ETHZ > EE Dept > Comm Tech Lab > Comm Theory Group > Publications >

Algorithms for interpolation-based QR decomposition in MIMO-OFDM systems

Authors

Davide Cescato and Helmut Bölcskei

Reference

IEEE Transactions on Signal Processing, Vol. 59, No. 4, pp. 1719-1733, Apr. 2011

DOI: 10.1109/TSP.2010.2104149

[BibTeX, LaTeX, and HTML Reference]

Abstract

Detection algorithms for multiple-input multiple-output (MIMO) wireless systems based on orthogonal frequency-division multiplexing (OFDM) typically require the computation of a QR decomposition for each of the data-carrying OFDM tones. The resulting computational complexity will, in general, be significant. Motivated by the fact that the channel matrices arising in MIMO-OFDM systems result from oversampling of a polynomial matrix, we formulate interpolation-based QR decomposition algorithms. An in-depth complexity analysis, based on a metric relevant for very large scale integration (VLSI) implementations, shows that the proposed algorithms, for a sufficiently large number of data-carrying tones and sufficiently small channel order, provably exhibit significantly smaller complexity than brute-force per-tone QR decomposition.

Keywords

Interpolation, polynomial matrices, multiple-input multiple-output (MIMO) systems, orthogonal frequency-division multiplexing (OFDM), QR decomposition, sphere decoding, successive cancelation, very large scale integration (VLSI)

Download this document:

Copyright Notice: © 2011 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.