Abstract
Partial transmit sequence (PTS) scheme has been well applied to reduce the high peak-to-average power ratio (PAPR) of the orthogonal frequency division multiplexing (OFDM) signal. However, due to the signal structure differences between the filter bank multicarrier and offset quadrature amplitude modulation (FBMC/OQAM) signal and the OFDM signal, the conventional PTS scheme is not applicable to the FBMC/OQAM signal. Considering the PAPR reduction issue for the FBMC/OQAM signal, this paper proposes a genetic algorithm (GA) based bilayer partial transmit sequence (GA-BPTS) scheme. In order to reduce the computational complexity, the proposed scheme continues to partition each subblock, transforming the single layer structure of the conventional PTS into a bilayer phase factor search structure, and introduces a penalty threshold. Then the suboptimal phase factor vector is obtained by using the GA. Meanwhile, before PAPR reduction processing, aided by the proposed prototype filter which has the better performance of out-of-band attenuation than the PHYDAYS filter, the GA-BPTS scheme can effectively reduce the PAPR of the FBMC/OQAM signal. The simulations have confirmed that the proposed scheme not only provides an excellent PAPR performance but also decreases the computational complexity compared with the conventional PTS scheme.
Highlights
Orthogonal frequency division multiplexing (OFDM) is one of the most representative multicarrier modulation (MCM) techniques due to its capability to efficiently cope with frequency selective channels for the upcoming fifth generation (5G) broadband wireless communication [1]–[3]
When FBMC/OQAM signals traveling through some nonlinear devices like the transmit power amplifier, the high peak-to-average power ratio (PAPR) could result in the distortion which can lead to the escalation of bit error rate (BER)
FBMC/OQAM signal requires a prototype filter with long length to achieve good performance, but it is hard for practical implementation and is inferior in the future burst communication
Summary
Orthogonal frequency division multiplexing (OFDM) is one of the most representative multicarrier modulation (MCM) techniques due to its capability to efficiently cope with frequency selective channels for the upcoming fifth generation (5G) broadband wireless communication [1]–[3]. Instead of a fixed rectangular pulse shaping window, the prototype filter of the FBMC/OQAM system can be designed with arbitrarily low side lobe energy to effectively improve the spectral efficiency of the FBMC/OQAM system [7], [8]. Based on the well-designed prototype filter, FBMC/OQAM system only requires orthogonality for the neighbouring subchannels and has the ability to prevent the asynchronous signals distortion in adjacent bands [9], [10]. Similar to the OFDM system, the high peak-to-average power ratio (PAPR) of the transmitted signal is still unresolved in the FBMC/OQAM system [11]. When FBMC/OQAM signals traveling through some nonlinear devices like the transmit power amplifier, the high PAPR could result in the distortion which can lead to the escalation of bit error rate (BER).
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