PARTIALLY COHERENT CONSTELLATIONS FOR MULTIPLE-ANTENNA SYSTEMS

Title:

PARTIALLY COHERENT CONSTELLATIONS FOR MULTIPLE-ANTENNA SYSTEMS

Document Type and Number:

WIPO Patent Application WO2004107768

Kind Code:

A3

Abstract:

A signal constellation (50) for a multiple input/multiple output (MIMO communication system (20) when channel knowledge at the receiver is imperfect includes at least two (n-1)-dimensional sub-constellations of points that together form an ndimensional constellation (50), the number n representing real dimensions and n=2M where M is the number of transmit antennas (26). The n-dimensional spherical constellation (50) may define a single sphere or a plurality of concentric subset spheres, and points between subsets are separated by a Kullback-Leibler distance rather than a Euclidian distance. Each sphere has sub-constellations that preferably are arranged in symmetric pairs that define equal numbers of points that lie in parallel planes, to allow recursive construction that minimizes computational complexity. An appropriate constellation may be chosen by ceasing a search once the optimum distance stops increasing as a number of the concentric levels increases.

Inventors:

BORRAN MOHAMMAD JABER
SABHARWAL ASHUTOSH
AAZHANG BEHNAAM
VARSHNEY PRABODH

Application Number:

PCT/IB2004/001566

Publication Date:

May 19, 2005

Filing Date:

May 14, 2004

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NOKIA CORP (FI)
NOKIA INC (US)

International Classes:

H04L1/02; H04L1/06; H04L25/02; H04Q; (IPC1-7): H04L1/02

Foreign References:

US20010031019A1	2001-10-18
US20030123877A1	2003-07-03
US20030210824A1	2003-11-13
US20020114378A1	2002-08-22
US4891823A	1990-01-02

Other References: