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Cooperated multipoint (CoMP) downlink joint transmission method capable of eliminating inter-cell interference and inter-flow interference at same time

An inter-cell interference and joint transmission technology, applied in the field of communications, can solve problems such as high computational complexity, inability to eliminate interference at the transmitting end, and inability to eliminate interference between users in connected cells.

Inactive Publication Date: 2014-12-17
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the linear precoding algorithm is simple to implement, it has received great attention. However, the BD algorithm can only effectively eliminate the interference between users in adjacent cells at the transmitting end, and cannot eliminate the interference between data streams of users in the same cell at the transmitting end. The algorithm can eliminate the interference between the data streams of the same user, but it cannot eliminate the interference between users in connected cells. The BD+SVD algorithm can only eliminate the interference between users in adjacent cells at the transmitting end.
The BD and BD+SVD algorithms can only eliminate the interference between data streams by performing MIMO detection at the receiving end, but in this way, the user end needs to perform matrix inversion operations, and the calculation complexity is high

Method used

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  • Cooperated multipoint (CoMP) downlink joint transmission method capable of eliminating inter-cell interference and inter-flow interference at same time
  • Cooperated multipoint (CoMP) downlink joint transmission method capable of eliminating inter-cell interference and inter-flow interference at same time
  • Cooperated multipoint (CoMP) downlink joint transmission method capable of eliminating inter-cell interference and inter-flow interference at same time

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Embodiment 1

[0060] In the cooperative communication system, the joint transmission communication processing flow proposed by the present invention that can simultaneously eliminate inter-cell interference and inter-data stream interference is as follows: figure 1 shown. Specific steps are as follows:

[0061] Step 1: The M cooperative base stations of the wireless communication network respectively obtain the channel information from the cooperative base station to all K users in the cooperative area, and obtain the channel matrix H k，m (k=1, 2, ..., K, m = 1, 2, ... M), then each cooperative base station will obtain the channel matrix H k，m (k=1, 2,..., K, m=1, 2,...M) and the data s to be sent k (k=1, 2, . . . K) are sent to the joint processing unit. here Indicates the downlink channel matrix from the mth base station to the kth user. Indicates the data information corresponding to the kth user, where d m is the number of data streams corresponding to the kth user, N r is the ...

Embodiment 2

[0103] image 3 A schematic diagram of cooperative communication is given when the number of cooperative base stations is 3. Here, it is assumed that the number of users corresponding to each base station is 1, so the total number of users is 3. Figure 4 The performance comparison between the present invention and existing precoding methods is given. Here it is assumed that the number of cooperative base stations M=3, and the number of base station antennas N T =6, the number of terminal antennas N r =2, the total number of users is K=3, and the number of data streams of each user is 2. As can be seen from the simulation results, the joint precoding method provided by the present invention is more spectrally efficient than the simple BD algorithm and the zero-forcing algorithm It should be high, because the pure zero-forcing algorithm cannot eliminate the interference between cells, so its spectral efficiency is very low. In the result, the performance of the method of the...

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Abstract

The invention discloses a cooperated multipoint (CoMP) downlink joint transmission method capable of eliminating inter-cell interference and inter-flow interference at the same time. The method comprises the following steps of: performing joint pre-coding on all pieces of user data of the service of a cooperated base station in a joint processing unit; and distributing coded information to each base station antenna, and sending the coded information. Interference cannot be formed between user information which is subjected to joint pre-coding, and the interference cannot be formed between a plurality of data flows of the same user, so a receiving end is only required to equalize the received data by using an estimation equivalent channel matrix without complicated matrix inversion operation.

Description

technical field [0001] The invention relates to a CoMP downlink joint transmission method capable of simultaneously eliminating inter-cell interference and inter-stream interference, and belongs to the technical field of communication. Background technique [0002] In the LTE-A system of co-frequency networking, the interference between connected cells limits the service quality and throughput of cell edge users. In order to further improve the spectrum utilization rate of the system and improve the service quality and throughput of users at the edge of the cell, it is necessary to use related technologies to effectively reduce the interference between cells. In the next generation wireless communication system, Cooperated Multipoint (COMP) technology is considered to be an effective method to improve the transmission performance of edge users. [0003] CoMp is an important means to improve cell throughput, especially cell edge throughput. Current technologies mainly includ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04B7/06
Inventor 付卫红史凡颉轶萍刘乃安曾兴雯
Owner XIDIAN UNIV