that spatial multiplexing is an efficient way of improving the capacity of a wireless channel when the channel has a rich multipath structure. However, when the channel has correlated multipath, the performance of spatial multiplexing degrades, making single transmission a suitable technique for such situations.

Indexing terms:

• Spatial multiplexing
• Diversity
• FDR
• Multipath

Additional information

Notes on contributors

Ramya Ramachandran

Ramya Ramachandran received the BE degree in Electronics and Communication Engineering from Anna University, Chennai in 1999 and the MS degree from the Indian Institute of Technology Madras in 2002. She is currently working as a Consultant, Research associate at HP-IITM R&D Labs. Her research interests are in the areas of DSP and wireless communications.

K Giridhar

K Giridhar received the B Sc (Applied Sciences) degree from PSG College of Technology, Coimbatore, in 1985, and the ME degree in Electrical Communication Engineering from Indian Institute of Science, Bangalore, in 1989, and the PhD degree in Electrical and Computer Engineering from University of California, Santa Barbara, CA, in 1993.

He has also worked for a year each, as a Member of Research Staff in Bharat Electronics, Bangalore, and as a Research Affiliate in Electrical Engineering at Stanford University, California. In 1994, he joined the Indian Institute of Technology, Madras, and currently is an Associate Professor of Electrical Engineering. His present research interests are in the areas of noncoherent and multiuser detection, space-time processing, adaptive estimation, and various transceiver algorithm for 3G and 4G wireless systems. He is involved in telecommunication product development activity based on the DECT Wireless in Local Loop system developed by IITM. He has also been a visiting faculty at Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam, Andhra Pradesh, and at Stanford University, California.