Based on the Overlapped Multiplexing Principle[12],a frequency domain OVFDM(Overlapped Frequency Domain Multiplexing)Coding is proposed.By the data weighted shift overlapped version of any band-limited Multiplexing Tr...Based on the Overlapped Multiplexing Principle[12],a frequency domain OVFDM(Overlapped Frequency Domain Multiplexing)Coding is proposed.By the data weighted shift overlapped version of any band-limited Multiplexing Transfer Function H(f)the coding gain and spectral efficiency are both achieved.The heavier the overlap of the data weighted Multiplexing Transfer Function H(f),the higher the coding gain and spectral efficiency as well as the closer the output to the optimum complex Gaussian distribution.The bit error probability performance is estimated.The time domain OVTDM(Overlapped Time Domain Multiplexing)Coding,the dual of OVFDM in time domain is incidentally proposed as well.Both theoretical analysis and testified simulations show that OVFDM(OVTDM)is suitable for high spectral efficiency application and its spectral efficiency is only roughly linear to SNR rather than the well-known logarithm to SNR.展开更多
丢包现象严重影响VoIP的通话语音质量。WSOLA(Waveform Similarity Based Overlap-Add)算法是一种基于接收端的丢包隐藏方法,可以较好地提高语音质量。在介绍WSOLA算法原理的基础上,针对该算法中计算互相关系数所需计算量较大,会增加过...丢包现象严重影响VoIP的通话语音质量。WSOLA(Waveform Similarity Based Overlap-Add)算法是一种基于接收端的丢包隐藏方法,可以较好地提高语音质量。在介绍WSOLA算法原理的基础上,针对该算法中计算互相关系数所需计算量较大,会增加过多计算延时的问题,提出一种互相关系数计算的改进方法。最后通过仿真对重建语音信号质量进行了对比。展开更多
基金The NNSF(National Nature Science Foundation)of China for their continuously long term support by key projects
文摘Based on the Overlapped Multiplexing Principle[12],a frequency domain OVFDM(Overlapped Frequency Domain Multiplexing)Coding is proposed.By the data weighted shift overlapped version of any band-limited Multiplexing Transfer Function H(f)the coding gain and spectral efficiency are both achieved.The heavier the overlap of the data weighted Multiplexing Transfer Function H(f),the higher the coding gain and spectral efficiency as well as the closer the output to the optimum complex Gaussian distribution.The bit error probability performance is estimated.The time domain OVTDM(Overlapped Time Domain Multiplexing)Coding,the dual of OVFDM in time domain is incidentally proposed as well.Both theoretical analysis and testified simulations show that OVFDM(OVTDM)is suitable for high spectral efficiency application and its spectral efficiency is only roughly linear to SNR rather than the well-known logarithm to SNR.
文摘丢包现象严重影响VoIP的通话语音质量。WSOLA(Waveform Similarity Based Overlap-Add)算法是一种基于接收端的丢包隐藏方法,可以较好地提高语音质量。在介绍WSOLA算法原理的基础上,针对该算法中计算互相关系数所需计算量较大,会增加过多计算延时的问题,提出一种互相关系数计算的改进方法。最后通过仿真对重建语音信号质量进行了对比。
