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全数字接收机中插值滤波器的优化设计 总被引:1,自引:0,他引:1
本文讨论了全数字接收机中插值波器的优化设计问题。利用插值公式的载断式导出码间串扰量的度量式,研究了其收敛特性。利用码间串扰量的度量准则,对不同的成形滤波函数研究了插值滤波器的参数优化估计及其抗时钟抖动性能。 相似文献
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提出了一种提高接收机性能的新方法。该方法通过对信道传输信号波形的特征参数测量,分析传输信号的成形方式,根据成形参数设计最佳接收滤波器,有效降低码间串扰和信道噪声对接收机性能的影响,并在噪声信道环境下进行了仿真研究,使用了采样统计方差、信噪比和眼图3种方法对接收机性能进行分析,结果表明,该方法能够有效提高接收机的性能。 相似文献
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通过RLS时域均衡和匹配滤波法实现了抑制码间串扰(ISI).在Simulink平台下,对这两种方法进行了仿真验证.仿真结果表明,RLS时域均衡器和匹配滤波器可以很好地抑制码间串扰,从而降低误码率,提高信息的传输质量. 相似文献
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在OFDM系统中,时域均衡器用来抵消因循环前缀长度不足而引起的码间串扰。本文提出了一种新的时域均衡器的设计方法,该方法同时考虑了码间串扰和噪声对传输速率的影响。最佳均衡器的系数通过快速傅立叶变换在频域进行计算,并可通过求取矩阵的特,征向量来获得。仿真结果表明所提出来的方法能有效地提高系统传输速率。 相似文献
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Because of the quadratic relation between optical power and optical field, the transmission of optical power through an optical fiber is, in principle, nonlinear. Under usual conditions, random fluctuations of the incoherent source field and mode mixing tend to linearize the system. Previous assessments of the effect of intersymbol interference (ISI) on the performance of digital fiber optical communication systems are based on the assumption of linearity. This paper examines the effect of ISI on error rates in the other limit of complete coherence where fields are additive but powers are not. It is found that in this nonlinear regime and for weak dispersion, ISI may reduce the error rates slightly, whereas strong dispersion augments it considerably. 相似文献
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The Transmission Performance of Non-zero Dispersion Shifted Fiber Communication Systems Using In-line Phase-sensitive Amplifiers 总被引:2,自引:0,他引:2
1 IntroductionHigh speedlong distance (non regenerative)transmissionisthemaingoalofopticalfibercommu nications.Thefactorslimitingtransmissionspeedanddistancearefiberloss,Group velocityDisper sion (GVD )andfibernonlinearity .IthasbeenshownthatErbium dopedFiber… 相似文献
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为了提高光纤应力传感器的抗干扰能力,提出了一种基于保偏光纤的光纤应力传感器设计方案.该方案主要利用保偏光纤的高双折射机理,通过光偏振度的变化来反映外界应力的变化.还给出提高系统性能的一些措施.实验表明,该系统能准确检测出光纤弯曲程度的变化. 相似文献
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Theoretical analysis of system limitation for AM-DD/NRZ opticaltransmission systems using in-line phase-sensitive amplifiers 总被引:1,自引:0,他引:1
This paper shows the theoretically derived performance of single channel, amplitude modulation/direct detection optical transmission systems using in-line optical phase-sensitive amplifiers (PSA's). The calculations take into account the degradation of the signal-to-noise power ratio (SNR) and intersymbol interference (ISI) due to the distortion of transmitted signal pulses. The SNR is analyzed by considering not only amplifier noise and fiber loss but also noise enhancement by four-wave mixing in the transmission fiber. The ISI is estimated by eye-pattern degradation of the transmitted signal numerically calculated using the nonlinear Schrodinger equation. The regenerative repeater spacing of in-line PSA systems limited by SNR and ISI can be expanded by approximately 3 to 10 times that of in-line EDFA systems, in the case of |D|⩽0.1 ps/mn/km dispersion fiber systems transmitting a 40-Gb/s signal 相似文献
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David Poe Sanghyun Woo Hyoungsoo Kim 《Analog Integrated Circuits and Signal Processing》2013,75(3):483-490
Consumer electronics are experiencing an explosive growth in bandwidth requirements. This growth is driven by demand for fiber-to-the-home Internet connections, the increasing capabilities of in-home consumer devices as well as the demands of multimedia recording and playback in mobile devices. However, traditional copper channels and previous generations of optical fiber experience dispersive effects at data rates above 1 Gbps, leading to inter-symbol interference (ISI). This paper presents a finite impulse response filter-based feed forward equalizer (FFE) to reduce the effect of ISI on these channels. The efficacy is of the FFE is demonstrated by measuring the eye diagrams of a 10 Gbps signal transmitted through an optical fiber as well as a copper backplane with and without FFE compensation. The proposed FFEs successfully compensate ISI for both the optical and copper backplane links. All circuits are fabricated using a 0.18 μm CMOS process. 相似文献