Antenna switching and uplink sounding channel measurement

A technology for downlink and sounding reference signals, which is applied in the field of downlink precoding and beamforming, and can solve the problems of limited and non-provided

Inactive Publication Date: 2010-08-11
QUALCOMM INC
View PDF2 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional techniques may provide limi

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Antenna switching and uplink sounding channel measurement
  • Antenna switching and uplink sounding channel measurement
  • Antenna switching and uplink sounding channel measurement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] Various embodiments will now be described with reference to the drawings, in which the same reference numerals are used to denote the same elements. In the following description, for illustrative purposes, numerous specific details are given to provide a comprehensive understanding of one or more embodiments. However, it is obvious that these embodiments can be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

[0034] As used in this application, the terms "component", "module", "system", etc. are intended to denote computer-related entities, which can be hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process, a processor, an object, an executable code, an execution thread, a program, and / or a computer running on a processor. Fo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

Systems and methodologies are described that facilitate employing downlink precoding based on uplink sounding channel measurement and channel reciprocity in time division duplex or time division multiplex systems. In particular, mechanism are provided that enable downlink precoding in situations where user equipment antenna configuration includes an unequal number of transmit chains and receive chains. A mobile device transmits modulated sounding reference signals on each antenna during a calibration stage. The mobile device then transmits non-modulated sounding reference signals during a normal mode. A base station utilizes the modulated and non-modulated sounding reference signals to restore a downlink channel estimate employed in downlink precoding.

Description

[0001] Cross references to related applications [0002] This application claims the rights and interests of US provisional patent application No. 60 / 956,076 filed on August 15, 2007, entitled "ANTENNASWITCHING AND UPLINK SOUNDING CHANNEL MEASUREMENTBASED DOWNLINK PRECODING IN TDD SYSTEMS". The entire content of the aforementioned application is incorporated herein by reference. Technical field [0003] The following description generally relates to wireless communication, and more specifically to downlink precoding and beamforming in a time division duplex system based on antenna switching uplink sounding measurements. Background technique [0004] Wireless communication systems are widely used to provide various types of communication content, such as voice, data, and so on. A typical wireless communication system may be a multiple-access system capable of supporting communication with multiple users by sharing available system resources (for example, bandwidth, transmission powe...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04B7/06H04L1/06H04L25/02
CPCH04L1/0026H04L25/0208H04L25/0224H04B7/061H04L1/0693H04L25/0204
Inventor B-H·金D·P·马拉蒂J·蒙托霍S·萨卡尔
Owner QUALCOMM INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap