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Precoding method and device

A technology of precoding and precoding matrix, applied in the field of communication, can solve problems such as interference precoding method, no solution proposed, lack, etc., and achieve the effects of preventing excessive interference, improving system throughput, and suppressing interference

Active Publication Date: 2018-04-10
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing precoding methods can only adopt orthogonal cooperative precoding between cells, and use the orthogonality of the receiving space to achieve the purpose of interference cancellation, but cannot solve the interference problem between layers in the cell
[0004] Aiming at the lack of a precoding method to solve the interference between layers in the cell in the related art, no effective solution has been proposed so far

Method used

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  • Precoding method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] image 3 is a flow chart of CoMP precoding according to preferred embodiment 1 of the present invention, such as image 3 As shown, the process includes the following steps (step S302-step S308):

[0055] Step S302, the terminal side performs channel estimation, calculates the PMI of the signal channel and the WCI of the interference channel according to the estimated signal channel and interference channel, and feeds them back to the serving base station.

[0056] UE 1 Estimated base station eNB 1 with UE in this cell 1 The channel matrix H between 11 , and base station eNB 2 UE in neighboring cells 1 The channel matrix H between 12 . According to the estimated H 11 channel information to calculate the PMI of the cell 1 , the estimated H 12 channel information, calculate WCI 1 . UE 1 Feedback PMI 1 and WCI 1 to eNB 1 .

[0057] For cooperating cell eNB 2 For example, UE 2 Estimated cooperating cell eNB 2 with UE in this cell 2 The channel matrix H...

Embodiment 2

[0066] Figure 4 It is the flow chart of realizing the CoMP precoding according to the preferred embodiment 2 of the present invention, such as Figure 4 As shown, the process includes the following steps (step S402-step S432):

[0067] Step S402, start the process.

[0068] Step S404 is the same as step S302 in Embodiment 1, and will not be repeated here.

[0069] Step S406 is the same as step S304 in Embodiment 1, and will not be repeated here.

[0070] Step S408, judge whether the rank of the PMI is 1, if yes, go to step S410, otherwise go to step S416.

[0071] Step S410, judge whether the distance from the PMI to the WCI null space is smaller than the threshold 1 (corresponding to the threshold A in the content of the invention), if yes, go to step S412, otherwise go to step S414.

[0072] Step S412, normalize the vector after the projection of the PMI to the WCI null space as a precoding matrix, and proceed to step S432.

[0073] In step S414, the PMI vector is used...

Embodiment 3

[0084] Figure 5 It is the flow chart of realizing the CoMP precoding according to the third preferred embodiment of the present invention, such as Figure 5 As shown, the process includes the following steps (step S502-step S518):

[0085] Step S502, the rank of the PMI is 3, go to step S504.

[0086] Step S504, calculate the distance from each layer of the PMI to the WCI null space, and proceed to step S506.

[0087] Step S506, calculate the number of each layer of PMI whose distance to the WCI null space is greater than the threshold 1, if it is 3, then enter step S508, if it is 2, then enter step S510, if it is 1, then enter step S512, if it is 0, go to step S512.

[0088] In step S508, the PMI is used as the final precoding matrix, and the process proceeds to step S518.

[0089] Step S510, the distance from the three layers of PMI to the WCI null space is smaller than the threshold 1, using the vector after the projection of the corresponding layer of PMI to the WCI n...

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Abstract

The invention discloses a precoding method and device. Wherein, the method includes: obtaining the PMI of the first base station and the WCI of the second base station, wherein, the first serving cell of the first base station and the second serving cell of the second base station are cooperative cells in the CoMP system; The first PMI layer whose distance to the WCI null space of WCI in all PMI layers is less than the preset distance threshold is projected to the WCI null space, and the projection vector obtained by the projection is updated as the vector of the first PMI layer; the vector is updated The second PMI layer whose angle between any two layers in all PMI layers after completion is less than or equal to the preset angle threshold is subjected to rank reduction processing, and all PMI layers obtained after rank reduction are subjected to normalization processing to obtain the predicted encoding matrix. The present invention can effectively prevent excessive interference between layers, effectively suppress the interference of adjacent cells to the own cell, and further achieve the effect of improving system throughput.

Description

technical field [0001] The present invention relates to the field of communications, and in particular, to a precoding method and device. Background technique [0002] In the Long Term Evolution-Advanced (LTE-A) system of the Third Generation Partnership Project (3GPP), coordinated multiple points (CoMP) The technology utilizes the coordinated transmission of transmit antennas of multiple cells to achieve higher capacity and reliable transmission of wireless links at the cell edge. CoMP technology can effectively solve the problem of cell edge interference. The CoMP defined by 3GPP includes two scenarios: one is coordinated multi-point scheduling, that is, through the exchange of scheduling information between adjacent nodes, the interference between the transmission signals of each cell is coordinated; the other is multi-point joint processing, that is Multiple cooperative nodes jointly provide services for target users by sharing data, Channel Situation Information (CSI),...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/06
Inventor 刘娟王衍文刘文豪
Owner ZTE CORP