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A non-orthogonal precoding codebook design method suitable for mu‑mimo systems

A design method and non-orthogonal technology, applied in the field of non-orthogonal precoding codebook design, can solve problems such as high complexity, and achieve the effects of low complexity, optimized energy efficiency utilization, and high matching degree

Active Publication Date: 2017-08-25
CHONGQING UNIV OF POSTS & TELECOMM
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  • Description
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Problems solved by technology

For nonlinear precoding that includes additive processing, the dirty paper coding (Dirty Paper Coding, DPC) proposed by Costa, which can reach the MIMO Gaussian broadcast channel capacity, is the most typical, but the complexity is too high to be applied in practice. THP (Tomlinson-Harashima Precoding) is improved on the basis of DPC, which is a non-linear decorrelation interference cancellation method at the sending end

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  • A non-orthogonal precoding codebook design method suitable for mu‑mimo systems
  • A non-orthogonal precoding codebook design method suitable for mu‑mimo systems
  • A non-orthogonal precoding codebook design method suitable for mu‑mimo systems

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Embodiment Construction

[0023] The non-orthogonal codebook design method in the multi-user MIMO system proposed by the present invention includes the construction of the codebook I, the construction of the codebook II and the corresponding code selection criteria and user scheduling criteria of the base station.

[0024] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] figure 1 A schematic diagram of a multi-user system based on non-orthogonal codebook precoding is given. Assume that the base station is configured with M antennas, each user is configured with N antennas, and the number of scheduled users is K. Each user adopts single-layer transmission, and its corresponding input information bit stream is divided into K parallel sub-streams after channel coding, modulation and layer mapping, satisfying the relationship K≤M. Differences between subcarriers are ignored, ie all subcarriers experience the same fa...

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Abstract

The invention discloses a non-orthogonal precoding codebook designing method suitable for an MU-MIMO system, and belongs to the technical field of communication. Two codebooks are constructed in a non-orthogonal mode and coexist in all user sides and a base station side; each user selects precoding codons according to the current CSI and feeds back the codebook index corresponding to optimal precoding to the base station side; according to the indexes fed back by all the users, a base station recovers the corresponding precoding codons and performs precoding processing on the current dispatched users according to a user dispatching strategy and respective optimal precoding codons. Compared with an orthogonal codebook, the codebooks constructed through the method are low in complexity, coverage on channel space is larger, and the matching degree of a channel matrix is higher. In addition, precoding vectors are selected by adopting the energy efficiency optimum criterion, and therefore utilization of system energy efficiency can be optimized to a degree; a multi-user dispatching scheme is adopted for a sending end, and therefore unsuccessful user matching is avoided.

Description

technical field [0001] The invention belongs to the technical field of communication, especially the technical field of long-term evolution of mobile communication (LTE) and advanced long-term evolution of mobile communication (LTE-Advanced), and relates to a non-orthogonal precoding codebook design method suitable for MU-MIMO systems . Background technique [0002] The Multiple Input Multiple Output (MIMO) system shows great potential in data transmission, and it is a candidate technology for the next generation mobile communication technology, which has aroused great interest of researchers. [0003] In the process of enhancing the LTE physical layer, MIMO technology, as a significant breakthrough in modern digital communication systems, is the key to improving system performance. Since the advent of MIMO, it has been widely used in wireless access systems, wireless local area networks, and 3G networks. , it uses the multipath fading characteristics of the channel, which ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04B7/06
CPCY02D30/70
Inventor 景小荣张阳林张祖凡陈前斌
Owner CHONGQING UNIV OF POSTS & TELECOMM