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Method for mapping down special pilot frequency and physical resource block of long loop prefix frame structure

A technology of physical resource blocks and dedicated pilots, which is applied in the field of mapping between downlink dedicated pilots and physical resource blocks in the long cyclic prefix CP frame structure, can solve the beamforming weight feedback overhead, common pilots cannot obtain all channel information, etc. problems, to avoid feedback overhead

Active Publication Date: 2009-01-21
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As mentioned above, in the current version of the LTE standard, when the base station uses beamforming with more than 4 antennas, the common pilot cannot obtain all channel information, and there is a problem of feedback overhead of beamforming weights. A kind of New mapping method of downlink dedicated pilot and physical resource block

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  • Method for mapping down special pilot frequency and physical resource block of long loop prefix frame structure
  • Method for mapping down special pilot frequency and physical resource block of long loop prefix frame structure
  • Method for mapping down special pilot frequency and physical resource block of long loop prefix frame structure

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Embodiment

[0056] Example: here, such as image 3 As shown, since A=1 and B=5, in the embodiment of the present invention, the downlink dedicated pilots are respectively mapped to the 5th, 8th, and 12th OFDM symbols in the time domain.

[0057] Based on the foregoing content, the specific operation of performing mapping processing of other downlink dedicated pilots in step S208 is:

[0058] Map the second downlink dedicated pilot to the 5th OFDM symbol in the time domain, and map to the A+3=4th subcarrier in the frequency domain;

[0059] Map the third downlink dedicated pilot to the 5th OFDM symbol in the time domain, and map to the A+6=7th subcarrier in the frequency domain;

[0060] The fourth downlink dedicated pilot is mapped to the 5th OFDM symbol in the time domain and to the A+9=10th subcarrier in the frequency domain;

[0061] Map the fifth downlink dedicated pilot to the 8th OFDM symbol in the time domain and to the A=1 subcarrier in the frequency domain;

[0062] The sixth downlink...

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Abstract

The invention relates to a mapping method of specific downgoing pilot frequency with long-circulating front frame structure and physical resource block. The method comprises: the first specific downgoing pilot frequency at each path is mapped to the specific location of the physical resource block, the frequency domain position thereof is set as the same sub-carrier of the common pilot frequency at the first column of the physical resource block; other specific downgoing pilot frequencyes of the path are mapped according to the time domain interval, the frequency domain interval and the predetermined rule; the time domain interval is two or three orthogonal frequency division multiplex symbols, and the frequency domain interval is two sub-carrier with the same time domain. The method clarifies the position of the pilot frequency symbol in the physical resource block, and solves the problem which is unable to obtain the entire signal channel information by the common pilot frequency in the existing LTE standard version when the base-station terminal is formed by the wave beam of more than four antennas, and enables the signal channel information obtained by the specific pilot frequency to contain the true signal channel information and the processing weight formed by the wave beam, enables the terminal to form the transmission weight without obtaining the specific wave beam, thereby avoiding the feedback spending of the wave beam to form weight.

Description

Technical field [0001] The present invention relates to wireless communication, in particular to a method for mapping downlink dedicated pilots and physical resource blocks in a long cyclic prefix CP frame structure in a long term evolution system (Long term evolution, LTE for short). Background technique [0002] In the current version of the LTE (Long term evolution, long term evolution system) standard, 3GPP (3rd Generation partnership project, third generation mobile communications partnership project) TR 36.211, a beamforming technology that supports a single stream is specified, in order to distinguish between beamforming and pre-processing. The coding also clarifies the condition that beamforming is applied to the number of antennas greater than or equal to four. However, only four common pilots are defined in the current version of the LTE standard. Therefore, only four common pilots are used in practice, and the channel information of each antenna port is extracted from ...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04J11/00
CPCH04B7/068H04L5/0051H04L27/2607H04L27/261
Inventor 姜静郁光辉于辉
Owner ZTE CORP
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