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A mu-mimo system precoding method and power allocation method based on improved SLNR

A technology of precoding and precoding matrix, which is applied in the field of precoding method and power allocation of MU-MIMO system based on improved SLNR, can solve the problems of high signal bit error rate and high signal transmission bit error rate

Active Publication Date: 2021-09-14
GUANGXI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to improve the traditional SLNR method, the defect that the bit error rate of signal transmission under partial channel state information is relatively high, and improve the medium power distribution in the above-mentioned scene at a lower cost The defect that the technical solution makes the signal error rate of the signal received by users with poor signal-to-noise ratio higher

Method used

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  • A mu-mimo system precoding method and power allocation method based on improved SLNR
  • A mu-mimo system precoding method and power allocation method based on improved SLNR
  • A mu-mimo system precoding method and power allocation method based on improved SLNR

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Embodiment 1

[0041] Such as figure 1 Shown is a block diagram of the MU-MIMO system applied in this embodiment.

[0042] In the traditional multi-user transmission strategy, the transmission data information of the base station can be expressed as:

[0043]

[0044] in, Denotes the transmission vector symbol of user k, Denotes the precoding matrix of user k

[0045] and satisfy the constraints E{xx H}=I N ,||w k || 2 =1.

[0046] The signal received by the user can be expressed as:

[0047] Among them, n kRepresents an additive Gaussian white noise sample with a mean of 0 and a variance of σ k 2 ; MU-MIMO channel of user k is a standard IID Rayleigh fading channel. M for user k k ×N channel matrix H k Expressed as:

[0048]

[0049] The traditional SLNR precoding method can be expressed as:

[0050]

[0051] Among them, SLNR k is the signal-to-leakage-to-noise ratio of user k.

[0052] The traditional SLNR precoding method is based on the SLNR of all user...

Embodiment 2

[0083] Existing precoding methods generally adopt a scheme in which the transmitting end allocates equal power to each user to allocate power to users. However, in an actual wireless communication system, the quality of channel state information (Channel State Information, CSI) of each user is generally different. For MIMO systems, the average bit error rate of all users is determined by the worst user bit error rate. Increasing the allocated power to improve the bit error rate has little effect on improving the user with a good signal-to-noise ratio, so that the above-mentioned equal power allocation scheme of increasing the allocated power to reduce the bit error rate is not economical.

[0084] Therefore, the present invention also proposes a power allocation method, which increases the transmission power for the worst user by increasing, so as to improve the overall channel quality. The specific method is as follows: the base station allocates based on the improved SLNR v...

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Abstract

The invention discloses a MU-MIMO system precoding method based on improved SLNR, which is characterized in that the method is based on the minimum mean square error of the channel modification matrix, and obtains the co-channel interference of other users in the revised estimated channel matrix in the SLNR method The channel modification matrix of the quantity; obtain the optimal precoding matrix of the improved SLNR index based on the channel modification matrix; the estimated channel matrix is ​​configured to estimate incomplete channel state information. In addition, the present invention also discloses a power allocation method based on the improved SLNR-based MU-MIMO system precoding method, the base station allocates based on the improved SLNR value of each user; the power allocated to each user k is the same as that of the user k The improved SLNR value is inversely proportional. For signal transmission under partial channel state information, the present invention can effectively improve the defect of high bit error rate in the traditional SLNR method, and can improve the signal received by users with poor signal-to-noise ratio in the equal power allocation technical scheme at a lower cost A defect with a high bit error rate.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to an improved SLNR-based MU-MIMO system precoding method and power allocation method. Background technique [0002] The popularity of multimedia applications such as smart terminals and social networks has led to a substantial increase in the demand for system capacity and reliability of mobile cellular networks. A Multiple User Multiple Input Multiple Output (Multiple User Multiple Input Multiple Output, MU-MIMO) system is widely used because it can effectively increase channel capacity. The MU-MIMO system greatly improves the system performance by increasing the multiplexing and diversity gain without increasing the bandwidth and transmission power. [0003] In the MU-MIMO downlink model, one of the main goals in designing an optimal linear MU-MIMO precoding scheme is to optimize the SNR, however, due to its coupling nature, this problem is challenging. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B7/0426
CPCH04B7/0426H04B7/0456
Inventor 万海斌赵金鑫覃团发陈海强黎相成
Owner GUANGXI UNIV
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