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Energy-saving transmission scheme of opportunity relay system

An energy-saving transmission and relay node technology, applied in the field of communication, can solve the problems of no power, joint optimization of modulation mode and relay node selection, and no consideration of power control in source nodes and relay nodes, so as to reduce transmission power, The effect of reducing the transmit power and reducing the total power consumption

Inactive Publication Date: 2013-04-10
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] None of the above existing relay node selection schemes considers the power control at the source node and the relay node, nor does it jointly optimize the power, modulation scheme and relay node selection

Method used

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  • Energy-saving transmission scheme of opportunity relay system

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Embodiment Construction

[0012] The embodiment of the present invention provides a distributed relay node selection, joint optimization scheme of transmission power and modulation mode, which is used to minimize the total power consumption of the sensor network.

[0013] 1. System model

[0014] refer to figure 1 , the relay network in the embodiment of the present invention consists of M t It consists of source nodes, L relay nodes and a destination node. Assume that there is no direct path between the source node and the destination node. order h sl Indicates the channel vector representing small-scale fading between the source node and the relay node, h ld Indicates the channel coefficient representing small-scale fading between the relay node and the destination node. Wireless channels in the network also experience square rate path loss. The uplink and downlink of wireless channels in the network have reciprocity.

[0015] refer to figure 1 , the working process of the relay network in th...

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Abstract

The invention discloses a united optimization scheme of relay node selection, power transmission and modulation mode, and the united optimization scheme of the relay node selection, the power transmission and the modulation mode is used for minimizing total power consumption of a sensor network. The energy-saving transmission scheme of the opportunity relay system puts forward a calculating method and a relay node selection method enabling the total network power consumption to be minimal under the condition that requirement of error rate of target nodes is met and maximal transmitting power of the nodes is limited. The energy-saving transmission scheme of the opportunity relay system comprises steps as below: all nodes calculate the transmitting power and the modulation mode in a distributed mode, the node which obtains the minimal total network power consumption obtains the right to broadcast information in priority (the information of the broadcast comprises transmitting power and modulation mode of the source node), the source node determines the transmitting power and the modulation mode according to received information, transmits signals in a distributed space-time encoding mode, and the relay node which obtains the minimal total network power consumption decodes the information from the source node and passes the information forward.

Description

technical field [0001] The invention relates to the communication field, in particular to a joint optimization scheme of power control, modulation mode and relay node selection of a wireless sensor network. Background technique [0002] A typical application scenario of a wireless sensor network is that multiple sensor nodes collect information, and then transmit the collected information to the sink node in a multi-hop manner. In a sensor network with only one level of relay, the transmission of data consists of two stages. The first stage: the source node sends information to the relay node and the destination node; the second stage: the relay node forwards the information to the destination node. If multiple relay nodes are included in the network, the traditional method of relay forwarding is that each relay node decodes the received information to forward forward (DF) or amplify forward forward (AF), and then different relay nodes use orthogonal sub-channels Send the ...

Claims

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Application Information

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IPC IPC(8): H04W52/02H04L1/00
CPCY02D30/70
Inventor 唐岚张兴敢柏业超李多一沈欣
Owner NANJING UNIV
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