Techniques For Detection Of Signals In Multiple Input Multiple Output

Techniques For Detection Of Signals In Multiple Input Multiple Output Communication Systems

Abstract: A receiver of a multiple-input multiple-output (MIMO) system performs QR decomposition of the channel matrix to enable detection of a transmitted vector in a layered manner. In each layer, a sub-vector of the transmitted vector is estimated. A reactive tabu search is performed if an estimated symbol differs from a nearest symbol in the alphabet by a predetermined value. The receiver may order the entries of the channel matrix prior to QR decomposition to enable estimation in an optimum order. In another embodiment, a receiver performs multiple reactive tabu searches to estimate a transmitted vector. The receiver employs a fixed threshold or a variable threshold for a cost function used in the multiple reactive tabu searches depending on whether the MIMO system is under-determined or not. The techniques enable low bit-error rate (BER) performance in MIMO systems with large number of antennas and when higher-order modulation techniques are used.

Patent Information

Application #

Filing Date

11 July 2011

Publication Number

12/2013

Publication Type

INA

Invention Field

COMMUNICATION

Status

Email

Parent Application

Applicants

INDIAN INSTITUTE OF SCIENCE

Indian Institute of Science C.V. Raman Avenue Bangalore-560012 INDIA

Inventors

1. Ananthanarayanan Chockalingam

29 AECS 2nd Stage Layout 2nd Main Nagasettihalli Bangalore Karnataka Pincode-560094 India

2. Balaji Sundar Rajan

E-19 New Housing Colony Indian Institute of Science Bangalore Karnataka Pincode-560012 India

3. Srinidhi N

Department of ECE Indian Institute of ScienceBangalore Karnataka Pincode-560012 India

4. Tanumay Datta

Department of ECE Indian Institute of ScienceBangalore Karnataka Pincode-560012 India

Specification

A receiver of a multiple-input multiple-output (MIMO) system performs QR decomposition of the channel matrix to enable detection of a transmitted vector in a layered manner. In each layer, a sub-vector of the transmitted vector is estimated. A reactive tabu search is performed if an estimated symbol differs from a nearest symbol in the alphabet by a predetermined value. The receiver may order the entries of the channel matrix prior to QR decomposition to enable estimation in an optimum order. In another embodiment, a receiver performs multiple reactive tabu searches to estimate a transmitted vector. The receiver employs a fixed threshold or a variable threshold for a cost function used in the multiple reactive tabu searches depending on whether the MIMO system is under-determined or not. The techniques enable low bit-error rate (BER) performance in MIMO systems with large number of antennas and when higher-order modulation techniques are used.

Documents

Application Documents

#	Name	Date
1	Form-1.pdf	2011-09-04
2	Drawings.pdf	2011-09-04
3	2372-CHE-2011 FORM-18 08-02-2012.pdf	2012-02-08
4	2372-CHE-2011 CORRESPONDENCE OTHERS 08-02-2012.pdf	2012-02-08
5	2372-CHE-2011 POWER OF ATTORNEY 25-05-2012.pdf	2012-05-25
6	2372-CHE-2011 CORRESPONDENCE OTHERS 25-05-2012.pdf	2012-05-25
7	2372-CHE-2011 FORM -3 12-10-2012.pdf	2012-10-12
8	2372-CHE-2011 CORRESPONDENCE OTHERS 12-10-2012.pdf	2012-10-12
9	2372-CHE-2011 FORM-3 11-02-2013.pdf	2013-02-11
10	2372-CHE-2011 CORRESPONDENCE OTHERS 11-02-2013.pdf	2013-02-11
11	2372-CHE-2011-FER.pdf	2018-02-01
12	2372-CHE-2011-AbandonedLetter.pdf	2018-08-28

Search Strategy

1	2372_CHE_2011_20-12-2017.pdf