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A method and apparatus for using factorized precoding

A precoding and precoding technology, applied in the field of transmission signal precoding, can solve problems such as improper feedback overhead

Active Publication Date: 2013-03-06
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] One problem associated with closed-loop precoding is the feedback overhead caused by signaling the precoder matrix indicator (PMI) and precoder rank indicator (i.e., RI) - especially when there are many channel dimensions to characterize, with large In systems with antenna configurations
According to state-of-the-art feedback design, the feedback overhead for systems with many transmit antennas will lead to undue feedback overhead in many cases
As antenna array sizes get larger, complexity can also become an issue if conventional feedback schemes are used

Method used

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  • A method and apparatus for using factorized precoding

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Embodiment Construction

[0023] figure 1 A first device 10 ("device 1") is shown using a plurality of transmit antennas 16 to transmit a precoded signal 12 to a second device 14 ("device 2"). The second device 14 in turn comprises a plurality of antennas 18 for receiving the precoded signal 12 and for transmitting return data and signaling to the first device 10 , including factorized precoder feedback 20 . The factorized precoder feedback 20 comprises a precoder suggestion for the first device 10 . The first means 10 considers, but does not necessarily act on, the precoding suggestions comprised in the factorized precoder feedback 20 when determining the precoding operation it uses to generate the precoded signal 12 . However, one advantageous aspect of the teachings presented herein is that the factorized precoder Feedback 20 provides greatly improved efficiency.

[0024] In at least one embodiment, the second device 14 suggests the precoder matrix to the first device 10 by indicating the suggest...

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Abstract

According to one or more aspects, the teachings herein improve user equipment (UE) Channel State Information (CSI) feedback, by letting the precoder part of a CSI feedback report comprise factorized precoder feedback. In one or more such embodiments, the factorized precoder feedback corresponds to at least two precoder matrices, including a recommended "conversion" precoder matrix and a recommended "tuning" precoder matrix. The recommended conversion precoder matrix restricts the number of channel dimensions considered by the recommended tuning precoder matrix and, in turn, the recommended tuning precoder matrix matches the recommended precoder matrix to an effective channel that is defined in part by said recommended conversion precoder matrix.

Description

[0001] related application [0002] This application claims priority to US Provisional Patent Application No. 61 / 264495 filed November 25, 2009 and assigned application number 61 / 264495. technical field [0003] The present invention relates generally to transmit signal precoding, and in particular to the use of factorized precoding. Background technique [0004] Multi-antenna technology can significantly increase the data rate and reliability of wireless communication systems. Performance is especially improved if both the transmitter and receiver are equipped with multiple antennas, which create a multiple-input multiple-output (MIMO) communication channel. Such systems and / or related technologies are collectively referred to as MIMO. [0005] The LTE standard is currently evolving with enhanced MIMO support. The core components in LTE are MIMO antenna deployment and the support of MIMO-related technologies. The current working assumption in LTE-Advanced is to support ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06
CPCH04B7/0656H04B7/0456H04L25/49H04B7/0663H04B7/0617H04L2025/03426H04L25/03343H04L2025/03808H04B7/0639
Inventor G·约恩格伦D·哈马瓦尔
Owner TELEFON AB LM ERICSSON (PUBL)