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Method and device for pre-encoding based on hybrid multiplex demodulation reference symbols

一种解调参考符号、预编码的技术，应用在LTE-A领域，能够解决开销大、无法估计干扰、无法实现导频正交等问题，达到减少可能性、避免干扰、减少开销的效果

Active Publication Date: 2011-08-17
G+ COMMUNICATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In LTE, CRS (common reference signal or cell-specific reference signal, common reference signal) is used for pilot measurement, that is, all users use common pilots for channel estimation. This common reference signal requires additional notification from the transmitting side What kind of preprocessing method is used by the receiving end for the transmitted data, and at the same time, the overhead is relatively large. In addition, in the MU-MIMO (multi-user multiple input multiple output) system, since multiple UEs use the same CRS, it is impossible to implement the pilot frequency Orthogonal, so interference cannot be estimated

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Embodiment 1

[0126] In this embodiment, the SU-MIMO system is taken as an example to illustrate the mapping manner from the layer of the codeword stream to the DMRS port. In SU-MIMO, when the total number of layers corresponding to each codeword stream is less than or equal to the number of orthogonal code division multiplexing layers supported by the RE corresponding to the DMRS port of each group of CDM multiplexing (that is, the number of layers supported by the DMRS port group The maximum number of ports) the mapping method is:

[0127] The DMRS ports of each layer corresponding to the same code stream adopt the same multiplexing method (that is, the layers corresponding to the same code stream are mapped to the DMRS ports of the same DMRS group) such as code division multiplexing; the layers corresponding to different code streams The same or different multiplexing methods are used between the DMRS ports (that is, the corresponding layers of different codeword streams are mapped to th...

Embodiment 2

[0145] In this embodiment, an MU-MIMO system is taken as an example, and a process of mapping each layer corresponding to a codeword stream to a DMRS port. In MU-MIMO, the criterion for allocating DMRS ports for each user is: for each user, each layer corresponding to the same user is mapped to a DMRS port using the same multiplexing mode.

[0146] Among them, the same multiplexing method can refer to: each layer corresponding to the same user is preferentially mapped to the DMRS port of the port group using CDM multiplexing, or each layer corresponding to the same user is preferentially mapped to the port group using FDM / TDM multiplexing on the DMRS ports of different DMRS port groups (that is, on the DMRS ports of different DMRS port groups). The configuration that defines MU-MIMO includes the following parameters:

[0147] In MU-MIMO, the maximum number of layers supported by the system, the maximum number of multiplexed users supported, and the maximum number of layers th...

Embodiment 3

[0169] In this embodiment, SU-MIMO and MU-MIMO use a unified layer-to-DMRS port mapping method. Considering that SU-MIMO and MU-MIMO use a fixed layer-to-DMRS port for mapping, the layer and DMRS port can be Set a fixed correspondence between, define the DMRS port {p 0 ,p 1 ,p 2 ,p 3 ,p 4 ,p 5 ,p 6 ,p 7}. Specifically:

[0170] When the number of layers is less than or equal to 2, the corresponding relationship between layers and DMRS ports can be set as:

[0171] layer 0 ↔ port 0

[0172] layer 1 ↔ port 1

[0173] When the number of layers is greater than 2 and less than or equal to 4, the corresponding relationship between layers and DMRS ports can be set as:

[0174] layer 0 ↔ port 0

[0175] layer 1 ↔ port 1

[0176] layer 2 ...

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Abstract

The invention discloses a method and a device for pre-encoding based on hybrid multiplex demodulation reference symbols and relates to an LTE-A (long term evolution-advanced) technology. The method comprises the following steps: determining the multiplex relationship among DMRS (demodulation reference signal) ports; corresponding data transmission layers to the DMRS ports with the determined multiplex relationship respectively; and performing the pre-encoding on a pilot frequency sequence corresponding to all the DMRS ports according to the corresponding relationship between the data transmission layers and the DMRS ports. By adopting the technical scheme, interference among the layers corresponding to different code word streams can be avoided, and the precision of channel estimation is improved. Simultaneously, as the fixed mapping way is adopted in the technical scheme, the possibility of random mapping is reduced, and the cost of control signaling is reduced.

Description

technical field [0001] The present invention relates to LTE-A (Long Term Evolution Advanced, advanced long-term evolution) technology, in particular to a precoding method and device based on hybrid multiplexing demodulation reference symbols. Background technique [0002] The high-order multi-antenna technology is one of the key technologies of the Long-Term Evolution-Advanced (LTE-A or LTE-Advanced) system, and is used to increase the transmission rate of the system. In order to achieve channel quality measurement and data demodulation after the introduction of high-order multi-antenna technology, the LTE-Advanced system defines two types of pilot symbols: demodulation reference symbols (DMRS, Demodulation Reference Signal) and channel quality measurement reference symbols (CSI - RS, Channel State Information-Reference Signal), wherein the demodulation reference symbol is a reference symbol used for physical downlink shared channel (PDSCH, Physical Downlink Shared Channel) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L25/03
CPCH04L25/0226H04L5/0023H04L2025/03426H04L5/0051H04L2025/03414H04L25/0204H04L1/06H04L27/26
Inventor 孙云锋张文峰姜静张峻峰
Owner G+ COMMUNICATIONS LLC
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