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Space division mode switching method for single-user MIMO (Multiple Input Multiple Output) system based on SWIPT

A mode-switching, single-user technology, applied in the transmission system, space transmit diversity, digital transmission system, etc., can solve the problem of arbitrary switching of the space division mode switching method in the MIMO system

Active Publication Date: 2015-12-02
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing MIMO system space separation mode switching method cannot switch arbitrarily between the two modes of energy mobile phone and information decoding, and propose a single-user MIMO system space separation mode switching method based on SWIPT

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  • Space division mode switching method for single-user MIMO (Multiple Input Multiple Output) system based on SWIPT
  • Space division mode switching method for single-user MIMO (Multiple Input Multiple Output) system based on SWIPT
  • Space division mode switching method for single-user MIMO (Multiple Input Multiple Output) system based on SWIPT

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specific Embodiment approach 1

[0034] The SWIPT-based single-user MIMO system space division mode switching method of the present embodiment combines figure 1 As shown, the method is realized through the following steps:

[0035] Step 1. Assuming that the energy of the signal sent by the sending end is P, the signal energy is divided into two parts according to the coefficient α and assigned to the IR part and the ER part of the receiving end respectively. The received energy of the IR part and the ER part is expressed as:

[0036] P IR =αζP(1)

[0037] P ER =(1-α)ζP(2)

[0038] Among them, the constant α represents the proportion of the received energy of the IR part of the total energy, and α=N ID / N, 0μ , 0ID Indicates the number of antennas used for information reception in the IR part; N indicates the total number of antennas; let N ER Indicates the number of antennas used for energy harvesting in the ER part, then N ER =N-N ID ;

[0039] Step 2. Set the number of transmitting antennas at the t...

specific Embodiment approach 2

[0057] The difference from Embodiment 1 is that the SWIPT-based single-user MIMO system space division mode switching method of this embodiment uses the ZFBF method for precoding as described in step 2, and removes the reception of the information receiving antenna k represented by formula (3). The interference information in the signal, and under the condition of satisfying the zero-forcing constraint, the process of rewriting formula (3) is,

[0058] First, the receiving end simply regards multi-user interference as white noise, and the maximum sum capacity achieved by the BF precoding method is:

[0059] R B F = m a x w k , P k Σ k = 1 ...

specific Embodiment approach 3

[0068] The difference from specific embodiment 1 or 2 is that in the SWIPT-based single-user MIMO system space division mode switching method of this embodiment, the process of power allocation through the power water injection method described in step 2 is that the channel of the power water injection method The better the condition, the less affected by channel noise, the more power will be allocated; on the contrary, the worse the channel condition, the greater the impact of channel noise, the less power will be allocated. If the channel condition is too bad, no power will be allocated.

[0069] First, the water injection line μ represents the desired average power distribution line, and the water injection line μ is:

[0070] μ = ( P + Σ k ∈ Ω ...

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Abstract

The invention relates to a space division mode switching method of a single-user MIMO (Multiple Input Multiple Output) system based on SWIPT, belonging to the field of space division mode switching of MIMO systems. The problem that the existing space division mode switching method of the MIMO system is incapable of randomly switching between an energy mobile phone mode and an information decoding mode can be solved. The space division mode switching method of the single-user MIMO system based on SWIPT comprises the following steps that: information transmission is carried out by selecting a user having best conditions at first; power is distributed according to a power allocation algorithm; the sum-rate of the system is calculated according to a formula as shown in the specification; the sum-rate of the system is compared with the lowest transmission rate requirement Rmin of the system; if requirements of the system are not satisfied, the number of antennas is increased, so that the sum-rate of the system is calculated again till the requirements of the system are satisfied; all other antennas are used for energy harvesting; energy distribution and transmission can be carried out according to an energy beam forming algorithm; and the sum of energy harvested by a receiving end is finally calculated according to a formula as shown in the specification. The space division mode switching method of the single-user MIMO system based on SWIPT disclosed by the invention is applied to switching working modes of the single-user MIMO system based on the SWIPT technology.

Description

technical field [0001] The invention relates to a space division working strategy of a SWIPT system, in particular to a working mode switching strategy considering that a receiving end user has multiple antennas. Background technique [0002] The SWIPT receiving end has two working modes of information receiving end (Information Receiver, IR) and energy receiving end (Energy Receiver, ER), which are respectively used to complete two functions of information decoding (Information Decode, ID) and energy harvesting (Energy Harvest, EH). According to the mode switching strategy of the receiving end, the receiving end switches back and forth between the two working modes of information demodulation and energy harvesting, and realizes the maximum information transmission rate and energy harvesting under the premise of meeting the service quality requirements such as energy requirements and information transmission rate requirements of the receiving end. Efficiency compromise. Com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08H04L5/00H04W72/04
CPCH04B7/0808H04L5/006H04W72/0473
Inventor 徐玉滨冯雨晴马琳崔扬
Owner HARBIN INST OF TECH
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