Downlink transmission interference suppression method of aggregation node of wireless sensor network
A sensor node, wireless sensor technology, applied in the directions of wireless communication, network topology, electrical components, etc., can solve the problem of increasing communication energy consumption, increasing the training signal of the signal transmitter and the feedback signal traffic of the signal receiver, and the inability to effectively apply wireless Sensor scene, etc.
Active Publication Date: 2014-07-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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However, in practical applications, accurate channel state information is mostly obtained by statistically averaging a large number of channel state information samples according to the theorem of large numbers. consumption
Therefore, the above method is only suitable for wireless communication systems with sufficient energy supply, and cannot be effectively applied to wireless sensor scenarios with limited energy
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[0115] This example is aimed at figure 2 The shown schematic diagram of the downlink transmission interference scenario of the convergence node of the wireless sensor network further describes the present invention in detail. This scenario includes 1 aggregation node and N sensor nodes, wherein the aggregation node and the sensor nodes are respectively configured with M antennas and a single antenna. In the process of transmitting signals from the sink node to the sensor node, the sink node first evaluates the data signal x sent to the nth sensor node n (n=1,2,...,N) multiplied by the corresponding downlink transmission weight vector w n , and then send out the data signals of all sensor nodes at the same time. Due to the broadcast characteristics of wireless transmission, the signal received by the nth sensor node contains the useful signal S sent from the sink node n =w n x n , and the interference signal I sent from the sink node to other sensor nodes n ={S i |i=1,2...
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The invention discloses a downlink transmission interference suppression method of an aggregation node of a wireless sensor network. The method comprises the following steps that the aggregation node sends training signals to all sensor nodes in the network; all the sensor nodes obtain channel self-correlation matrixes between the sensor nodes and the aggregation node and feed the channel self-correlation matrixes back to the aggregation node; the aggregation node uses the channel self-correlation matrixes as samples for reflecting the channel state information, and the interference suppression optimization problem with the minimum downlink transmission total power of the aggregation node as a target function and the receiving signal interference noise ratio and the interference signal power limitation of the sensor nodes as the constraint conditions is constructed; the optimization problem is processed and converted to be the problem of a standard support vector regression, and then the downlink transmission weight vectors of the aggregation node relative to the sensor nodes are obtained by solution; the aggregation node achieves the interference signal suppression by multiplying the target signals of the sensor nodes by the corresponding downlink transmission weight vectors in the signal transmission stage. The method lowers the node communication energy consumption and prolongs the life cycle of the sensor nodes.
Description
technical field [0001] The invention relates to the technical field of wireless sensor networks, in particular to a method for suppressing downlink transmission interference of a convergence node of a wireless sensor network. Background technique [0002] The wireless sensor network is composed of a large number of miniature sensor nodes deployed in the sensing area, and forms a self-organizing network system through wireless communication. interact. In a wireless sensor network, the sink node is usually larger than the sensor node and can be configured with multiple antennas. Therefore, during the downlink transmission process of the sink node, the sensor node will inevitably be interfered by downlink transmission signals from other sensor nodes, making Data transfer performance drops drastically. In addition, since the sink nodes and sensor nodes are usually powered by batteries, it is difficult to obtain energy supplements once they are deployed. Therefore, how to reduc...
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IPC IPC(8): H04W24/02H04W52/24H04W84/18
Inventor 庄毅欧阳键顾晶晶刘佳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS