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Codebook sub-sampling method applied to LTE-A system and device thereof

An LTE-A, sub-sampling technology, applied in the transmission system, baseband system, digital transmission system, etc., can solve the problems that the 8Tx codebook cannot be used, and no 8Tx codebook solution has been proposed.

Active Publication Date: 2012-05-09
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology

Therefore, the currently specified 8Tx codebook cannot be directly used in this CSI reporting mode 1-1, sub-sampling of the currently specified 8Tx codebook is necessary and important
[0003] In the document R1-105011, 揥ay Forward on 8Tx Codebook for Rel.10DLMIMO□, RAN1#62, Madrid, Spain, August 2010, only the 8Tx codebook is specified but no sub-sampling solution for the 8Tx codebook is proposed Program

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  • Codebook sub-sampling method applied to LTE-A system and device thereof
  • Codebook sub-sampling method applied to LTE-A system and device thereof
  • Codebook sub-sampling method applied to LTE-A system and device thereof

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Embodiment Construction

[0012] The method and device for subsampling a codebook for an LTE-A system according to the present invention will be described below with reference to the accompanying drawings and specific embodiments.

[0013] Before introducing the embodiments of the present invention, the 8Tx codebook C proposed in R1-105011 of LTE-A Rel-10 is reviewed. where it is specified that the precoding matrix W is two matrices W 1 and W 2 The product of , that is, W=W 1 W 2 , for W, W 1 and W 2 The codebooks are marked as C, C 1 and C 2 . In other words, the 8Tx codebook C consists of two codebooks (that is, the first codebook C 1 and the second codebook C 2 )constitute.

[0014] The first codebook Codebook1 C of the rank 1 codebook and the rank 2 codebook 1 It can be expressed as follows:

[0015] B=[b 0 b 1 …b 31 ], [ B ] 1 + m , 1 ...

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Abstract

The embodiment of the invention discloses a codebook sub-sampling method applied to an LTE-A system and a device thereof. According to the system, a precoding matrix W is obtained by multiplication of a matrix W1 and a matrix W2 as well as the relation between the W and W1 and W2 is expressed by the following formula: W= W1W2; codebooks of the W, the W1 and the W2 are respectively marked as C, C1 and C2; and r means rank indication. The method comprises: sub-sampling is carried out on the codebook C, so that the size of the codebook C after the sub-sampling is equal to or is less than 4 bits. During the sub-sampling process, code words that are distributed uniformly are extracted from the codebook C; and a portion of or all code words are in a DFT vector mode so as to be suitable for a uniform linear array; and the rest of the code words are suitable for a cross polarization linear array.

Description

technical field [0001] The present invention relates to LTE-Further Long Term Evolution (LTE-A), and more particularly, to a method and apparatus for sub-sampling a codebook for an LTE-A system. Background technique [0002] At present, LTE technology is one of the cutting-edge technologies in the field of wireless technology. In the LTE system, precoding technology is widely used. According to the 8 transmit antenna codebook (referred to as 8Tx codebook) specified in R1-105011 of LTE-A Rel-10, the precoders for subbands are two matrices W 1 and W 2 product of . where the matrix W 1 For wideband and / or long-term channel characteristics, another matrix W 2 It is aimed at frequency selective characteristics and / or short-term channel characteristics. For rank 1 and rank 2, for W 1 The codebook of and for W 2 The size of the codebook is 4 bits. Thus, in Channel State Information (CSI) reporting mode 1-1 (wideband mode), the Precoding Matrix Indication (PMI) requires 8 b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04L7/04
CPCH04L25/03923H04B7/0456H04L25/03343H04B7/0469H04L25/03917H04B7/0478H04B7/10
Inventor 武露杨红卫刘皓
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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