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

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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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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