Matched filtering at the backscatter device forces the effective backscatter channel to have a common phase across subcarriers, enabling reliable joint channel estimation and data detection via the EM algorithm.
Securing the Internet of Things: A standardization perspective,
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Matched-Filter based Backscatter Communication for IoT Devices over Ambient OFDM Carrier
Matched filtering at the backscatter device forces the effective backscatter channel to have a common phase across subcarriers, enabling reliable joint channel estimation and data detection via the EM algorithm.