Dynamic updating method of covariance matrix in cooperative multipoint joint transmission

A technology of covariance matrix and variance matrix, applied in the field of dynamic update of covariance matrix in cooperative multi-point joint transmission, can solve the problems of system performance degradation, rapid change of inapplicable channels, etc., and achieve the effect of good system performance

Active Publication Date: 2012-09-19
天元瑞信通信技术股份有限公司
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Problems solved by technology

If the channel changes rapidly, a large feedback interval will cause a rapid decline in system performance, but if the feedback inte

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  • Dynamic updating method of covariance matrix in cooperative multipoint joint transmission
  • Dynamic updating method of covariance matrix in cooperative multipoint joint transmission
  • Dynamic updating method of covariance matrix in cooperative multipoint joint transmission

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Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. The specific implementation process of the dynamically updated adaptive codebook method includes the following steps:

[0019] Taking the coordinated multi-point joint transmission of PDSCH as an example, consider a cellular wireless communication system composed of B base stations and K users, let B={1,2,...,B} represent the set of all base stations in all cooperative sets , K={1,2,...,K} represents the set of all users. Both the base station and the user are equipped with multiple antennas, and the number of antennas equipped by base station b is N tb , the number of antennas equipped by user k is N rk , unless otherwise specified, it is generally assumed that different base stations and different user equipments have the same num...

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Abstract

The invention provides a dynamic updating method of a covariance matrix in cooperative multipoint joint transmission by taking a typical self-adaption codebook method as a basis to reoptimize a design. An equivalent system between the covariance matrix and a codebook is utilized; based on a mean square error minimum principle, and at a receiving end, the corresponding codebook and one parameter are utilized to simulate a difference value between a covariance matrix at the current moment and a covariance matrix at the last moment; and meanwhile, an index and a corresponding parameter of the codebook are fed back to an emission end. At the emission end, the corresponding codebook is searched according to an index number and the covariance matrix at the current moment is reconstructed by utilizing the feedback parameter and the covariance matrix (or an estimated value) at the last moment, so as to realize a dynamic updating process of the covariance matrix.

Description

Technical field: [0001] The invention relates to an optimal design method of a wireless communication system, in particular to a method for dynamically updating the channel covariance matrix of an adaptive codebook in joint multi-point transmission. Background technique: [0002] A typical adaptive codebook technology is based on implicitly fed back PMI information, making full use of the correlation between antennas, such as using the channel covariance matrix as auxiliary information to realize the original fixed codebook such as LTE Release 8 or 802.16m The codebook rotates adaptively to the channel environment and performs long-term feedback to obtain a better compromise between system performance and feedback overhead with less additional feedback overhead. The feedback interval of typical adaptive codebook technology is generally relatively large, such as 20ms or independently selected according to channel changes. Its biggest feature is that it uses a large feedback i...

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Application Information

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IPC IPC(8): H04L1/00H04L1/12
Inventor 张志杰张国梅吕刚明李国兵罗新民
Owner 天元瑞信通信技术股份有限公司
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