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Precoding method and cooperative communication method based on channel information covariance

A technology of channel information, covariance, applied in the direction of sustainable communication technology, error prevention/detection through diversity reception, location diversity, etc.

Inactive Publication Date: 2018-04-24
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the channel changes rapidly, frequent measurement and feedback of channel information will inevitably bring a great burden to the system backhaul link

Method used

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  • Precoding method and cooperative communication method based on channel information covariance
  • Precoding method and cooperative communication method based on channel information covariance
  • Precoding method and cooperative communication method based on channel information covariance

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Experimental program
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Embodiment 1

[0047] see figure 1 , is a flowchart of steps of an embodiment of a precoding method based on channel information covariance provided by the present invention.

[0048] The precoding method based on channel information covariance provided in this embodiment mainly includes the following steps:

[0049] Step S101: Measure the global channel information in the multi-cell multi-antenna interference communication system, obtain the channel covariance matrix and system noise power, and send the channel covariance matrix and system noise power to the first base station in the system for processing.

[0050] The multi-cell multi-antenna interference communication system includes multiple base stations, and the base stations participating in implementing the channel information covariance-based precoding method in the embodiment of the present invention are collectively referred to as the first base station.

[0051] see figure 2 , is a schematic structural diagram of the multi-ant...

Embodiment 2

[0090] This embodiment is based on the first embodiment, specifically, under the system model of "2 users, 4 transmitting antennas, and 2 receiving antennas", the precoding method and the cooperative communication method based on channel information covariance provided in this embodiment Describe in detail, and compare the performance of the system and rate obtained by implementing the technical solution provided by this embodiment with the traditional method.

[0091] During specific implementation, under the simulation environment of Matlab (advanced technical computing language and interactive environment for algorithm development, data visualization, data analysis and numerical calculation) simulation environment, use the exponential correlation model to the system user and the proposed method of the present invention speed simulation. In the simulation experiment, the transmitter and receiver correlation matrix sets are respectively and , in the correlation matrix in ...

Embodiment 3

[0113] This embodiment is based on the first embodiment, specifically, under the system model of "3 users, 4 transmitting antennas, and 2 receiving antennas", the precoding method and the cooperative communication method based on channel information covariance provided in this embodiment Describe in detail, and compare the performance of the system and rate obtained by implementing the technical solution provided by this embodiment with the traditional method.

[0114] During specific implementation, this embodiment still uses the same exponential correlation channel model as that of Embodiment 2 to simulate the system and rate of the method proposed in the present invention.

[0115] In the specific implementation process, the correlation coefficient can be set as: 0.82, 0.65, 0.90, =1,2,3; =0.25, =0.21, =0.62, = 1, 2, 3, and all the other implementation steps are the same as in Embodiment 2.

[0116] see Figure 4 , is a performance comparison diagram betwee...

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Abstract

The invention discloses a pre-coding method based on a channel information covariance. The pre-coding method comprises the following steps that global channel information in a multi-cell multi-antenna interference communication system is measured to obtain a channel covariance matrix and system noise power, and the channel covariance matrix and the system noise power are transmitted to a first base station to process uniformly; the first base station carries out setting of a current iteration index and initializes the channel covariance matrixes of all users according to the number of the users of the system; the optimal transmitting power and maximum signal to interference and noise ratios of all users are computed one by one according to the covariance matrix corresponding to each user; and the covariance matrixes corresponding to all users and the current iteration index are updated until the SINR (Signal to Interference and Noise Ratio) converges, the first base station obtains an optimal covariance matrix set of the system and a corresponding optimal pre-coding matrix set, and transmits all pre-coding matrixes to other corresponding base stations. The invention also provides a cooperative communication method, which has the advantages of small amount of information and less system expenditure.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a precoding method and a cooperative communication method based on channel information covariance. Background technique [0002] In the multi-cell multi-antenna interference communication system model, when the base station sends data to the target user, it will interfere with users in other cells. Therefore, it is necessary to study the interference suppression method for multi-cell multi-user communication, which is known in some Under the condition of specific channel state information, the interference between multiple users is weakened or zero-forced in advance through the cooperation between multiple cells, so as to achieve the purpose of improving the overall system and rate. [0003] There have been many studies on multi-cell multi-antenna interference communication systems. Among them, "Interference alignment and degrees of freedom of the K-user i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04B7/06
CPCH04B7/024H04B7/0456Y02D30/70
Inventor 周雯李洲
Owner SHANTOU UNIV
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