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Power distribution system and method in wireless sensor network based on collaborative transmission

A wireless sensor and cooperative transmission technology, applied in transmission systems, digital transmission systems, baseband system components, etc., to achieve the effect of improving system bit error performance

Inactive Publication Date: 2008-08-13
JIAXING WIRELESS SENSOR NETWORKS CENT CAS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing technical solutions are only limited to channel flat fading conditions or use OFDM technology to combat multipath fading

Method used

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  • Power distribution system and method in wireless sensor network based on collaborative transmission
  • Power distribution system and method in wireless sensor network based on collaborative transmission
  • Power distribution system and method in wireless sensor network based on collaborative transmission

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Embodiment Construction

[0042] Please refer to Fig. 1 and Fig. 3, the power allocation method in the wideband wireless sensor network based on the single carrier frequency domain equalization technology and the decoding and forwarding cooperative transmission technology of the present invention mainly includes the following steps:

[0043] Step 1: In a broadband wireless sensor network, the sink node estimates the N-point frequency-domain impulse response value h of the wireless multipath channel between the source node and the relay node and the sink node through the channel estimation module assisted by the training sequence S and h R . The estimated channel state information h S and hR Including propagation loss in free space, shadow fading, and the effects of multipath fading on the signal. The source node S shown in FIG. 2 , the relay node R and the sink node D all have only one antenna, and cannot send and receive data at the same time. The source node uses the modulation module to modulate ...

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Abstract

The invention discloses a system and a method for power allocation in a wireless sensor network based on cooperative transmission. The method comprises the steps that: a ancillary estimation module of training sequence estimates the frequency impulse response value of a multi-path fading channel between source nodes, relay nodes and sink nodes; a power allocation calculation module calculates the parameters of a power allocation module according to the numerical relationship of the estimated channel coefficients; a feedback module feedbacks the parameters to the power allocation module; and finally the power allocation module sets its filter group parameters according to the feedback parameters, so that the total sending power of the sending data is self-adaptive allocated. It is the optimization aim of the invention to maximize the signal-to-noise of data received by sink nodes in block mode sink nodes, and the optimized system error rate has improved performance.

Description

technical field [0001] The invention relates to the field of wireless information transmission, in particular to a power distribution system and method in a wireless sensor network based on cooperative transmission. Background technique [0002] Multiple-input multiple-output (MIMO) technology refers to the technology that uses multiple antennas at both the transmitting end and the receiving end, which can significantly improve the capacity of the communication system and the quality of the wireless transmission link, so it has become a research in the field of wireless communication. hotspot. However, due to the influence of factors such as the price and volume of the terminal equipment, it is not practical to configure multiple antennas on the nodes of the wireless sensor network. In order to solve this problem, the two concepts of cooperative communication and virtual multi-antenna came into being. [0003] Cooperative communication technology is a method to exploit spa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L25/03H04L1/06H04L1/00H04L12/28H04W52/34
Inventor 严凯丁盛邱云周朱明华王营冠刘海涛
Owner JIAXING WIRELESS SENSOR NETWORKS CENT CAS
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