Abstract
Cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) is the most widespread multicarrier modulation scheme. However, the use of a rectangular filter in CP-OFDM causes poor out-of-band (OoB) radiation. Moreover, the CP causes spectral efficiency loss. To overcome these limitations, a filter bank multicarrier (FBMC) was proposed which uses prototype pulse shaping filters that can be adapted to fulfil the system requirements. The choice of the filter is crucial for FBMC/offset quadrature amplitude modulation (OQAM) due to its significant impact on the achieved performance. In this paper, new prototype pulse shaping filters in FBMC/OQAM systems are proposed, aiming to improve the system performance. A number of prototype pulse shaping filters, such as raised cosine pulse (RC), root raised cosine pulse (RRC), better than raised cosine pulse (BTRC), modified Bartlett-Hanning (MBH), improved sinc power pulse (ISP), phase modified sinc pulse (PMSP), parametric linear pulse (PLP), linear combination pulse (LCP), PHYDYAS and Hermite, are considered. The performance of each pulse shaping filter in FBMC/OQAM is evaluated and compared other in terms of the power spectral density (PSD), spectral efficiency, signal-to-interference ratio (SIR), time offset (TO), carrier frequency offset (CFO) and bit error rate (BER) performance over various channels. In addition, as multiple input multiple output (MIMO) is one of the main challenges associated with FBMC, we propose the new approach that use the frequency/time block spreading based on a Walsh-Hadamard (WH) code in MIMO FBMC/OQAM and investigate the combination of the our proposed prototype pulse shaping filters with MIMO systems. The proposed filters are shown to be suitable candidates for FBMC/OQAM systems.
Highlights
Next-generation mobile communication systems necessitate the improvement of wireless systems to meet the new requirements in network scenarios such as ultra-reliable and low latency communications (URLLC), enhanced mobile broadband and massive machine-type communications [1]
AND DISCUSSIONS the performance of the proposed prototype pulse shaping filters in filter bank multicarrier (FBMC)/offset quadrature amplitude modulation (OQAM) systems is evaluated via simulation results obtained using MATLAB 2018a software
In this work, new prototype pulse shape filters are proposed to improve the performance of FBMC/OQAM systems
Summary
Next-generation mobile communication systems necessitate the improvement of wireless systems to meet the new requirements in network scenarios such as ultra-reliable and low latency communications (URLLC), enhanced mobile broadband (eMBB) and massive machine-type communications (mMTC) [1]. The authors in [75], [76] introduced a very effective solution to recover complex orthogonality in FBMC by spreading data symbols in frequency or time These techniques enable to apply of all MIMO methods that may be used in OFDM to FBMC. We employ WH spreading [75], [76] to propose a new MIMO FBMC/OQAM approach using the proposed pulse shaping filters, evaluate the performance of these approaches with well-known MIMO schemes and compare them with PHYDYAS, Hermite in FBMC and CP-OFDM. We summarize the main contributions of this paper as follows: 1) New prototype pulse shape filters are proposed to improve the performance of FBMC/OQAM systems.
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