US 8,009,580 B2Granted

Signaling and training for antenna selection in OFDMA networks

AssigneeMitsubishi Electric Research Laboratories, Inc.

InventorsZhifeng Tao, Andreas F. Molisch, Philip V. Orlik, Jinyun Zhang, Shigeru Uchida, Kentarou Sawa

Life of this patent

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Abstract

A method selects antennas in an OFDMA wireless network including a base station and a mobile station. The mobile station measures a channel state of a downlink in a downlink subframe using different subsets of available antennas, and selects a subset of receive antennas for downlink reception based on the channel states between the base station and the different subsets of antennas at the mobile station. The base station measures the channel state in an uplink using an uplink subframe received in the base station from the mobile station, and selects a subset of transmit antennas for mobile station's uplink transmission based on the channel states between the base station and different subset of antennas at the mobile station.

Claims13

Dependent claims

A method for selecting antennas in an OFDMA wireless network including a base station and a mobile station having a available antennas, comprising:

measuring, by the mobile station, channel states of a downlink channel using a downlink subframe received in the mobile station from the base station using different subsets of the available antennas, in which each subset has an associated index, and each antenna has an associated identity;
selecting, by the mobile station, a subset of receive antennas for downlink reception based on the channel states between the base station and the different subsets of antennas at the mobile station;
measuring, by the base station, a channel state of an uplink channel using an uplink subframe received in the base station from the mobile station;
and
selecting, by the base station, a subset of transmit antennas at the mobile station for uplink transmission based on the channel states between the base station and different subset of antennas at the mobile station.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/117,219Filed 8 May 2008 · continuation in part
Priority: 13 Jul 2007
Published: US 2009/0016312 A115 Jan 2009
Granted: 30 Aug 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04B 7/0874
Hybrid systems, i.e. switching and combining: using subgroups of receive antennas
H04B 7/0691
Hybrid systems, i.e. switching and simultaneous transmission: using subgroups of transmit antennas
H04L 5/0007
Time-frequency: the frequencies being orthogonal, e.g. OFDM or DMT
H04B 7/063
Feedback content: parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection

Family

Application11/777,356Parent of this continuation-in-part · filed 13 Jul 2007
Application61/035,105Us provisional application · filed 10 Mar 2008
US 2009/0016372 A1Pre-grant publication · published 15 Jan 2009
US 7,756,099 B2Parent of this continuation-in-part
US 2009/0016312 A1Published application
US 8,009,580 B2This patent

From the US filing history. Foreign family members aren’t listed.