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

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 bit sequence 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 standardization work of the fourth-generation mobile communication system. [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 ...

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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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