OFDM relay network resource allocation method based on simultaneous wireless transmission of information and energy

A technology of wireless transmission and relay network, which is applied in the directions of radio transmission system, transmission path separation device, wireless communication, etc. It can solve the problems of not considering the power output capability of sub-carriers, inability to transmit information, etc., and improve the optimization complexity. , the effect of strengthening the coverage

Active Publication Date: 2020-03-17
CERTUS NETWORK TECHNANJING
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] 1) This method does not consider the power output capability of each subcarrier: in a certain time slot, it is possible to allocate a very large power to a certain subcarrier of the source node, which is unreasonable in reality
[0006] 2) Relay nodes are not included: each time slot energy access point only selects some subcarriers to transmit energy to the source node, but cannot transmit information

Method used

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  • OFDM relay network resource allocation method based on simultaneous wireless transmission of information and energy
  • OFDM relay network resource allocation method based on simultaneous wireless transmission of information and energy
  • OFDM relay network resource allocation method based on simultaneous wireless transmission of information and energy

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with embodiment and accompanying drawing:

[0028] 1. Two-way Cognitive Wireless Relay Network Model

[0029] The present invention considers a SWIPT-based OFDM relay network, such as figure 1 As shown, it includes a source node S, a relay node R and a destination node D, the relay node is an energy collection node, and the initial energy in the battery is E 0 . The system includes two time slots of equal length, and the duration of each time slot is unitized as 1, and the conclusion drawn by the present invention can be extended to any length of time slot. At the same time, the total system bandwidth is W, which is divided into N equal-width orthogonal subcarriers, and the subcarriers are represented by subscripts n∈N={1,...,N}. The relay works in half-duplex mode. In the first time slot, S transmits wireless energy transmission (wireless energy transmission, WET) to R through some subcarriers, and...

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Abstract

The invention discloses an OFDM relay network resource allocation method based on simultaneous wireless transmission of information and energy. Under the conditions of satisfying the source node peak power limit, each subcarrier peak power limit and the relay node energy causality limit, the method constructs Optimization model for system throughput. Under the condition that the subcarrier allocation strategy of the source node is given, the optimal criterion that the original problem satisfies is given. Then, by setting the total power of the source node energy transmission, the original problem is decoupled into two separate throughput maximization sub-problems, which greatly reduces the complexity of solving the original problem. The decoupled sub-problems are solved by water injection. Finally, the present invention proposes four subcarrier allocation schemes, which are energy priority scheme, information priority scheme, balanced allocation scheme and exhaustive scheme, and the first three schemes can significantly reduce the complexity of subcarrier allocation.

Description

technical field [0001] The invention discloses an OFDM relay network resource allocation method based on simultaneous wireless information and power transfer (SWIPT) and belongs to the technical field of wireless communication. Background technique [0002] SWIPT refers to using the same radio waves to transmit information and energy to the receiving end, and the receiving end can use them to decode information and collect energy respectively, thereby prolonging the life cycle of energy-constrained devices, reducing charging costs, and improving the performance of wireless networks . There are currently two mainstream SWIPT strategies: power splitting (power splitting, PS) SWIPT strategy and time switching (time switching, TS) SWIPT strategy. The power division SWIPT strategy refers to dividing the power sent by the sender into two parts according to a certain ratio coefficient, and the receiver uses the two parts of power for decoding information and collecting energy resp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04L27/26H04W52/34H04W52/36H04W72/04H04W72/08H04W16/26H04W88/04H04B7/155
CPCH04L5/0008H04L5/001H04L27/2614H04W52/346H04W52/362H04W72/0453H04W72/0473H04B7/15507H04W16/26H04W88/04H04W72/54H04W72/53
Inventor 朱琦谢振威朱洪波杨龙祥
Owner CERTUS NETWORK TECHNANJING
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