Circulation delay diversity signal channel estimation method, a system and equipment

A technology of cyclic delay diversity and channel estimation, which is applied in the field of cyclic delay diversity channel estimation, can solve the problem of large error in CDD channel estimation, achieve the effect of increasing frequency selection performance and solving inaccurate channel estimation

Inactive Publication Date: 2010-08-11
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Embodiments of the present invention provide a method, system and device for cyclic delay diversity channel

Method used

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  • Circulation delay diversity signal channel estimation method, a system and equipment
  • Circulation delay diversity signal channel estimation method, a system and equipment
  • Circulation delay diversity signal channel estimation method, a system and equipment

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Example 1

[0040] The embodiment of the present invention provides a CDD channel estimation method, see figure 1 , The method includes:

[0041] 101: Obtain the delay value of the selected cyclic delay diversity CDD;

[0042] Among them, the transmitting terminal selects the delay value δ of the cyclic delay diversity CDD, and generally selects the delay value δ of the cyclic delay diversity CDD as N FFT / 2 or N FFT / 4, where N FFT Is the number of Fourier transform points.

[0043] 102: Extract the channel parameters of the pilot position according to the selected delay value of the CDD, and the channel parameters are linear;

[0044] Among them, the receiving terminal extracts the channel parameters of the pilot position according to the delay value δ of the CDD selected by the sending terminal, including:

[0045] Divide all channel parameters into odd-numbered channel parameters and even-numbered channel parameters, because δ is N FFT / 2 or N FFT / 4, so the channel para...

Example Embodiment

[0052] Example 2

[0053] In order to increase the accuracy of CDD channel estimation and further improve system performance, an embodiment of the present invention provides a CDD channel estimation method, which solves the problem of inaccurate channel estimation by changing the CDD channel parameters to linear values. Among them, the present invention implements In the example, δ is N FFT / 2, take 2 transmitting antennas as an example, see figure 2 , The specific implementation process is as follows:

[0054] 201: Receive a CDD frequency domain signal, and obtain channel parameters corresponding to the frequency domain signal;

[0055] Among them, see image 3 , Assuming that the transmitted signal is S(k) (power is 1, E(|S(k)| 2 =1), after OFDM modulation, copy to 2 channels, the first channel is not delayed, and the second channel is cyclically delayed by δ sampling points. After adding CP and sending on the corresponding antenna, the received frequency domain signal is:

[0056...

Example Embodiment

[0072] Example 3

[0073] In order to increase the accuracy of CDD channel estimation and further improve system performance, an embodiment of the present invention provides a CDD channel estimation method. In the embodiment of the present invention, STBC (Space Time Block Coding, spatial block code) technology / SFBC ( A channel estimation scheme combining Space Frequency Block Coding) technology and CDD technology, and δ is N FFT / 2, take 4 transmitting antennas as an example, see Figure 7 , The specific implementation process is as follows:

[0074] 301: Receive a CDD frequency domain signal, and obtain channel parameters corresponding to the frequency domain signal;

[0075] Among them, see Figure 8 , There are 4 transmitting antennas at the transmitting end, adopting the structure diagram of STBC / SFBC+CDD.

[0076] Suppose the transmitted signal is S(k) (power is 1, E(|S(k)| 2 =1), after STBC / SFBC matrix is ​​divided into two channels, and then copied to two channels after OFDM ...

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Abstract

The embodiment of the invention discloses a circulation delay diversity signal channel estimation method, which comprises the following steps: obtaining the delay value of the selected circulation delay diversity CDD; extracting signal channel parameters in the pilot frequency position according to the delay value of the selected CDD, wherein the signal channel parameters are in linear distribution; and obtaining all signal channel parameters according to the extracted signal channel parameters. At the same time, the embodiment of the invention also provides a circulation delay diversity signal channel estimation system and equipment. Through the technical scheme provided by the invention, the signal channel parameters of the CDD signal channels are converted into the linear values, the problem of inaccurate signal channel estimation can be solved, and the frequency selection performance of the signal channel is added.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method, system and equipment for cyclic delay diversity channel estimation. Background technique [0002] In an OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system, in order to obtain multipath diversity gain, a CSD (Cyclic Shift Diversity, cyclic shift diversity) technology is used. Since the phase shift operation on each subcarrier of the CSD technology is equivalent to a cyclic shift in the time domain, it is also called CDD (Cycle Delay Diversity, cyclic delay diversity). [0003] The CDD technology is usually applied in a flat channel environment, and the frequency selectivity of the channel is increased by artificially adding a cyclic shift diversity technology. For channels of multiple frequencies, parameters of other frequency channels in the system need to be estimated according to parameters of certain frequency chann...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 赵印伟李琦郑创明
Owner HUAWEI TECH CO LTD
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