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Time allocation method for optimal transmission time slot of wireless charging relay network under cochannel interference

A technology of co-channel interference and relay network, applied in the field of optimal transmission time slot time allocation of wireless charging relay network, can solve the problem of harmful and useful information

Inactive Publication Date: 2016-07-20
XI AN JIAOTONG UNIV
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Problems solved by technology

However, in the actual wireless transmission system, due to the use of frequency reuse technology, coherent interference is inevitable. In the past, this interference was considered harmful to the transmission of useful information, but due to the emergence of energy harvesting technology, this part Interference can also be used as a part of the energy source of the transmitted power of the source node

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  • Time allocation method for optimal transmission time slot of wireless charging relay network under cochannel interference
  • Time allocation method for optimal transmission time slot of wireless charging relay network under cochannel interference
  • Time allocation method for optimal transmission time slot of wireless charging relay network under cochannel interference

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] Suppose the network includes a hybrid access point a, a source node s, and a relay node r, h is the channel state information between the access point and the relay, g is the channel state information between the relay and the source node, The distance from the access point to the relay is d 1 , the distance from the source node to the relay is d 2 .

[0027] see Figure 1 to Figure 3 , the optimal transmission slot time allocation method of the wireless charging relay network under co-channel interference of the present invention, comprising the following steps:

[0028] 1) In the downlink transmission, the hybrid access point uses the optimal time length α * T broadcasts energy signals, due to the existence of interference sources, the relay collects energy from hybrid access points and interference sources respectively, and uses t...

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Abstract

The invention discloses a time allocation method for an optimal transmission time slot of a wireless charging relay network under cochannel interference. A complete transmission duration is T and is divided into two stages. The time allocation method comprises the following steps: firstly, in downlink transmission, a hybrid access point broadcasts an energy signal to a relay at an optimal time length alpha*T, at the same time, the relay starts to collect energy for uplink transmission, due to the existence of interference, the energy source collected by the relay comprises the hybrid access point and an interference source; and secondly, in the uplink transmission, a source node broadcasts information for a duration (1-alpha*)T / 2, and then a relay node forwards the information in the rest duration according to whether the decoding is correct or not. By adopting the time allocation method disclosed by the invention, an optimal time allocation proportion alpha* can be obtained quickly.

Description

Technical field: [0001] The invention relates to a wireless energy transmission relay network in the technical field of mobile communication, in particular to a method for allocating optimal transmission time slots of a wireless charging relay network under co-channel interference. Background technique: [0002] In energy-constrained wireless networks, such as wireless sensor networks, nodes are usually equipped with fixed energy supply devices, such as batteries. In this way, in scenarios where it is inconvenient to charge or replace the battery, the life time of the network will be limited. Harvesting energy from the natural environment, such as solar energy and wind energy, provides a new energy supply method for the relay network. In addition to these commonly used energy sources, the way of harvesting energy from radio frequency signals has attracted more and more attention. There are mainly two receiving methods: TS (timeswitching) and PS (powersplitting). One scenar...

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Application Information

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IPC IPC(8): H04W72/04H04B7/155
CPCH04B7/15564H04B7/15592H04W72/0446
Inventor 张超陈亚伟
Owner XI AN JIAOTONG UNIV
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