OFDM-based oversampling signal demodulation method and system and receiving end

A signal demodulation and oversampling technology, applied in the field of OFDM-based oversampling signal demodulation, can solve the problem of high power consumption of Wi-Fi technology, and achieve the goal of improving communication coverage, reducing communication power consumption, and improving battery life. Effect

Active Publication Date: 2018-11-02
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides an OFDM-based oversampling signal demodulation method, receiving end and system, thereby solving the technical problem of high power consumption of traditional Wi-Fi technology

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  • OFDM-based oversampling signal demodulation method and system and receiving end
  • OFDM-based oversampling signal demodulation method and system and receiving end

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[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0031] Since IoT terminal devices have high requirements on energy consumption in the communication process, high power consumption is often accompanied by extremely poor user experience and device endurance, so it is proposed to reduce the sampling rate of IoT terminal OFDM signal transmission equipment to reduce the The power consumption method of networked terminal equipment, and put the sign...

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Abstract

The invention discloses an OFDM-based oversampling signal demodulation method and system and a receiving end, which are applied to an asymmetric communication architecture with a larger first signal sampling rate of the receiving end than a second signal sampling rate of a sending end. The method comprises the following steps that the receiving end carries out oversampling on a continuous OFDM signal in a time domain at the first signal sampling rate in order to obtain an oversampling OFDM signal in the time domain, and the receiving end carries out compensation calibration on the oversamplingOFDM signal to realize phase synchronization by utilizing a characteristic that a phase difference exists when the oversampling OFDM signal with the time delay in the time domain is mapped to a frequency domain; and the receiving end utilizes a kernel density estimation algorithm and a maximum likelihood decoding algorithm to demodulate the oversampling OFDM signal after compensation calibrationin order to restore an original signal. By means of the method, the system and the receiving end, the power consumption of the sending end can be reduced while the accuracy of signal demodulation is improved.

Description

technical field [0001] The invention belongs to the field of wireless communication, and more specifically relates to an OFDM-based oversampling signal demodulation method, receiving end and system applied in the low-power asymmetric communication architecture of the Internet of Things. Background technique [0002] As we all know, with the rapid progress of the information age, user application requirements are diverse, which promotes the vigorous development of the Internet of things (IoT) technology and spawns a large number of new IoT protocols. Massive IoT devices have been put into use, bringing great convenience to people's lives. By 2015, the scale of my country's Internet of Things industry has exceeded 750 billion yuan; it is estimated that by 2020, the scale of my country's Internet of Things industry will exceed 1.5 trillion yuan, and the number of Internet of Things devices in the world will reach as many as 20 billion. [0003] In this context, many scholars a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2644H04L27/2649H04L27/2655
Inventor 王巍江涛张黔
Owner HUAZHONG UNIV OF SCI & TECH
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