Abstract
Filter-bank multi-carrier (FBMC) modulations, and more specifically FBMC-offset quadrature amplitude modulation (OQAM), are seen as an interesting alternative to orthogonal frequency division multiplexing (OFDM) for the 5th generation radio access technology. In this paper, we investigate the problem of peak-to-average power ratio (PAPR) reduction for FBMC-OQAM signals. Recently, it has been shown that FBMC-OQAM with trellis-based selected mapping (TSLM) scheme not only is superior to any scheme based on symbol-by-symbol approach but also outperforms that of the OFDM with classical SLM scheme. This paper is an extension of that work, where we analyze the TSLM in terms of computational complexity, required hardware memory, and latency issues. We have proposed an improvement to the TSLM, which requires very less hardware memory, compared to the originally proposed TSLM, and also have low latency. Additionally, the impact of the time duration of partial PAPR on the performance of TSLM is studied, and its lower bound has been identified by proposing a suitable time duration. Also, a thorough and fair comparison of performance has been done with an existing trellis-based scheme proposed in literature. The simulation results show that the proposed low-latency TSLM yields better PAPR reduction performance with relatively less hardware memory requirements.
Highlights
Filter-bank multi-carrier (FBMC)-based systems, clubbed with offset quadrature amplitude modulation (OQAM), is being seriously considered for future communication systems
We have studied the impact of traceback depth parameter ∂, which heavily impacts in the peak-to-average power ratio (PAPR) reduction performance and in the latency and hardware memory requirements
At complementary cumulative density function (CCDF) of PAPR equal to 10−3 in Fig. 8, we can infer that the FBMC-OQAM with trellis-based selected mapping (TSLM) leads the multi-block joint optimization (MBJO)-partial transmit sequence (PTS) scheme in PAPR reduction by roughly 0.7 and 0.2 dB for U = 3 and U = 14, respectively
Summary
Filter-bank multi-carrier (FBMC)-based systems, clubbed with offset quadrature amplitude modulation (OQAM), is being seriously considered for future communication systems. FBMC-OQAM has many attractive features such as excellent frequency localization, a power spectral density (PSD) with very low side lobes, an improved robustness to time-variant channel characteristics, and carrier frequency offsets. Bulusu et al EURASIP Journal on Advances in Signal Processing (2016) 2016:132 multi-block joint optimization (MBJO) has been introduced Inspired by this trellis-based approach, a novel trellis-based SLM (TSLM) scheme has been presented in [19]. The rest of the paper is organized as follows: Section 2 gives a brief overview of the FBMC-OQAM signal structure and the impact of their overlapping nature. The complementary cumulative density function (CCDF) of PAPR of a signal quantifies how frequent the PAPR exceeds a given threshold value γ , and it is defined as Pr{PAPRx[n] ≥ γ }
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