近年来,超宽带(Ultra-wideband,UWB)通信技术因其具有数据传输速率高、功耗低、保密性高、成本低等诸多优点,成为室内高速数据传输的一种有效解决方案。由于高速通信下码间串扰极大地影响了UWB系统的接收性能,需要在解调前采用Rake接收...近年来,超宽带(Ultra-wideband,UWB)通信技术因其具有数据传输速率高、功耗低、保密性高、成本低等诸多优点,成为室内高速数据传输的一种有效解决方案。由于高速通信下码间串扰极大地影响了UWB系统的接收性能,需要在解调前采用Rake接收机和均衡等手段消除码间串扰。针对自适应最小误码率(Adaptive Minimum Bit Error Rate,AMBER)均衡算法与Rake接收机结合进行研究,提出了一种变步长自适应最小误码率(Variable Step-Adaptive Minimum Bit Error Rate,VS-AMBER)均衡算法,在较低信噪比和较高信噪比情况下分别使用不同的变步长方案,较高信噪比下在收敛速度和收敛精度上有所提升,较低信噪比下降低了误码率和功耗。展开更多
A novel all-optical bit-error indicating scheme based on self-phase modulation and band-pass filtering is proposed.In this scheme,the amplified original bit stream propagates through a high-nonlinear fiber where self-...A novel all-optical bit-error indicating scheme based on self-phase modulation and band-pass filtering is proposed.In this scheme,the amplified original bit stream propagates through a high-nonlinear fiber where self-phase modulation occurs,and then passes through a band-pass filter to be converted to a bit-error indicating signal.In the bit-error indicating signal,the error bit has the highest peak power,and the "1" and "0" bits have lower ones.At the same time,the bit-error indicating signal is synchronous with the delayed original bit stream.Therefore,the position of the error bit in the original bit stream can be identified by setting only one judge threshold in the bit error indicating signal.The performance of this scheme has been demonstrated for an 80 Gb/s bit-stream with return-to-zero format by simulation.The results show that the proposed scheme can be used for the all-optical bit-error indicating of the super high bit-rate systems with the return-to-zero format.展开更多
文摘近年来,超宽带(Ultra-wideband,UWB)通信技术因其具有数据传输速率高、功耗低、保密性高、成本低等诸多优点,成为室内高速数据传输的一种有效解决方案。由于高速通信下码间串扰极大地影响了UWB系统的接收性能,需要在解调前采用Rake接收机和均衡等手段消除码间串扰。针对自适应最小误码率(Adaptive Minimum Bit Error Rate,AMBER)均衡算法与Rake接收机结合进行研究,提出了一种变步长自适应最小误码率(Variable Step-Adaptive Minimum Bit Error Rate,VS-AMBER)均衡算法,在较低信噪比和较高信噪比情况下分别使用不同的变步长方案,较高信噪比下在收敛速度和收敛精度上有所提升,较低信噪比下降低了误码率和功耗。
基金Supported by the National Natural Science Foundation of China (Grant No. 60377021)Foundation of New Century Excellent Talents in University (Grant No. NCET-07-0152)Sichuan Scientific Funds for Young Researchers (Grant No. 08ZQ026-012)
文摘A novel all-optical bit-error indicating scheme based on self-phase modulation and band-pass filtering is proposed.In this scheme,the amplified original bit stream propagates through a high-nonlinear fiber where self-phase modulation occurs,and then passes through a band-pass filter to be converted to a bit-error indicating signal.In the bit-error indicating signal,the error bit has the highest peak power,and the "1" and "0" bits have lower ones.At the same time,the bit-error indicating signal is synchronous with the delayed original bit stream.Therefore,the position of the error bit in the original bit stream can be identified by setting only one judge threshold in the bit error indicating signal.The performance of this scheme has been demonstrated for an 80 Gb/s bit-stream with return-to-zero format by simulation.The results show that the proposed scheme can be used for the all-optical bit-error indicating of the super high bit-rate systems with the return-to-zero format.
