A source coding method with high transmission energy efficiency in wireless sensor networks based on ook modulation

Abstract

Provided is an on-off keying (OOK) modulation-based source coding method of high transmitted energy efficiency in a wireless sensor network. A various length codeword collection selecting method is used for constructing a codeword collection which reaches a preset code rate and has low codeword average weight, and an encoding and decoding method based on code table inquiring is used for encoding and decoding. The codeword collection selecting method constructs a complete binary tree, each leaf node of the binary tree represents a codeword, then an operation is conducted to continuously cut and expand the leaf nodes to reduce average weight of codewords, until the code length reaches thresh value, the operation to the leaf nodes is finished. According to the encoding and decoding method based on code table inquiring, information in an information collection is matched up with the codewords in the codeword collection one by one and is saved in nodes of each sensor in a tabular form, the information is mapped on transmitting nodes by inquiring the code table, and the codewords are decoded into information on receiving nodes by inquiring the code table. The OOK modulation-based source coding method of the high transmitted energy efficiency in the wireless sensor network has the advantages of being high in code rate and capable of reducing energy consumption of the nodes.

Description

technical field [0001] The invention relates to an energy-saving information source coding method in wireless communication, and the method is suitable for a wireless sensor network adopting OOK modulation. technical background [0002] Wireless sensor networks have very broad prospects in the fields of environmental monitoring, medical and health, industrial automation, and military investigation. Since sensor nodes in sensor networks are usually powered by batteries, their energy is very limited, so how to reduce the energy consumption of nodes and prolong the survival time of the network is one of the key issues to be studied. [0003] The energy consumption of sensor nodes occurs in data acquisition, data processing, data transmission, data reception and other links. Among them, the energy consumed by data transmission will account for a large proportion of the total energy consumption. For example, sending one bit consumes roughly the same amount of energy as processi...

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Problems solved by technology

However, these source coding methods all design a fixed code length prefix code. Although this fixed code length code reduces the number of occurrences of "1" bits, the ratio of the length of the information before encoding to the length of the code word after encoding, that is, the code rate is low. , resulting in low transmission efficiency

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