Title:
APPARATUS AND METHOD FOR UPLINK CLOSED LOOP TRANSMIT DIVERSITY
Document Type and Number:
WIPO Patent Application WO/2012/096973
Kind Code:
A3
Abstract:
An apparatus, method, and computer program product operable to determine a phase of a beamforming weight vector utilizing a memory of a previously used phase for the beamforming weight vector, capable of improving a channel estimate. A base station (320) transmits a beamforming weight vector to a user equipment (310) based on a determined channel estimate. The user equipment (310) selects between the received beamforming weight vector, or a modified beamforming weight vector having its phase shifted by -360, in accordance with a suitable selection criteria. That is, the selection is made such that a difference between the phase of the selected beamforming vector and a phase of a prior beamforming vector is within a predetermined range.
Inventors:
JIANG YIBO (US)
SAMBHWANI SHARAD DEEPAK (US)
HOU JILEI (CN)
SAMBHWANI SHARAD DEEPAK (US)
HOU JILEI (CN)
Application Number:
PCT/US2012/020799
Publication Date:
October 04, 2012
Filing Date:
January 10, 2012
Export Citation:
Assignee:
QUALCOMM INC (US)
JIANG YIBO (US)
SAMBHWANI SHARAD DEEPAK (US)
HOU JILEI (CN)
JIANG YIBO (US)
SAMBHWANI SHARAD DEEPAK (US)
HOU JILEI (CN)
International Classes:
H04B7/06; H04L25/02
Foreign References:
| US20100246516A1 | 2010-09-30 | |||
| US7561850B2 | 2009-07-14 | |||
| US20080311858A1 | 2008-12-18 |
Other References:
HUAWEI: "Uplink Close Loop Transmit Diversity for HSPA", 3GPP DRAFT; R1-104750 UPLINK CLTD FOR HSPA, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Madrid, Spain; 20100823, 19 August 2010 (2010-08-19), XP050450199
QUALCOMM INCORPORATED: "On the benefits of Uplink Closed Loop Transmit Diversity", 3GPP DRAFT; R1-104737_ON THE BENEFITS OF UL CLTD, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Madrid, Spain; 20100823, 17 August 2010 (2010-08-17), XP050449978
QUALCOMM INCORPORATED: "Link Analysis of mechanisms to improve impact of phase discontinuity due to CLTD on NodeB receiver", 3GPP DRAFT; R1-111099_LINK_ANALYSIS_PHASE_DISCONTINUITY_IMPACT_NODEB_RX, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Taipei, Taiwan; 20110221, 24 February 2011 (2011-02-24), XP050490851
QUALCOMM INCORPORATED: "On the benefits of Uplink Closed Loop Transmit Diversity", 3GPP DRAFT; R1-104737_ON THE BENEFITS OF UL CLTD, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Madrid, Spain; 20100823, 17 August 2010 (2010-08-17), XP050449978
QUALCOMM INCORPORATED: "Link Analysis of mechanisms to improve impact of phase discontinuity due to CLTD on NodeB receiver", 3GPP DRAFT; R1-111099_LINK_ANALYSIS_PHASE_DISCONTINUITY_IMPACT_NODEB_RX, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Taipei, Taiwan; 20110221, 24 February 2011 (2011-02-24), XP050490851
Attorney, Agent or Firm:
JUNEAU, Darrell Scott (5775 Morehouse DriveSan Diego, California, US)
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