Fifth Generation(5G)systems aim to improve flexibility,coexistence and diverse service in several aspects to achieve the emerging applications requirements.Windowing and filtering of the traditional multicarrier wavef...Fifth Generation(5G)systems aim to improve flexibility,coexistence and diverse service in several aspects to achieve the emerging applications requirements.Windowing and filtering of the traditional multicarrier waveforms are now considered common sense when designing more flexible waveforms.This paper proposed a Universal Windowing Multi-Carrier(UWMC)waveform design platform that is flexible,providing more easily coexists with different pulse shapes,and reduces the Out of Band Emissions(OOBE),which is generated by the traditional multicarrier methods that used in the previous generations of the mobile technology.The novel proposed approach is different from other approaches that have been proposed,and it is based on applying a novel modulation approach for the Quadrature-Amplitude Modulation(64-QAM)which is considered very popular in mobile technology.This new approach is done by employing flexible pulse shaping windowing,by assigning windows to various bands.This leads to decreased side-lobes,which are going to reduce OOBE and boost the spectral efficiency by assigning them to edge subscribers only.The new subband windowing(UWMC)will also maintain comprehensively the non-orthogonality by a variety of windowing and make sure to keep window time the same for all subbands.In addition,this paper shows that the new approach made the Bit Error Rate(BER)equal to the conventional Windowed-Orthogonal Frequency Division Multiplexing(W-OFDM).This platform achieved great improvement for some other Key Performance Indicators(KPI),such as the Peak to Average Power Ratio(PAPR)compared with the conventional(W-OFDM)and the conventional Universal Filtered Multicarrier(UFMC)approaches.In particular,the proposed windowing scheme outperforms previous designs in terms of the Power Spectral Density(PSD)by 58%and the(BER)by 1.5 dB and reduces the Complementary Cumulative Distribution Function Cubic Metric(CCDF-CM)by 24%.展开更多
本文给出了一种有效抑制正交频分复用(OFDM:Orthogonal Frequency Division Multiplexing)系统带外功率辐射的方案。采用文中给出的时域加窗技术,可有效降低OFDM系统的带外辐射功率。同利用矩形窗函数OFDM系统相比,本方案列出的窗函数...本文给出了一种有效抑制正交频分复用(OFDM:Orthogonal Frequency Division Multiplexing)系统带外功率辐射的方案。采用文中给出的时域加窗技术,可有效降低OFDM系统的带外辐射功率。同利用矩形窗函数OFDM系统相比,本方案列出的窗函数可以大大降低系统的带外辐射功率,提高系统的频带利用率。仿真结果证明了方案的有效性。展开更多
当水声信道中存在通信带宽范围内的干扰时,会严重影响OFDM(Orthogonal Frequency Division Multiplexing)水声通信系统的误码率,针对该问题提出一种加巴克码窗的正交频分复用方法(WOFDM)并进行了理论分析。WOFDM方法通过对子载波信号在...当水声信道中存在通信带宽范围内的干扰时,会严重影响OFDM(Orthogonal Frequency Division Multiplexing)水声通信系统的误码率,针对该问题提出一种加巴克码窗的正交频分复用方法(WOFDM)并进行了理论分析。WOFDM方法通过对子载波信号在时域加载巴克码窗将信号中的窄带干扰成分近似白化,减小了由其带来的子载波频偏和相位漂移。数值仿真证明,WOFDM水声通信系统能有效地对抗由窄带干扰引起的误码,得到了和理论分析的一致的结果。展开更多
基金supported in part by the Ministry of Higher Education Malaysia through the Fundamental Research Grant Scheme(FRGS/1/2019/TK04/UTHM/02/8)the University Tun Hussein Onn Malaysia.
文摘Fifth Generation(5G)systems aim to improve flexibility,coexistence and diverse service in several aspects to achieve the emerging applications requirements.Windowing and filtering of the traditional multicarrier waveforms are now considered common sense when designing more flexible waveforms.This paper proposed a Universal Windowing Multi-Carrier(UWMC)waveform design platform that is flexible,providing more easily coexists with different pulse shapes,and reduces the Out of Band Emissions(OOBE),which is generated by the traditional multicarrier methods that used in the previous generations of the mobile technology.The novel proposed approach is different from other approaches that have been proposed,and it is based on applying a novel modulation approach for the Quadrature-Amplitude Modulation(64-QAM)which is considered very popular in mobile technology.This new approach is done by employing flexible pulse shaping windowing,by assigning windows to various bands.This leads to decreased side-lobes,which are going to reduce OOBE and boost the spectral efficiency by assigning them to edge subscribers only.The new subband windowing(UWMC)will also maintain comprehensively the non-orthogonality by a variety of windowing and make sure to keep window time the same for all subbands.In addition,this paper shows that the new approach made the Bit Error Rate(BER)equal to the conventional Windowed-Orthogonal Frequency Division Multiplexing(W-OFDM).This platform achieved great improvement for some other Key Performance Indicators(KPI),such as the Peak to Average Power Ratio(PAPR)compared with the conventional(W-OFDM)and the conventional Universal Filtered Multicarrier(UFMC)approaches.In particular,the proposed windowing scheme outperforms previous designs in terms of the Power Spectral Density(PSD)by 58%and the(BER)by 1.5 dB and reduces the Complementary Cumulative Distribution Function Cubic Metric(CCDF-CM)by 24%.
文摘本文给出了一种有效抑制正交频分复用(OFDM:Orthogonal Frequency Division Multiplexing)系统带外功率辐射的方案。采用文中给出的时域加窗技术,可有效降低OFDM系统的带外辐射功率。同利用矩形窗函数OFDM系统相比,本方案列出的窗函数可以大大降低系统的带外辐射功率,提高系统的频带利用率。仿真结果证明了方案的有效性。
文摘当水声信道中存在通信带宽范围内的干扰时,会严重影响OFDM(Orthogonal Frequency Division Multiplexing)水声通信系统的误码率,针对该问题提出一种加巴克码窗的正交频分复用方法(WOFDM)并进行了理论分析。WOFDM方法通过对子载波信号在时域加载巴克码窗将信号中的窄带干扰成分近似白化,减小了由其带来的子载波频偏和相位漂移。数值仿真证明,WOFDM水声通信系统能有效地对抗由窄带干扰引起的误码,得到了和理论分析的一致的结果。
