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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
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  • Abstract
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Problems solved by technology

However, conventional techniques may provide limited or no feedback related to channel information

Method used

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  • Antenna switching and uplink sounding channel measurement
  • Antenna switching and uplink sounding channel measurement
  • Antenna switching and uplink sounding channel measurement

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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...

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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

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Application Information

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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
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