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Method for feedback of channel condition information and net element equipment

A technology of channel state information and equipment, applied in the field of communication, to achieve the effect of obvious performance gain

Active Publication Date: 2013-04-17
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the BER of the MIMO-OFDM precoding system provided by the prior art is not reduced relative to the MIMO-OFDM open-loop system, so that the performance gain of the MIMO-OFDM precoding system is close to zero compared with the MIMO-OFDM open-loop system

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  • Method for feedback of channel condition information and net element equipment
  • Method for feedback of channel condition information and net element equipment
  • Method for feedback of channel condition information and net element equipment

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Embodiment Construction

[0051] An embodiment of the present invention provides a channel state information feedback method, the method comprising: obtaining the maximum value among the signal metric values ​​of each data stream mapped on the same frequency domain unit; obtaining the channel state corresponding to the maximum value The information precoding weight matrix; the index number corresponding to the precoding weight matrix is ​​fed back to the transmitting end. Wherein, the frequency domain unit may be a subcarrier or a frequency band; the signal metric value is a mean square error or a signal-to-noise ratio.

[0052] In the following precoding system with MIMO-OFDM space division multiplexing N T =N s For example, see figure 1 , and combined with image 3 , detailing the channel state information feedback method provided by Embodiment 1 of the present invention, the method includes:

[0053] Step 301 , the precoding selection module 110 at the receiving end obtains the signal metric val...

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Abstract

The invention discloses a feedback method of channel state information. The method comprises the steps of acquiring maxima and minima values of a signal measure X of various data streams in a frequency domain unit; acquiring pre-coding weighted matrix representing the channel state information corresponding to the maxima and minima values; and feeding back the index number corresponding to the pre-coding weighted matrix to a transmitting terminal. By using the technical proposal in the invention, the closed loop MIMO-OFDM system adopting pre-coding had obvious performance gain compared with the open loop MIMO-OFDM system.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a channel state information feedback method and network element equipment. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technology that divides a given channel into many sub-channels in the frequency domain, and uses a sub-carrier for modulation on each sub-channel, and each sub-carrier is parallel At the same time, the serial data stream to be transmitted is decomposed into multiple parallel data streams, and these data streams are mapped to corresponding subcarriers. In this way, each sub-data stream has a lower transmission rate and a longer signal waveform period, so that the transmitted data is less susceptible to multiple channels and other external interference. Multiple Input Multiple Output (MIMO) can greatly increase the capacity of a wireless communication system. Therefore, the MIMO-OFDM system ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L27/26H04L25/03
Inventor 楼群芳
Owner HUAWEI TECH CO LTD