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Method, terminal, base station and communication system for transmitting channel characteristic information

A technology for channel characteristics and information transmission, applied in baseband system components, transmission systems, multi-frequency code systems, etc., can solve the problems of occupying a large feedback signaling overhead, inaccurate codebook precoding, and increasing the burden on terminals. The effect of saving signaling overhead, improving system performance, and reducing processing burden

Inactive Publication Date: 2009-12-09
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The disadvantage of this solution is that: the terminal needs to make judgments based on the estimated downlink channel characteristic information, and decide the codebook to use, which requires a large amount of calculation and increases the burden on the terminal; while the base station needs to pre-store the codebook, due to the number of pre-stored codebooks Limited, the quantization of the codebook leads to inaccurate precoding
[0006] The disadvantage of this scheme is that the estimated downlink channel feature information needs to be encoded and fed back to the base station using odd subcarriers, so it still takes up a lot of feedback signaling overhead

Method used

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  • Method, terminal, base station and communication system for transmitting channel characteristic information
  • Method, terminal, base station and communication system for transmitting channel characteristic information
  • Method, terminal, base station and communication system for transmitting channel characteristic information

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Embodiment 1

[0035] This embodiment is described by taking a Multiple Input Multiple Output (Multiple Input Multiple Output, hereinafter referred to as MIMO) system as an example. Such as figure 1 As shown, this embodiment provides a method for sending channel characteristic information, including the following steps:

[0036] In step 101, the terminal performs channel estimation on a downlink channel to obtain first downlink channel characteristic information.

[0037] Specifically, the downlink channel characteristic information can be estimated according to the downlink pilot signal from the base station. For example, the downlink pilot signal received by the terminal can be expressed as: h d s+n, where: h d Indicates the actual downlink channel characteristic information, s indicates the pilot symbol sent by the base station to the terminal for channel estimation, and n indicates the noise information. The characteristic estimated value of a certain downlink subcarrier that the ter...

Embodiment 2

[0050] This embodiment is described by taking a space division multiple access (Space Division Multiple Access, SDMA for short) system as an example. Such as figure 2 As shown, this embodiment provides a method for sending channel characteristic information, including the following steps:

[0051] In step 201, the terminal performs channel estimation on a downlink channel to obtain first downlink channel characteristic information.

[0052] Specifically, the estimation of the downlink channel can be realized according to the downlink pilot signal from the base station, and the obtained characteristic estimation value of a certain downlink subcarrier is expressed as

[0053] Step 202, differentially modulate the first downlink channel characteristic information into at least one uplink pilot symbol to obtain an uplink pilot modulation symbol, and send it to the base station.

[0054] Since in the SDMA system, the multi-antenna transmission mode is not used for the reverse ...

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Abstract

The embodiment of the invention provides a method, a terminal, a base station and a communication system for transmitting channel characteristic information, wherein the method comprises the following steps: obtaining first downlink channel characteristic information by the terminal; differentiating and modulating the first downlink channel characteristic information into at least one uplink pilot frequency signal to obtain an uplink pilot frequency modulation signal; and transmitting the uplink pilot frequency modulation signal to the base station. The invention feeds back the estimation value of a downlink channel through modulating the downlink channel characteristic information on pilot frequencies of a plurality of uplink channels so as to lead the base station to obtain the characteristics of the uplink channels and the downlink channels, thereby greatly saving the signaling cost; and the invention increases the detection of the uplink pilot frequency signal through adopting a differential modulation mode, and is beneficial to extracting the downlink channel characteristic information.

Description

technical field [0001] Embodiments of the present invention relate to a wireless communication technology, and in particular to a method for transmitting channel characteristic information in a wireless communication system, a terminal, a base station, and a communication system. Background technique [0002] In a wireless communication system, in order to improve communication quality, it is usually necessary to perform channel estimation on the transmission physical channel. For example, when the downlink is used to implement pre-equalization in the SISO system or precoding in the MIMO system, the channel characteristics of the downlink channel need to be known, so the downlink channel needs to be estimated. [0003] In an existing channel estimation scheme, the terminal estimates the downlink channel characteristic information according to the forward common pilot signal from the base station, and calculates the optimal precoding matrix. The index number of the precoding ...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04L1/06H04L25/03H04L27/26
Inventor 阮卫杜颖钢
Owner HUAWEI TECH CO LTD
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