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Design method of precoding under the condition of known steering matrix in fdd system

A design method and precoding technology, applied in transmission systems, radio transmission systems, electrical components, etc., can solve problems such as impractical, high consumption, and large time-frequency overhead, so as to achieve high channel utilization and improve system performance , the effect of reducing system training and feedback overhead

Active Publication Date: 2021-12-14
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0003] For frequency division duplex (FDD) massive MIMO systems, it takes a lot of time-frequency overhead to obtain downlink CSI
In an actual massive MIMO system, since the amount of training and feedback overhead is proportional to the number of BS antennas, traditional linear channel estimation methods such as the least squares algorithm (LS) and the linear minimum mean square error (LMMSE) algorithm ) to obtain CSI is too expensive and impractical

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  • Design method of precoding under the condition of known steering matrix in fdd system
  • Design method of precoding under the condition of known steering matrix in fdd system
  • Design method of precoding under the condition of known steering matrix in fdd system

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Embodiment Construction

[0035] The technical solution of the present invention will be further explained below.

[0036] In the FDD system of the embodiment of the present invention

[0037] The precoding design method under the condition of the known steering matrix is ​​improved to address the shortcomings of the existing precoding design methods.

[0038] Specific application cases are as follows:

[0039] Assume that there is 1 user and 1 base station in the system, and the number of antennas of the base station is 32, and the value of K is 10 as an example. Based on the above system environment, combined with the precoding design method in the present invention. The following table shows the general parameters of the system, and the precoding design is performed according to the system parameters in Table 1.

[0040] Table 1 System parameter selection

[0041]

[0042] S1, design the pilot sequence and process the received signal

[0043] It is assumed that the channel is established bas...

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Abstract

The invention belongs to the technical field of wireless communication, and specifically relates to a precoding design method under the condition of a known steering matrix based on channel partial reciprocity in an FDD massive MIMO system. The precoding design method includes the following steps: designing a pilot sequence and processing Receive signal; select codeword and feed back its index; design precoding and transmit information. Compared with the existing method, the precoding design method of the present invention under the condition of known steering matrix has better system performance, and can achieve a high channel utilization rate under the condition of knowing a small amount of channel information, and the proposed The CSI feedback process can greatly reduce system training and feedback overhead, thereby further improving system performance.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a precoding design method under the condition of a known steering matrix based on channel partial reciprocity in an FDD massive MIMO system. Background technique [0002] In a massive MIMO system, using the large-scale antenna array of the base station (BS), the system can obtain extremely high spatial resolution and spatial division multiplexing gain, so that multiple Users provide services, which greatly improves the spectrum efficiency and transmission rate of the system. However, these advantages all depend on the availability of channel state information (CSI), so how to accurately obtain the CSI has an important impact on system performance in practical systems. [0003] For frequency division duplex (FDD) massive MIMO systems, it takes a lot of time-frequency overhead to obtain downlink CSI. In an actual massive MIMO system, since the amount of...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456
CPCH04B7/0456
Inventor 王海泉高丹蓓陈跃叶杭
Owner HANGZHOU DIANZI UNIV
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