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Method and device for determining pilot symbols

A technology of pilot symbol and determination method, applied in the field of pilot symbol determination method and device

Inactive Publication Date: 2018-01-02
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no relevant technical solution for TM3 open-loop transmission mode based on DMRS for reference

Method used

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  • Method and device for determining pilot symbols
  • Method and device for determining pilot symbols
  • Method and device for determining pilot symbols

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0159] figure 1 It is a schematic diagram of DMRS mapping when there are 12 DMRS groups in the embodiment of the present invention, such as figure 1 As shown, in this example, the open-loop DMRS pilot can be mapped to the {4, 5}th OFDM symbol. Assume that the RE positions occupied by DMRS groups 0 to 11 are respectively (xn, yn) (n is a natural number, n=0 to 11), where x represents the index of the subcarrier sequence number in one RB, and y represents the index of the OFDM symbol. When time division multiplexing is used to map two DMRS ports, the DMRS mapping method is: {x(m), y(m)}={m, (4,5)}, where m=0-11. That is to say, the DMRSs of the 12 DMRS groups are respectively mapped on the 11th to 0th subcarriers of the 4th and 5th OFDM symbols. In the present invention, {x(m), y(m)} represents an array, x(m) represents a subcarrier occupied by a DMRS, and y(m) represents an OFDM symbol occupied by a DMRS. Taking {m, (4, 5)} as an example, it means that the DMRS is carried on...

Embodiment 2

[0162] figure 2 It is a schematic diagram of DMRS mapping when there are four DMRS groups in the embodiment of the present invention, such as figure 2 As shown, in this example, the open-loop DMRS pilot is mapped to the {4, 5}th OFDM symbol. Assume that the RE positions occupied by DMRS groups 0 to 3 are (xn, yn) (n=0 to 3), where x represents the index of the OFDM symbol relative to the subcarrier number in one RB, and y represents the index of the OFDM symbol. The resource units mapped from DMRS group 0 to DMRS group 3 are: {x0, y0}={(0, 4), (4, 5)}, {x1, y1}={(1, 5), (4, 5)}, {x2, y2}={(6,10), (4,5)}, {x3,y3}={(7,11)(4,5)}. That is, the open-loop DMRS pilots in the four DMRS groups are mapped to subcarriers 0, 1, 4, 5, 6, 7, 10, and 11 of the 4th and 5th OFDM symbols.

[0163] Optionally, for each DMRS group, TDM or CDM may be used to multiplex different DMRS ports, and different DMRS groups may use the same and / or different precoding weights and / or different DMRS grou...

Embodiment 3

[0165] image 3 It is a schematic diagram of DMRS mapping when there are two DMRS groups in the embodiment of the present invention, such as image 3 As shown, in this example, the open-loop DMRS pilot can be mapped to the {4, 5}th OFDM symbol. Let the RE positions occupied by DMRS group 0-DMRS group 1 be (xn, yn) (n=0-1), where x represents the index of the OFDM symbol relative to the subcarrier number in one RB, and y represents the index of the OFDM symbol. When time division multiplexing is used to map two DMRS ports, the REs occupied by DMRS group 0 to DMRS group 1 are specifically: {x0, y0}={(0,5), (4,5)}, {x1, y1 }={(6, 11), (4, 5)}. That is, the open-loop DMRS pilots in the two DMRS groups are mapped to the 0th, 5th, 6th, and 11th subcarriers of the 4th and 5th OFDM symbols.

[0166] Optionally, for each DMRS group, TDM or CDM can be used to multiplex different DMRS ports, and different DMRS groups can use the same and / or different precoding weights and / or different ...

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Abstract

The invention discloses a method for determining pilot symbols, comprising: allocating different demodulation reference signals DMRS for data resources of different groups, and using different precoding weights or beamforming weights for precoding data resources of different DMRS groups Or beamforming processing, different DMRS groups are carried on one or more of the 2nd, 4th, 5th, and 8th OFDM symbols of the extended cyclic prefix subframe. The present invention also discloses a device for determining pilot symbols, including: an allocation unit for allocating different DMRSs for data resources of different groups; a processing unit for using different precoding rights for data resources of different DMRS groups value or beamforming weights for precoding or beamforming processing. The present invention bears DMRS of different DMRS groups on corresponding OFDM symbols and sub-carriers, avoids interference between channels of different DMRS groups, and realizes efficient and quick demodulation of data of different DMRS groups.

Description

technical field [0001] The present invention relates to pilot bearing technology, in particular to a pilot symbol determination method and device. Background technique [0002] In Long Term Evolution (LTE, Long Term Evolution) Release8 / 9, in order to measure channel quality and demodulate received data symbols, a common reference signal (CRS, Common Reference Signal) is designed. A user equipment (UE, User Equipment) may perform channel measurement through the CRS, so as to determine that the UE performs cell reselection and handover to a target cell. In addition, the measurement of channel quality is performed in the connected state of the UE. When the interference level is high, the physical layer can disconnect the connection through the radio link connection failure signaling related to the high layer. In LTE Release 10, in order to further improve the average spectrum utilization rate of the cell, the cell edge spectrum utilization rate and the throughput rate of each ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L5/00
Inventor 郭森宝陈艺戬孙云锋
Owner ZTE CORP
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