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Self-adaption precoding matrix indexing feedback method adaptive to joint transmission

A technology of precoding matrix and joint transmission, applied in the field of joint transmission (Joint Transmission) mobile communication and joint transmission mobile communication, can solve the problems of increasing manufacturing cost and energy consumption, increasing processing complexity, not complying with energy saving and emission reduction, etc.

Inactive Publication Date: 2012-11-21
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

It can be seen from the above that if the number of bits of the precoding matrix index of the link from each base station to the terminal is equal, the processing complexity of the terminal will increase linearly with the number of cooperative base stations; Although the terminal can meet its processing needs, the manufacturing cost and energy consumption will be greatly increased, which does not meet the current social requirements for energy conservation and emission reduction

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  • Self-adaption precoding matrix indexing feedback method adaptive to joint transmission
  • Self-adaption precoding matrix indexing feedback method adaptive to joint transmission
  • Self-adaption precoding matrix indexing feedback method adaptive to joint transmission

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Embodiment 1

[0029] This embodiment adopts the third generation partnership project (3 rd The Long Term Evolution system of the Generation Partner Project, using the third generation partnership project scenario 1 (case1) as the simulation environment, adopts the frequency division duplex (FDD) mode, and the system bandwidth is 10 MHz; participate in joint transmission Number of base stations N B = 3, the number of transmit antennas N of each base station T = 4; there are 10 user terminals in the system, and one of them is selected for transmission by the proportional fairness (PF) scheduling method; the number of receiving antennas for each user is N R =2, the number of supported substreams v=1, and a minimum mean square error receiver is used.

[0030] Here, the spatial channel model (Spatial Channel Model) is used to simulate the channel. According to the channel estimation technique, the user can obtain the channel matrix H from each base station to its downlink k (k=1,2,3), where...

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Abstract

The invention discloses a self-adaption precoding matrix indexing feedback method adaptive to joint transmission; the method is characterized in that: a user terminal determines a serving base station and the adjacent cooperation base station according to the size of the channel quality indicator from all base stations to the terminal, regenerates a series of precoding matrix codebooks with different size and ensures that the code words are uniformly distributed on the unit sphere; the maximum codebook is quantized and the maximum number bit sequence is used for expressing the counted-out precoding matrix index for the link of the serving base station; for the link of the adjacent cooperation base station, the suggested formula is adopted for working out the length which expresses the bitsequence of the index, the corresponding codebook subset is used for quantification and the shorter bit sequence is used for expressing the obtained index; and finally, the bit sequence is fed back to the corresponding base station. By adopting the method in the invention, the feedback expense can be greatly reduced on the premise of affecting the frequency spectrum efficiency hardly.

Description

technical field [0001] The invention belongs to the technical field of joint transmission (Joint Transmission) mobile communication, in particular to a precoding matrix index (Precoding Matrix Index) feedback method in the technical field of joint transmission mobile communication. Background technique [0002] Joint transmission technology is considered to be an important way to reduce inter-cell interference and improve spectral efficiency of edge users in the Long Term Evolution-Advanced system, and it is also an important aspect of the fourth-generation mobile communication system standardization work. [0003] The third generation partnership project radio access network technical specification group (3GPP) the ninth version of the further improvement of the physical layer of the universal terrestrial wireless access (TS 36.814 V9.0.0, Release 9, pp.15-19, Mar, 2010 ) stipulates that in traditional communication methods, a user terminal can receive services from at most...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16H04L1/00H04B7/04
Inventor 李士超邱玲
Owner UNIV OF SCI & TECH OF CHINA
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