Method and device for generating cross polarization array codebook and providing codeword indexing information
A codeword index and codeword technology, applied in the field of providing codeword index information to the base station, can solve the problem of large feedback overhead
Active Publication Date: 2014-12-17
ALCATEL LUCENT SHANGHAI BELL CO LTD
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However, expanding the codebook size on the basis of using the original codeword index information, that is, the precoding index (PMI) feedback method will bring greater feedback overhead
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[0030] For one with N in the CLA configuration T (N T In a MIMO system with an even number of transmission antennas, the antennas can be divided into two subsets based on polarity, that is, two groups of different polarized antennas, wherein the first group of polarized antennas is located in the same polarization direction, and the second group of polarized antennas The polarized antenna is located in the other direction of polarization. For antennas in the same polarization direction, the array response is shown in DFT vector form. However, due to cross-polarized discrimination (XPD, Cross-polarized discrimination), the CLA channel does not generally show constant modulus characteristics like a uniform linear array (ULA, uniform linear array) channel. This means that there are amplitude and phase differences between the above two antenna groups.
[0031] Considering the backward compatibility, the codebook design in the present invention can be based on the release 10 cod...
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The invention provides a method for providing codeword indexing information for a base station in a user terminal of a multiple-input multiple-output communicating system. The base station is provided with NT cross polarization array antennas. The method comprises the steps of confirming a first codeword V in a stored first codebook according to an estimated broadband / long-term channel matrix and based on a scheduled criterion, wherein the first codebook is composed of a plurality of NT*1 discrete Fourier transform (DFT) codewords; generating M*N rank r codewords to confirm a rank r codebook according to the first codeword V and stored M*N NT*NT diagonal matrixes Ak and based on a rank r, wherein the r is greater than or equal to 1 and smaller than or equal to NT and represents a unit matrix, alpha m represents amplitude adjustment amount and is greater than 0 and smaller than 1, theta n represents phase adjustment amount and belongs to (0, 2pi), m=0, 1,..., M-1, n=0, 1,..., N-1, and k=mN+n; confirming a second codeword in the rank r codebook according to an estimated narrow-band / short-term channel matrix and based on the scheduled criterion; and sending first codeword indexing information, second codeword indexing information and rank indication information to the base station, wherein the rank indication information indicates the rank r.
Description
technical field [0001] The present application relates to wireless communication, and in particular to a method and device for providing codeword index information to a base station in a user terminal of a wireless communication system, and a method and device for determining a codeword in a base station based on the codeword index information of a user terminal. Background technique [0002] A cross-polarized linear array (CLA, Cross-polarized linear array) is an antenna configuration manner. The polarization of the antenna refers to the direction of the electric field strength formed when the antenna radiates. When the electric field strength direction is perpendicular to the ground, the electric wave is called a vertically polarized wave; when the electric field strength direction is parallel to the ground, the electric wave is called a horizontally polarized wave. A cross-polarized antenna is a type of dual-polarized antenna. [0003] In FDD systems, the transmitter of...
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IPC IPC(8): H04B7/06H04B7/10
Inventor 武露杨红卫
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD