共查询到18条相似文献,搜索用时 156 毫秒
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针对高速互连系统中传输线上的串扰问题,基于电磁耦合理论,研究了耦合传输线信道传输矩阵的性质,建立了以下两种情况的耦合传输线信道传输矩阵模型及其矩阵分解形式,分别是:(1)考虑受扰线两边各一条相邻微带线对受扰线的串扰;(2)考虑受扰线两边各两条相邻微带线对受扰线的串扰.给出了上述两种情况下基于耦合传输线信道传输矩阵分解形式的串扰抵消方案,并利用仿真工具ADS对其进行了验证.结果表明:信号抖动和失真大幅下降,串扰抵消效果良好,并且第二种情况下的串扰抵消效果优于第一种情况.该结果说明了在基于耦合传输线信道传输矩阵进行串扰抵消时,考虑两边各两条相邻微带线的串扰效果较好,对保持高速信号完整性具有一定的实际应用价值. 相似文献
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非平行微带线是印刷电路板(PCB)上不可避免的互连结构。针对PCB 上非平行微带线间的串扰问题,用平行微带线近似非平行微带线,把平行耦合微带线间的串扰抵消方法应用到非平行耦合微带线中,提出了利用耦合传输线信道传输矩阵方法来进行远端串扰抵消,在对非平行耦合传输线信道传输矩阵进行特征值分解的基础上构建串扰抵消电路。仿真了非平行微带线间夹角分别为q=3°、5°、10°时的串扰,结果表明,该方法可以有效改善非平行微带线上信号眼图的质量,串扰抵消效果良好。 相似文献
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AWG作光路分插复用器串扰对信道数的影响 总被引:1,自引:1,他引:0
研究了阵列波导路由器作光路分插复用器(OADM)串扰的影响,其路由器含有m个上路/下路信道和n个传输信道。理论分析表明:随着上路/下路信道m和传输信道n的增加,串扰使OADM的信噪比QCT,成非线性下降、由于在阵列波导路由器中存在串扰,限制了基于 OADM的网络复用信道数。 相似文献
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针对多核环境中高速无线信号的加扰、解扰,提出了一种基于稀疏矩阵的多核并行扰码方法。首先对输入信号进行串/并转换,并将各路信号分别送入对应的处理器核;考虑基于稀疏矩阵的并行扰码生成器,在单个处理器核内,将其生成的伪随机码与输入信号进行模二加运算,得到单路信号的扰码输出;最后将多路并行的扰码输出变换为串行输出。运算量分析结果表明,采用IEEE 802.11n中的扰码生成多项式,与普通矩阵乘法实现的多核并行扰码方法相比,基于稀疏矩阵的多核并行扰码方法,其运算量降低了一个数量级。 相似文献
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详细分析了扩展的Benes(DB)型光交换结构串扰特性,重点研究了一种改进扩展Benes结构(MDB)。从DB型光交换结构出发,提出了传输矩阵和结构矩阵的概念。通过本算法,选择合适光交换网络路由方式实现消除带内串扰。通过本算法可以完全消除MDB带内串扰,同时也可以大大降低一般DB光交换结构的带内串扰。 相似文献
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A Near-Optimal Linear Crosstalk Canceler for Upstream VDSL 总被引:2,自引:0,他引:2
《Signal Processing, IEEE Transactions on》2006,54(8):3136-3146
Crosstalk is the major source of performance degradation in VDSL. Several crosstalk cancelers have been proposed to address this. Unfortunately, they suffer from error propagation, high complexity, and long latency. This paper presents a simple, linear zero-forcing (ZF) crosstalk canceler. This design has a low complexity and no latency and does not suffer from error propagation. Furthermore, due to the well-conditioned structure of the VDSL channel matrix, the ZF design causes negligible noise enhancement. A lower bound on the performance of the linear ZF canceler is derived. This allows performance to be predicted without explicit knowledge of the crosstalk channels, which simplifies service provisioning considerably. This bound shows that the linear ZF canceler operates close to the single-user bound. Therefore, the linear ZF canceler is a low-complexity, low-latency design with predictable near-optimal performance. The combination of spectral optimization and crosstalk cancellation is also considered. Spectra optimization in a multiaccess channel generally involves a complex optimization problem. Since the linear ZF canceler decouples transmission on each line, the spectrum on each modem can be optimized independently, leading to a significant reduction in complexity. 相似文献
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Hirai J. Tae-Woong Kim Kawamura A. 《Industrial Electronics, IEEE Transactions on》1999,46(6):1174-1182
In previous papers, the authors introduced the wireless transmission of power and information (WTPI). This paper describes the most important issue for realizing the WTPI, which is how to ensure reliable transmission by reducing the crosstalk from the power-to-data channel. Crosstalk analysis is made with the following steps after the review of the WTPI technology: (1) magnetic flux distribution in the coaxial WTPI coupling is assumed; (2) an equivalent circuit is drawn by introduction of the crosstalk coefficient Kct; and (3) according to the equivalent circuit, the crosstalk ratio CR is calculated and the induced noise level is estimated. Thereafter, the following three possible countermeasures to reduce crosstalk are proposed: (1) appropriate magnetic core dimensioning for the coupling; (2) reduction of high-frequency harmonics in the power inverter output voltage; and (3) magnetic shielding. Lastly, test results on concurrent transmission with the combination of these countermeasures are shown 相似文献
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文中给出了一种利用矩阵结构进行多点测温的方法,它能充分利用计算硬件资源,降低系统成本,扩展了单片机在大面积多点测量领域里的应用,系统设计有效了克服通迅中信号的碰撞问题和传输错误,具有可靠性高,抗干扰性能等优点。 相似文献
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串音是影响VDSL2传输速率的主要因素.针对上行传输中的串音干扰,利用矩阵分裂技巧和迭代原理,提出了一类低复杂度,高效的迭代串音抑制算法.同时根据串音信道传输矩阵的对角占优和列对角占优特性,重点研究了对角分裂迭代算法和上三角分裂迭代算法.根据上行传输的信道传输矩阵特点可以推断,基于上三角分裂的迭代算法性能最优.新算法通过逐次迭代使得性能逼近置零算法,而优于一阶逼近算法,且其一步迭代的运算量与一阶逼近算法相当.基于实测数据的计算机仿真结果验证了新算法的有效性. 相似文献
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A new method for the reduction of crosstalk and echo in multiconductor interconnections 总被引:1,自引:0,他引:1
Broyde F. Clavelier E. 《IEEE transactions on circuits and systems. I, Regular papers》2005,52(2):405-416
Crosstalk and echo can be reduced in multiconductor interconnections, using (truly) matched terminations and a different modal variable for each transmission channel. We first study a conventional technique for reducing reflections, using grounded linear two-terminal circuit elements. Using the concepts of modal voltages and modal currents, we define a new method for the reduction of crosstalk and echo, which involves specific terminations, specific transmitting circuits to send signals, and specific receiving circuits to receive signals. We establish the design equations and show that the new method is related to a particular choice of eigenvectors, called associated eigenvectors. Simulations of two examples of implementation of this method confirm that it provides reduced crosstalk and echo. We also discuss the implementation of the new method with an interconnection having identical propagation constants for all modes. Finally, we compare the new method with a different concept based on modal variables and unspecified terminations. 相似文献
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多用户MIMO-OFDM信道的色散效果可以看成是一组由频点(FB)观测值组成的瞬时混叠结构。如果一个新的用户加入时,意味着引入新的干扰,信道矩阵结构被扩大。由于扩大的矩阵含有已知和未知2部分信息,由此需要设计一个针对2部分信息的盲结构。选择盲分离方法,利用信号间存在的相关性,推导出新用户的混叠结构参数矩阵,然后在每个FB上分离出不同用户的信号,由于利用了已知信道的信息,盲分离后产生的不确定性被纠正。计算机仿真验证了所提出算法的有效性。 相似文献