Abstract
In order to address the shortcomings of orthogonal frequency division multiplexing (OFDM) and extend the lifetime of energy-constrained Internet-of-Things (IoT) devices, the combination of filter bank multi-carrier (FBMC) and simultaneous wireless information and power transfer (SWIPT) is investigated in this paper. Specifically, a multi-user FBMC-based SWIPT system is proposed in which user nodes (UNs) have the capability for both energy harvesting (EH) and information decoding (ID) with the aid of separate antennas. A practical non-linear EH model, which considers the saturation effects of the EH circuit, is considered. The information receiver at both the UNs and base station (BS) adopts an iterative interference cancellation (IIC) receiver to cancel the intrinsic interference in the demodulated FBMC signal. A sum-rate maximization problem is solved to jointly optimize parameters such as time, power, and weight allocations. Sub-optimal schemes are proposed for comparison. Numerical results show that the optimal solution significantly outperforms the sub-optimal methods in terms of achievable sum-rate and amount of harvested energy. Moreover, the results show that the proposed algorithm converges within a few iterations.
Highlights
I N 5G new radio (NR), orthogonal frequency division multiplexing (OFDM) has been adopted as the modulation format for the physical layer (PHY) due to its many advantages, such as ease of implementation and backward compatibility with the existing 4G network
It can be observed from these plots that the time and weight resource (TRS) allocations of both user nodes (UNs) are similar for both UL and DL
In a multi-user IoT network with energy-constrained devices, simultaneous wireless information and power transfer (SWIPT) can serve as a source of power for UNs and provide network self-sustainability
Summary
I N 5G new radio (NR), orthogonal frequency division multiplexing (OFDM) has been adopted as the modulation format for the physical layer (PHY) due to its many advantages, such as ease of implementation and backward compatibility with the existing 4G network. For new 5G use cases, such as massive Machine-Type Communication (mMTC), the overhead and delay involved in the synchronization procedure can be significant due to the high connection density. For such applications it is desirable to allow contention-based grant-free or asynchronous transmissions, in which each user node (UN) operates in a wake-up-and-transmit manner [1]. OFDM systems have been shown to perform poorly in asynchronous transmissions [2].
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