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Channel estimation method and device for downlink data transmission

A technology of channel estimation and downlink data, applied in the field of channel estimation of downlink data transmission, can solve the problem of channel value affecting the channel estimation accuracy, etc., and achieve the effect of reducing the impact and improving the estimation accuracy

Inactive Publication Date: 2017-04-26
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a channel estimation method and device for downlink data transmission to solve the technical problem in the prior art that the Doppler effect causes differences in channel values ​​at different times and affects the accuracy of channel estimation

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  • Channel estimation method and device for downlink data transmission
  • Channel estimation method and device for downlink data transmission

Examples

Experimental program
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Embodiment 1

[0032]This embodiment provides a channel estimation method for downlink data transmission, which is applied to user equipment (UE, UserEquipment) for subsequent demodulation and detection. Such as Figure 4 As shown, the method includes:

[0033] Step S401: Receive downlink data, the downlink data carries PDSCH, pilot signal for estimating physical channel value and pilot signal for estimating physical channel value.

[0034] Step S402: According to the pilot signal used for estimating the physical channel value, estimate the equivalent channel value of the resource block on the resource block carrying the PDSCH.

[0035] In this step, the pilot signal used to estimate the physical channel value is DMRS, and the value range of the equivalent channel value of the resource block is determined according to the number of downlink data transmission layers. For example, when the number of transmitting antennas is 4, the number of receiving antennas is 2, and the number of downlink...

Embodiment 2

[0047] This embodiment provides a channel estimation method for downlink data transmission. This method is applied to the UE. The specific scenario is that the number of transmitting antennas and receiving antennas are both 4, the downlink subframe carries CRS, PDSCH and DMRS, and the number of layers for downlink data transmission is 2. These two layers correspond to port 7 (port7 ) and port 8 (port8). Such as Figure 5 As shown, the method includes:

[0048] Step S501: Receive a downlink subframe, which carries PDSCH, DMRS and CRS.

[0049] Step S502: Estimating the equivalent channel F with RB as granularity according to DMRS RB . In this step, the relationship used is as follows

[0050]

[0051] The left side of the equation is the equivalent channel matrix F, whose behavior is the receiving antenna, and the columns are the transmitting ports, and the right side of the equation is the receiving matrix Y and the inverse matrix of the DMRS code division matrix. The...

Embodiment 3

[0063] This embodiment provides a channel estimation method for downlink data transmission. This method is applied to the UE. The specific scenario is that the number of transmitting antennas and receiving antennas are both 2, and the downlink subframe carries CRS, CSI-RS, DMRS and PDSCH, and the current cell and adjacent cells will not place services at the CSI-RS position. Data, the layer number of downlink data transmission is 1, corresponding to port 7 (port7). Such as Figure 6 As shown, the method includes:

[0064] Step S601: Receive a downlink subframe, which carries PDSCH, DMRS, CSI-RS and CRS.

[0065] Step S602: Estimate the equivalent channel F according to DMRS at the granularity of RB RB .

[0066] This step is similar to step S502 in embodiment two, solve F according to formula (2-1) RB . The difference is that the equivalent channel matrix F, the receiving matrix Y and the inverse matrix of the DMRS code division matrix are all 2×2 matrices. Similarly, o...

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Abstract

Disclosed are a downlink data transmission channel estimation method and device, the method comprising: receiving downlink data, the downlink data bearing a physical downlink shared channel (PDSCH), a reference signal for estimating a physical channel value, and a reference signal for estimating an equivalent channel value; and according to the reference signal for estimating the equivalent channel value, estimating the equivalent channel value of a resource block on the resource block bearing the PCSCH; and according to the reference signal for estimating the physical channel value, estimating the physical channel value of each carrier and the physical channel value of the resource block on the resource block bearing the PDSCH; determining a resource block pre-coding matrix according to the equivalent channel value and physical channel value of the resource block; and determining the equivalent channel value of each carrier according to the physical channel value of each carrier and the resource block pre-coding matrix. The present invention reduces impact of Doppler effect on channel estimation, thus improving the precision of downlink data transmission estimation.

Description

technical field [0001] The present invention relates to the communication field, in particular to a channel estimation method and device for downlink data transmission. Background technique [0002] Long Term Evolution protocol R8 version (LTE R8, Long Term Evolution) introduces a Cell-specific Reference Signal (CRS, Cell-specific Reference Signal) for downlink data demodulation and channel measurement, which requires notification of the precoding matrix. At the same time, LTE R8 introduces a single-layer data demodulation pilot signal (DMRS, DeModulationReference Signal) to perform single-port beamforming. In LTE R9, two layers of data demodulation pilot signals are additionally introduced to perform dual-port beamforming. In LTE R10, a Channel-State Information Reference Signal (CSI-RS, Channel-State Information Reference Signal) is introduced to perform downlink data demodulation and channel measurement. [0003] For multi-layer data demodulation pilot signals, layers a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04B7/08H04B7/06
CPCH04L25/03955
Inventor 刘文豪
Owner ZTE CORP