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Multimodule modulation-demodulation self-adaption method for wireless sensing network shortwave one-way communication

A technology of wireless sensor network and one-way communication, which is applied in the field of wireless sensor network short-wave communication and adaptive communication, and can solve the problems of poor transmission effect and high transmission rate

Inactive Publication Date: 2008-11-05
JIAXING WIRELESS SENSOR NETWORKS CENT CAS
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  • Claims
  • Application Information

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Problems solved by technology

[0010] The transmission rate of PSK modulation mode is relatively high, and after adopting equalization technology, it also has certain anti-fading ability, but the transmission effect is poor in the case of poor channel environment, so it is suitable for the case of good channel environment

Method used

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  • Multimodule modulation-demodulation self-adaption method for wireless sensing network shortwave one-way communication
  • Multimodule modulation-demodulation self-adaption method for wireless sensing network shortwave one-way communication
  • Multimodule modulation-demodulation self-adaption method for wireless sensing network shortwave one-way communication

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Embodiment Construction

[0028] The shortwave channel is always changing, and the multipath effect is serious. In order to communicate better under harsh communication conditions, a series of processing must be performed on the signal at the receiving end, in order to reduce interference and fading through a certain way of cancellation , Correct the wrong bits to obtain a lower bit error rate.

[0029] The system adopts a variety of communication modes, the first mode is low-speed stable transmission, and the second mode is high-speed burst transmission. The low-speed stable transmission adopts FTSK transmission mode, which increases the signal energy per bit by reducing the data rate, and reduces the channel influence through parallel transmission mode, and can obtain frequency and time diversity. FTSK is insensitive to noise effects, and can still demodulate correctly under the condition of low signal-to-noise ratio. The high-speed burst transmission adopts BPSK and QPSK modulation methods respecti...

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Abstract

The invention discloses a wireless sensing net short wave one-way communication multiple model modem self-adapting method, which presets a low speed, an intermediate speed and a high speed communication modes at the receiving terminals in the software radio mode, carries communication mode information at the sweep frequency frame head transmitted by the transmitting terminal, and executes modulation to the sweep frequency frame head in a high-reliability modulation mode, thereby the receiving terminal can simultaneously obtain subsequent data communication mode after capturing and confirming the sweep frequency frame head information, and execute demodulation to the subsequent information in corresponding communication mode after the sweep frequency head receiving is completed.

Description

technical field [0001] The invention relates to the field of wireless sensor network short-wave communication and adaptive communication, in particular to a wireless sensor network short-wave one-way communication multi-mode modulation and demodulation adaptive method. Background technique [0002] Wireless sensor network (Wireless Sensor Network, WSN) involves multi-disciplinary highly cross-cutting and knowledge-integrated cutting-edge hot research fields, which integrates sensor technology, embedded computing technology, modern network and wireless communication technology, distributed information processing technology, etc. It can monitor, perceive and collect information of various environments or monitoring objects in real time through various integrated micro-sensors, and send the information wirelessly, and at the same time, it can be transmitted in an ad hoc multi-hop network To the user terminal, so as to realize the connection between the physical world, the compu...

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Application Information

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IPC IPC(8): H04B1/16H04B7/24
Inventor 付耀先袁晓兵
Owner JIAXING WIRELESS SENSOR NETWORKS CENT CAS