access icon free Frequency-domain channel equalisation for LTE-based uplink narrowband Internet of Things systems

© The Institution of Engineering and Technology
Received 19/03/2018, Accepted 22/10/2018, Revised 12/09/2018, Published 23/10/2018

An emerging narrowband radio technology named narrowband Internet of Things (NB-IoT) based on cellular communications has been standardised by the 3rd Generation Partnership Project in release-13. It is specifically designed to provide low-power wide-area connectivity for the IoT. In this study, the authors derive an analytical signal model for Long Term Evolution (LTE)-based uplink NB-IoT systems. The problem of channel equalisation for the uplink NB-IoT systems having mismatched baseband processing and sampling rate between transmitter and receiver is addressed. A relation between the channel impulse response and the channel frequency-domain equalisation coefficients is derived under imbalanced baseband processing and sampling rate environment. Accordingly, a novel one-tap frequency-domain channel equalisation algorithm specific to NB-IoT uplink systems is proposed based on the resultant channel coefficients. Comprehensive link-level simulations are carried out to validate the potentiality of the proposed equalisation method, compared with other conventional techniques like zero forcing and minimum mean square error equalisers in terms of symbol error rate and throughput against signal-to-noise ratio. Simulation results indicate that the proposed equaliser outperforms the existing linear equalisers for all cases of evaluation.

Inspec keywords: 3G mobile communication; cellular radio; wireless channels; radio receivers; frequency-domain analysis; Long Term Evolution; Internet of Things; error statistics; equalisers; radio transmitters

Other keywords: resultant channel coefficients; analytical signal model; equalisation method; sampling rate environment; throughput; LTE-based uplink narrowband Internet-of-Things systems; 3rd Generation Partnership Project; one-tap frequency-domain channel equalisation; narrowband radio technology; cellular communications; symbol error rate; narrowband Internet-of-Things; channel impulse response coefficient; Long Term Evolution-based uplink NB-IoT systems; low-power wide-area connectivity; mismatched baseband processing; channel frequency-domain equalisation coefficient; comprehensive link-level simulations; imbalanced baseband processing

Subjects: Computer communications; Mobile radio systems; Other topics in statistics; Communication channel equalisation and identification

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