NDLI: MIMO/OFDM with adaptive interleaved beamforming and power allocation for high-capacity wireless access

Content Provider	IEEE Xplore Digital Library
Author	Ya-Han Pan Letaief, Khaled Ben Zhigang Cao
Copyright Year	2004
Description	Author affiliation: Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon, China (Ya-Han Pan; Khaled Ben Letaief)
Abstract	Spatial diversity at both the transmitter and receiver has been widely regarded as a key technique with which OFDM can be combined to improve further the system performance of wireless networks. Selection diversity is the simplest way to realize spatial diversity, but the performance improvement of this form of diversity is limited. Adaptive antenna arrays can provide significant increases in a system's capacity and performance, but they are characterized by a relatively higher implementation complexity than selection diversity. We combine the benefits of these two spatial diversity methods and propose an adaptive interleaved beamforming approach for broadband MIMO/OFDM systems. By applying eigenvalue decomposition on the set of all available channel correlation matrices, the best beamforming which corresponds to the largest eigenvalue in the set is adaptively selected for each sub-carrier. By doing so, beamforming is adaptively interleaved in the spatial domain. Simulation results show that the proposed system can result in significant performance improvements over conventional adaptive antenna array based OFDM systems in wireless channels. Numerical results also show that the performance of the proposed system can be further greatly improved by employing interleaved-beamforming-dependent power allocation among the sub-carriers.
Starting Page	1906
Ending Page	1910
File Size	345565
Page Count	5
File Format	PDF
ISBN	0780382552
ISSN	15502252
DOI	10.1109/VETECS.2004.1390605
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-05-17
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MIMO OFDM Array signal processing Diversity methods Adaptive arrays Antenna arrays Eigenvalues and eigenfunctions Transmitters System performance Wireless networks
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Electrical and Electronic Engineering Computer Science Applications

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