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Adaptive Precoding Based on Reliability of Channel State Information

A technology of channel state information and precoding, which is applied in the field of spatial precoding, and can solve problems such as the occasional problem of unreliable precoder information for a single mobile terminal

Inactive Publication Date: 2017-09-15
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Clearly, enabling CRS is not an energy-efficient solution to the occasional problem of unreliable or non-existent precoder information for a single mobile terminal

Method used

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  • Adaptive Precoding Based on Reliability of Channel State Information
  • Adaptive Precoding Based on Reliability of Channel State Information
  • Adaptive Precoding Based on Reliability of Channel State Information

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Embodiment Construction

[0030] The invention is described more fully hereinafter with reference to the accompanying drawings, in which examples of embodiments of the invention are shown. This invention may, however, be embodied in different forms and should not be construed as limited to the specific embodiments set forth herein. It should also be noted that these embodiments are not mutually exclusive. Thus, it may be assumed that a component or feature from one embodiment is present in or used in another embodiment where such inclusion is appropriate.

[0031] For purposes of illustration and explanation only, the present invention is described herein in the context of operating in a radio access network (RAN) communicating with wireless terminals (also referred to as user equipment or "UE") over wireless communication channels These and other examples of . More specifically, it is described in the context of systems using the Long Term Evolution (LTE) technology, also known as the Evolved UMTS T...

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Abstract

In a system using spatial precoding, where reliable channel state information is not available, the sending node uses an extended transmission mode, where the extended transmission mode is applied to each of multiple time-frequency resource groups The precoder of the data changes according to the frequency. The extended transmission pattern creates a frequency-selective variation of the precoder while using DMRS-based transmission, which may appear random. This variation is achieved by applying a different precoder to the data-carrying resource elements using a precoder variation pattern known to the receiving device. The precoding applied to the DMRS within a given group of time-frequency resources remains constant - thus varying precoders within a given group of time-frequency resources are only applied to data units and not to DMRS resource units.

Description

technical field [0001] The present invention relates generally to wireless communication systems and, more particularly, to techniques for spatially precoding signals transmitted from multiple antennas. Background technique [0002] In many wireless communication systems, wireless receivers use one or more of various types of pilot signals to assist in demodulating received signals. These pilot signals are often referred to as reference signals and / or reference symbols. In the 3rd Generation Partnership Project (3GPP) specification for the Long Term Evolution (LTE) wireless system (also commonly referred to as the Evolved UMTS Terrestrial Radio Access Network or E-UTRAN), the receiving wireless device has two different There are two frequency signal types used for data demodulation, namely, Common Reference Signal (CRS) and Demodulation Reference Signal (DMRS). These are found in 3GPP specifications, for example, in Evolved Universal Terrestrial Radio Access (E-UTRA); Phys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04L27/26H04L25/03H04L25/02
CPCH04L5/0023H04L5/0048H04L25/0222H04L25/03343H04L25/03949H04L27/261H04W72/0446
Inventor 弗雷德里克·努德斯特伦本特·林多夫
Owner TELEFON AB LM ERICSSON (PUBL)