Open-loop mimo transmission method and device based on demodulation reference signal

A technology for demodulating reference signals and transmission methods, applied in the field of open-loop MIMO transmission methods and devices, capable of solving problems such as the limited number of open-loop MIMO codebooks

Inactive Publication Date: 2018-12-07
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] It can be seen that in the traditional open-loop MIMO transmission mode, the number of open-loop MIMO codebooks is very limited, and the weights used in the cycle are fixed, so it is difficult to adjust based on the statistical characteristics of the direction of the user.

Method used

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  • Open-loop mimo transmission method and device based on demodulation reference signal
  • Open-loop mimo transmission method and device based on demodulation reference signal
  • Open-loop mimo transmission method and device based on demodulation reference signal

Examples

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Embodiment 1

[0114] This example involves the use of precoding weights during open-loop MIMO transmission under 8-antenna polarization configuration.

[0115] definition For convenience of description, it is assumed here that the number of antenna ports is equal to the number of measurement antenna ports.

[0116] When the number of layers is one, the first way is to configure the second weight in the form of At the same time, the form of configuring the first weight is After the second weight processing, the 8 antenna ports are mapped to 2 demodulation reference signal ports; during the mapping process, in the same physical resource block (PRB, Physical Resource Block) or frequency band, the second weight vector remains different Change, that is, m remains unchanged. In different PRBs or frequency bands, the sender can use different m according to the sending strategy or scheduling strategy. When there is precoding indication information feedback, the second weight may also be obtai...

Embodiment 2

[0134] This example shows how to use precoding weights in open-loop MIMO transmission with 2 and 4 antenna configurations.

[0135] In this embodiment, for the configurations of 2 and 4 antennas, the demodulation reference signal (DMRS) port and the common reference signal (CRS) port are in one-to-one correspondence, that is, the port 7+i of the demodulation reference signal corresponds to the common reference signal The port i of the signal (CRS) is also equivalent to the unit matrix to realize the mapping between the common reference signal (CRS) port and the demodulation reference signal port, and the second weight is in the unit matrix. When the common reference signal (CRS) is not configured in the system, the open-loop MIMO transmission is directly based on the demodulation reference signal. At this time, the second weight is equivalent to achieving the same number of demodulation reference signal (DMRS) ports and measurement reference Mapping of signaling (CSI-RS) ports...

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Abstract

The invention discloses a method for open-loop MIMO (multi-input multi-output) transmission on the basis of a demodulation reference signal. The method includes the steps of mapping data to be transmitted in every level to a DMRS (demodulation reference signal) port via a first weight value according to regulations set by both a transmitter and a receiver, mapping DMRS port data to a CSI-RS (channel state information-reference signal) port or a physical antenna via a second weight value, and transmitting. The invention further discloses a device for the open-loop MIMO transmission on the basis of the demodulation reference signal. The limit that a same PRB (physical resource block) must utilize an identical precoding weight value is avoided, and larger diversity gain can be obtained. The characteristics that direction information in a communication system evolves slowly and phase information in different polarizing directions evolves quickly is fully utilized. In addition, on different PRB or frequency bands, different second weight values can be utilized to realize the mapping from the DMRS port to the CSI-RS port, and thereby diversity effect is further improved.

Description

technical field [0001] The present invention relates to multiple-input multiple-output (MIMO, Multi-Input Multi-Output) transmission technology, in particular to an open-loop MIMO transmission method and device based on a demodulation reference signal. Background technique [0002] The high-order multi-antenna technology is one of the key technologies of the Long Term Evolution Advanced (LTE-A, Long Term Evolution Advanced) system, and is used to increase the transmission rate of the system. Long Term Evolution-Advanced is also known as LTE-Advanced. [0003] In order to achieve channel quality measurement and data demodulation after the introduction of high-order multi-antenna technology, two types of pilot symbols are defined in the downlink transmission of the LTE-A system: demodulation reference signal (DMRS, Demodulation Reference Signal) and channel state information reference A symbol (CSI-RS, Channel State Information-Reference Signal), wherein the DMRS is used for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L1/00
Inventor 孙云锋李儒岳郭森宝徐俊张峻峰
Owner ZTE CORP
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