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MIMO system transmitting terminal pre-encoding method based on mercury water injection

A precoding and transmitter technology, applied in transmission systems, space transmit diversity, radio transmission systems, etc., can solve problems such as difficulty in meeting practical application requirements, large computational time overhead, and small channel mutual information, reducing computational time overhead, Improve bit error performance and improve the effect of channel mutual information

Active Publication Date: 2016-02-03
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, these precoding methods have shortcomings, such as channel diagonalization, classical water injection, mercury water injection and maximum diversity precoding, although the calculation time is small, the channel mutual information achieved is also small, which is difficult to meet the actual application requirements; Although the exhaustive precoding and optimal precoding of modulation diversity achieve large mutual information, the calculation time overhead is also large, which is difficult to achieve in practical applications

Method used

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  • MIMO system transmitting terminal pre-encoding method based on mercury water injection
  • MIMO system transmitting terminal pre-encoding method based on mercury water injection
  • MIMO system transmitting terminal pre-encoding method based on mercury water injection

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Embodiment

[0036] Such as figure 1 As shown, a method of precoding at the transmitting end of a MIMO system based on mercury water injection, the core is two main steps to obtain the matrix Σ MWF and V M , the ultimate goal is to get the precoding matrix G.

[0037] figure 2 is an N t root transmit antenna and N r The MIMO system channel model of the root receiving antenna, as can be seen from the figure, there are a total of h 11 , h 12 ,…, Total N r ×N t different coupling channels.

[0038] Consider the baseband equivalent model of the MIMO system as: y=HGx+n.

[0039] where x is N t x1 emission complex vector, y is N r ×1 receive complex vector, H is N r ×N t The complex channel matrix, G is N t ×N t The precoding matrix of . Similarly, the SVD decomposition of the precoding matrix G can be obtained: G = U G Σ G V G h ...

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Abstract

The invention discloses an MIMO system transmitting terminal pre-encoding method based on mercury water injection. The method comprises the following steps: S1, using an SVD technology to decompose a channel matrix to obtain N parallel sub-channels; S2, carrying out power allocation for the signal-to-noise ratio gamma i of the ith sub-channel according to a mercury water injection method to obtain a power allocation matrix sigma MWF; S3, constituting a modulation diversity unitary matrix VM according to a modulation diversity planisphere rotation method to reduce overlapped constellation points; and S4, using a product of an original pre-encoding matrix VH in S1, the matrix sigma MWF in S2 and the matrix VM in S3 as a transmitting terminal pre-encoding matrix, namely, G = VH sigma MWF VM, to obtain the pre-encoding method disclosed by the invention, and using the matrix to transmit signals. By adopting the MIMO system transmitting terminal pre-encoding method disclosed by the invention, a pre-encoding computation time cost is reduced, mutual information of the channel is improved, and the requirements of practical application are satisfied.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for precoding at a transmitting end of a MIMO system based on mercury water injection. Background technique [0002] Multi-antenna technology refers to a comprehensive technology that uses multiple antennas at the transmitting end or receiving end of wireless communication and combines advanced signal processing technology at the same time. If multiple antennas are used at the transmitting end and the receiving end at the same time, it is called multiple input multiple output technology (MIMO, Multiple Input Multiple Output). MIMO is a major breakthrough in smart antenna technology in the field of wireless communication. It can use space-time block code and space multiplexing code technology to double the capacity and spectrum utilization of the communication system without increasing the bandwidth. [0003] The precoding technology at the transmitting en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04
CPCH04B7/0456
Inventor 柯峰黄晓宇唐大津邓远意麦帆
Owner SOUTH CHINA UNIV OF TECH
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