An energy-saving relay selection method of a wireless energy collection cooperative communication system

A cooperative communication and wireless energy technology, applied in the direction of wireless communication, energy consumption reduction, sustainable communication technology, etc., can solve the problems that the energy cannot meet the forwarding requirements, and the difficulty of relay selection is increased, so as to achieve optimal utilization and improve system performance Effect

Inactive Publication Date: 2019-05-03
GUANGXI NORMAL UNIV
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Problems solved by technology

Since the relay node may be mobile and the surrounding environment changes randomly, the energy it can collect also presents random characteristics, and some or even all of the EH relay nodes may not meet the forwarding requirements, making the relay selection Increased difficulty

Method used

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Embodiment Construction

[0010] In a wireless EH cooperative communication network consisting of a source node S, a destination node D, and N relay nodes with EH capabilities, the source node uses a transmit power P S Transmit signal, use h S,i And h i,D Respectively represent the channel coefficients of the link from the source node to the relay node i and the link from the relay node i to the destination node, where i=1, 2,...,N. Assuming that the signal transmission distance is long or there are obstacles in the transmission process, there is no direct communication link between the source node and the destination node. A cooperation process includes two time slots, and the length of the time slot is T p In the first time slot, the source node transmits a signal and the relay node receives the signal; in the second time slot, the relay node selected by the relay selection method forwards the signal, and the destination node receives the signal.

[0011] Step 1: Use the energy E possessed by the i-th re...

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Abstract

The invention discloses an energy-saving relay selection method for a wireless energy collection cooperative communication system, which correspondingly adopts a single-relay forwarding strategy and amulti-relay forwarding strategy under the condition that the energy of a relay node with an EH capability meets the forwarding requirement and does not meet the forwarding requirement. When the energy of part of the relay nodes meets the forwarding requirement, an optimal relay node can be selected from the relay nodes to forward a signal at the optimal power; And when the energy of all the relaynodes does not meet the forwarding requirement, forwarding by using the plurality of relay nodes in a cooperative manner, and carrying out signal combination at a receiving end. No matter a single relay forwarding mode or a multi-relay forwarding mode is adopted, energy can be saved as much as possible while effective signal transmission can be guaranteed, utilization of collected energy is optimized, and system performance can be improved.

Description

Technical field [0001] The invention belongs to the field of wireless communication technology, and specifically relates to an energy-saving relay selection method of a wireless energy harvesting cooperative communication system. Background technique [0002] Energy harvesting (EH) technology that obtains energy from renewable energy sources such as solar energy, wind energy, thermal energy, and radio frequency energy can drive communication equipment and networks. In traditional wireless cooperative communication systems, since grid power is used, relay options are not required Consider whether the power of the node is sufficient. For the wireless EH cooperative communication system using EH technology, the relay node needs to rely on its own energy collection to provide electric drive. Therefore, in addition to traditional factors, the relay selection needs to consider the situation of energy collection. Since the relay node may be mobile, the surrounding environment changes r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W40/22H04W40/10H04W40/08H04W40/04
CPCY02D30/70
Inventor 江泽远肖琨
Owner GUANGXI NORMAL UNIV
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