Abstract
Universal filtered multi-carrier (UFMC) systems offer a flexibility of filtering arbitrary number of subcarriers to suppress out of band (OoB) emission, while keeping the orthogonality between subcarriers and robustness to transceiver imperfections. Such properties enable it as a promising candidate waveform for Internet of Things (IoT) communications. However, subband filtering may affect system performance and capacity in a number of ways. In this paper, we first propose the conditions for interference-free one-tap equalization and corresponding signal model in the frequency domain for UFMC system. The impact of subband filtering on the system performance is analyzed in terms of average signal-to-noise ratio (SNR), capacity and bit error rate (BER) and compared with the orthogonal frequency division multiplexing (OFDM) system. This is followed by filter length selection strategies to provide guidelines for system design. Next, by taking carrier frequency offset (CFO), timing offset (TO), insufficient guard interval between symbols and filter tail cutting (TC) into consideration, an analytical system model is established. In addition, a set of optimization criteria in terms of filter length and guard interval/filter TC length subject to various constraints is formulated to maximize the system capacity. Numerical results show that the analytical and corresponding optimal approaches match the simulation results, and the proposed equalization algorithms can significantly improve the BER performance.
Highlights
As a promising air-interface waveform candidate solution for the 5th generation wireless communications and beyond, universal filtered multi-carrier (UFMC) has drawn significant attentions by academia and industry in the last few years [1]–[5]
Simulations are performed in three 3rd Generation Partnership Project (3GPP) specified channel models, i.e., Extended Pedestrian-A (EPA), Extended Vehicular-A (EVA) and Extended Typical Urban (ETU) [6] as well as International Telecommunication Union (ITU) specified channel model for Hilly Terrain (HT)
We provide the results of ideal case for both UFMC and OFDM systems as benchmarks
Summary
As a promising air-interface waveform candidate solution for the 5th generation wireless communications and beyond, universal filtered multi-carrier (UFMC) has drawn significant attentions by academia and industry in the last few years [1]–[5]. Comparing with filter-bank multi-carrier (FBMC) system [8], [9], UFMC system provides flexibility to filter a subband that consists of an arbitrary number of consecutive subcarriers, which provide a possibility of utilizing fragmented spectrum for short package communication, such as narrowband Internet of Things (NB-IoT). It has been reported in [10] and [11] that UFMC system is more robust to transceiver imperfections such as carrier frequency offset (CFO) and timing offset (TO), which is a critical design criterion for a waveform when employed in multi-cell cooperation scenarios and low-. In addition to the benefits in performance and the OoB emission, the most significant advantage of the UFMC system over OFDM system is the design flexibility, which enables the system to adapt to the requirements of specific user, service types and channels by adjusting the subband filter and system parameters
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