Title:
METHOD AND APPARATUS FOR TRANSMITTING DEMODULATION PILOTS IN A MULTI ANTENNA WIRELESS COMMUNICATION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2013/169201
Kind Code:
A3
Abstract:
Multiple antennas employed at transmitting and receiving nodes (510, 520) can significantly increase a MIMO system capacity, especially when the geometry of the receiving node (520) is high. The transmitting node (520) can determine geometry by transmitting common pilots (which may include legacy and non-legacy common pilots) and receiving feedback from the receiving node (520) based on the common pilots. The geometry can also be determined through measuring uplink signals from the receiving node (520). If the geometry is high enough, the transmitting node (510) may transmit demodulation pilot(s) in addition to the common pilots. The demodulation pilot transmission may be concurrent with data transmission. The receiving node (520) can use the demodulation pilot(s) to estimate the channel for demodulating the data received from the transmitting node (510). The transmitting node (510) may notify the receiving node (520) to monitor for the demodulation pilot(s) through a configuration message sent over a control channel.
Inventors:
NAMMI SAIRAMESH (SE)
Application Number:
PCT/SE2013/050525
Publication Date:
January 03, 2014
Filing Date:
May 08, 2013
Export Citation:
Assignee:
ERICSSON TELEFON AB L M (SE)
International Classes:
H04L5/00; H04B7/04
Domestic Patent References:
| WO2010145254A1 | 2010-12-23 | |||
| WO2011124147A1 | 2011-10-13 |
Foreign References:
| US20060062322A1 | 2006-03-23 | |||
| US20070242766A1 | 2007-10-18 |
Attorney, Agent or Firm:
AYOUB, Nabil (Patent Unit Kista RAN2, Stockholm, SE)
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