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Feedback of channel state information for MIMO and subband scheduling in a wireless communication system

A sub-band and spatial channel technology, applied in the field of communication, can solve the problem of consuming large wireless resources

Active Publication Date: 2009-04-15
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the terminal consumes a lot of radio resources to send the channel state information to the base station

Method used

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  • Feedback of channel state information for MIMO and subband scheduling in a wireless communication system
  • Feedback of channel state information for MIMO and subband scheduling in a wireless communication system
  • Feedback of channel state information for MIMO and subband scheduling in a wireless communication system

Examples

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Embodiment Construction

[0023] The techniques for transmitting channel state information described herein may be used in a variety of communication systems that support MIMO transmission and utilize any form of frequency division multiplexing (FDM). For example, the technique may be used in systems utilizing Orthogonal FDM (OFDM), Single-Carrier FDM (SC-FDM), and so on. OFDM and SC-FDM divide the system bandwidth into multiple (K) orthogonal subcarriers, which are also called tones, bins, and so on. Each subcarrier can be modulated with data. In general, modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM.

[0024] This technique can also be used to send channel state information on the downlink or uplink. The downlink (or forward link) refers to the communication link from the base stations to the terminals, and the uplink (or reverse link) refers to the communication link from the terminals to the base stations. For clarity, techniques for sending cha...

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Abstract

Techniques for efficiently sending channel state information using differential encoding are described. Differential encoding may be performed across space, across frequency, across space and frequency, across space, frequency and time, or across some other combination of dimensions. In one design, spatial state information may be determined for multiple spatial channels on multiple subbands. The spatial channels may correspond to different antennas, different precoding vectors, etc. Channel quality indicator (CQI) values may be obtained for the multiple spatial channels on the multiple subbands. The CQI values may be differentially encoded across the multiple spatial channels and the multiple subbands to obtain differential CQI information. In another design, CQI values may be obtained for multiple spatial channels on the multiple subbands in multiple time intervals and may be differentially encoded across space, frequency and time. The differential CQI information and the spatial state information may be sent as feedback.

Description

[0001] This application claims priority to U.S. Provisional Patent Application Serial No. 60 / 786,445, entitled "Channel State Feedback for Downlink MIMO-OFDMA Subband Scheduling," filed March 27, 2006, which is assigned to the present assignee , which is incorporated herein by reference. technical field [0002] The present disclosure relates generally to communications, and more specifically, to techniques for transmitting channel state information. Background technique [0003] In a wireless communication system, a base station may utilize multiple (T) transmit antennas to transmit data to a terminal equipped with multiple (R) receive antennas. Multiple transmit and receive antennas make up a multiple-input multiple-output (MIMO) channel that can be used to increase throughput and / or improve reliability. For example, a base station can simultaneously transmit up to T data streams from T transmit antennas to increase throughput. Alternatively, the base station may transmi...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/26H04B7/06
CPCH04B7/066H04L27/2608H04B7/0641H04L1/0026H04B7/0632H04L1/0029H04L1/06H04L5/0044H04B7/0626
Inventor B·金D·P·马拉蒂J·达姆尼亚诺维奇
Owner QUALCOMM INC
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