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Limited feedback unitary codebook design method based on Khatri-Rao matrix product

A design method and matrix technology, applied in the field of limited feedback precoding, can solve problems such as difficult to achieve global optimum and high complexity of codebook set

Inactive Publication Date: 2013-11-20
XI AN JIAOTONG UNIV
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Problems solved by technology

Although a large-sized codebook set can be constructed according to this method, it needs to search optimally for multiple frequency coefficients in the rotation matrix at the same time, so it is difficult to achieve the global optimum, and random search makes the codebook The complexity of collection construction is very high

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  • Limited feedback unitary codebook design method based on Khatri-Rao matrix product
  • Limited feedback unitary codebook design method based on Khatri-Rao matrix product
  • Limited feedback unitary codebook design method based on Khatri-Rao matrix product

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Embodiment Construction

[0047] The KRP codebook construction method among the present invention is as follows:

[0048] 1) System model

[0049] Consider a N T transmitting antennas, N R A MIMO system with limited feedback precoding for four receive antennas. The transmitter uses OSTBC for transmission, assuming that the transmission format of OSTBC is M×T dimension (MT ) codeword matrix C, before transmission, in order to further improve the performance of the MIMO system and make OSTBC suitable for any number of transmit antennas, the OSTBC matrix C is precoded, that is, the codeword matrix C is multiplied by N T ×M-dimensional precoding matrix F.

[0050] In order to improve system performance and reduce system feedback overhead, the present invention adopts a limited feedback strategy, that is, codebook sets of different sizes L are designed in advance , are pre-stored at the transmitting end and receiving end respectively, and the receiving end selects an optimal codebook from the codebook ...

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Abstract

The invention discloses a limited feedback unitary codebook design method based on a Khatri-Rao matrix product. On the basis of constructing a similar Vandermonde matrix by utilizing a PSK symbol vector, a unitary matrix and the Vandermonde matrix carry out Khatri-Rao matrix product to generate a unitary codebook. Compared with the traditional Grassmannian codebook, the KRP (Khatri-Rao Product) codebook is generated without carrying out optimal search, and the unitary codebooks with different sizes can be generated by setting different parameters. In addition, with the special structure, the KRP codebooks can be instantly generated at the receiving end and the transmitting end according to needed feedback bit number and transmitting antenna number without occupying the storage space of the receiving end and the transmitting end. Theoretical analysis and a simulating result indicate that the system can obtain full antenna diversity by adopting the KRP codebook as limited feedback precoding; and when the feedback bit number is same, the performance of the KRP codebook is better than the Grassmannian codebook.

Description

technical field [0001] The invention belongs to a limited feedback precoding technology in a multi-antenna wireless communication system, and particularly relates to a precoding codebook design method. Background technique [0002] In recent years, Orthogonal Space-Time Block Codes (OSTBC) have become the most widely used space-time codes in multi-antenna (MIMO) systems because of their good performance and simple decoding methods. However, OSTBC's potential application is limited because it is only suitable for transmission on a certain number of transmit antennas. On the other hand, since the transmission of space-time coding does not require the transmitter to obtain channel state information (CSI), it is generally believed that space-time coding technology is an "open-loop" diversity technology. However, compared with closed-loop diversity technologies such as beamforming, space-time coding The open-loop diversity of time coding has a certain performance loss because it...

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Application Information

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IPC IPC(8): H04L1/06H04L1/00
Inventor 王磊陈志刚
Owner XI AN JIAOTONG UNIV
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