Narrowband Internet of Things downlink receiving method based on channel estimation and retransmission soft combination

Narrowband Internet of Things downlink receiving method based on channel estimation and retransmission soft combination

The invention discloses a narrowband Internet of Things downlink receiving method based on channel estimation and retransmission soft combination. The method comprises the following steps of: definingan autocorrelation matrix; carrying out eigenvalue decomposition on the autocorrelation matrix to si...

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Hauptverfasser: ZENG HUI, RONG QILONG, LIU WEI
Format: Patent
Sprache:chi ; eng
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ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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creator ZENG HUI
RONG QILONG
LIU WEI
description The invention discloses a narrowband Internet of Things downlink receiving method based on channel estimation and retransmission soft combination. The method comprises the following steps of: definingan autocorrelation matrix; carrying out eigenvalue decomposition on the autocorrelation matrix to simplify an LMMSE algorithm so as to complete channel impact response of an estimation frequency domain, thus obtaining hMMSE; performing time domain filtering on the hMMSE by using fast Fourier transform to suppress the influence of noise; on the basis of the S3, carrying out one-dimensional linearinterpolation processing on the OFDM symbol containing the NRS in the frequency domain; acquiring channel impact response estimated values of frequency domains of all sent symbols through time domainaveraging; and repeatedly transmitting the soft information with the transmitting signal probability obtained by demodulation, and using equal gain combination, thus improving the performance of the system. According to the inv
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subjects ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
title Narrowband Internet of Things downlink receiving method based on channel estimation and retransmission soft combination
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