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    The transmission efficiency of digital co mmunication links with high bit error rates and high slip rates was enhanced by the Maximum A Posteriori-based frame synchronization algorithm.
    针对高误码率、高滑码率的恶劣无线数字传输链路,为了提高帧同步判决的可靠度并从而提高系统传输效率,该文提出了一种基于最大后验概率(MAP)的定长帧同步判决算法。
    The bit error rates of system decrease similar to conic drop or part of it similar to conic drop, imitate separately with the conic of different coefficient, can control difference in 0.005 ̄0.02 ranges.
    系统误码率随信噪比增加以近似二次曲线下降或部分近似二次曲线下降,以不同系数的二次曲线分别进行模拟,可以控制差值在0.005 ̄0.02范围内。
    Experimental results shows: a data rates of 600bits/s with the bit error rates on the order of 10"4 was demonstrated at distance 6000m in the shallow water channel of Xiamen harbor.The innovation of this dissertation is that:
    该系统经过了实验室水池以及厦门港海上的现场实验。 实验结果表明:在水平传输距离为6000米,数据传输速率为600bits/s时,系统的误码率约为104左右,证明了该系统具有较强的抗多途干扰能力。
    wireless links have constraints on higher bit error rates (BER) and lower transmission bandwidth.
    无线接入网络存在高误码率和低带宽等限制。
    One is in wireless Internet in which the wireless link lies in the last hop of communication path. In this environment an integrated scheme is presented to solve the problem about higher bit error rates and disconnection. Then cross-layer problem occurring in the scheme is analyzed in detail and simulated.
    文中主要讨论了两种不同网络结构中的无线TCP协议改进方案,其一在最后一跳为无线链路的网络环境中,针对基本TCP拥塞控制机制存在的缺陷,文中在现有解决方案的基础上提出一综合性的方案,其中包括无线链路的高误码率和连接断开问题的解决,并重点对方案中出现的交叉层问题进行分析和仿真;
    However, compare with the wired environment, the characters of wireless networks are high bit error rates, low bandwidth, long time delay, frequency moving and so on, so there are high error rate in wireless network.
    但是,无线网络通常具有误码率高、带宽低、时延大和移动频繁等特性,这使得无线链路有相对较高的差错率。
    One is in wireless Internet in which the wireless link lies in the last hop of communication path. In this environment an integrated scheme is presented to solve the problem about higher bit error rates and disconnection. Then cross-layer problem occurring in the scheme is analyzed in detail and simulated.
    文中主要讨论了两种不同网络结构中的无线TCP协议改进方案,其一是在最后一跳为无线链路的网络环境中,针对基本TCP拥塞控制机制存在的缺陷,以现有解决方案为基础提出一综合性的方案,其中解决无线链路的高误码率和连接断开等问题,并重点对方案中出现的交叉层问题进行分析和仿真;
    In Gaussian noise channel and power line channel with adding noises only,thisemulational system calculate out relationship between bit error rates and signal tonoise ratios.
    以只有加性噪声的高斯信道和电力线信道为例,用本仿真系统分别计算出了无差错控制编码和有差错控制编码情况下误码率与信噪比的关系。
    2. Capability of the codec scheme and the simulation system for resisting bit error rates (BER) are studied deeply.
    2.对以上提出的语音编解码方案及由此实现的编解码系统抗误码性能进行了深入研究,结果表明:由该方案所实现的数字语音编解码系统具有良好的抗误码能力,在误码率小于2.5%时,均可实现清晰的语音通信。
    In order to correct this,we will use an improved Gaussian approximation (IGA) to compare these schemes. It is shown by a finer analysis that despite the dynamic range requirements being quite different,the bit error rates of these two schemes in AWGN channel are identical.
    本文采用改进的高斯近似 (IGA)方法进行分析 ,结果表明 :尽管两种传输方案中信号的动态范围要求不一样 ,但在AWGN信道上这两种方案的误码率性能是相同的 .
    This paper describes a 8VSB turbo trellis coded modulation(turbo TCM)scheme for bandwidth efficient channel It combines strong error protection turbo codes with high spectral efficiency trellis coded modulation and is robust to transmit information At the same time,a suitable iterative decoding structure is proposed Its bit error rates curve also is presented
    本文阐述了一种适用于带限信道的8VSBTurbo 格状编码调制方案,它把纠错能力极强的Turbo 码和频带效率极高的格状编码调制相结合,具有极强的信道传输能力。 同时给出了相应的迭代译码算法及其误码率曲线
    Experimental results show that this kind of IS simulation method based on LDT has very high efficiency,accuracy and reliability. Especially,it is adapted to estimating very low Bit Error Rates (BERs) of communication links.
    计算机模拟实验表明 ,这种基于LDT技术的IS方法具有很高的精确度和计算效率以及充分的可靠性 ,特别适合于极低误码率的估计 .
    Based on Euclidean distance(ED), a new method is proposed, which can be used to analyse structure of parallel concatenated trellis coded modulation(TTCM) and computer bit error rates. Maximum free ED is made as a criterion, and the conclusion is drawn that past schemes of constructing TTCM are not the best.
    提出了一种用欧氏距离分析并行级联网格编码调制 (TTCM)的构成及误码率的方法 ,以最大自由欧氏距离 (MFED)为依据 ,分析得到目前已有的几种构成方案并非最佳 TTCM,提出了一种构成最佳 TTCM的方案。
    In this paper, the pulse delay spread profile(PDSP) of digital mobile communication is studied. The relation between PDSP and bit error rates on GMSK modulation is analyzed, and the models of theory and computer simulation for bit error rates performance of GMSK are found out with affectation of four typical kinds of PDSP.
    通过对数字移动信道脉冲响应时延展宽包络 ( PDSP)波形的研究 ,分析了GMSK调制下的脉冲时延展宽包络与误码率之间的变化关系 ,建立了两者之间关系的理论模型和计算机仿真模型 ,同时给出了在四种较为典型的 PDSP作用下 ,GMSK误码率特性的计算机仿真结果。
    Base on Euclidean distance (ED), a new method is used to analysis structure of t urbo trellis coded modulation (TTCM) and to calculate bit error rates in this p aper. Maximum free ED is considered as an important criterion for comparing diff erent schemes of TTCM , from which we may conclude that most existing schemes ar e not the best.
    提出了一种用欧氏距离分析TURBO网格编码调制 (TTCM )的构成及误码率的方法 ,以最大自由欧氏距离 (MFED)为判据 ,分析比较不同构成TTCM的方案 ,得到目前已有方案并非最佳 .
    Simulations show that the average spectrum distortion (ASD) of the proposed scheme is better than that of frame - erasure method at different bit error rates.
    计算机仿真结果表明,在不同误码率下该算法恢复出的语音的平均谱失真(ASD)低于帧删除方法的谱失真最大可达0.4dB.
    Analytical and simulated results show that tail distribution is very different from Gaussian and the effects of passive intermodulation interference on communication systems are mainly in region of low bit error rates.
    分析和模拟结果表明 ,总干扰的尾分布与高斯噪声很不相同 ,无源互调对通信系统的影响主要是在低误码率范围内。
    An error resilience scheme for very low bit rate speech coding was developed for speech communications on narrow band channels with high bit error rates.
    为满足在高误码率的窄带信道上进行语音通信的需求 ,研究了一种适用于甚低速率语音通信的抗误码参数估值算法。
    Objective and subjective simulations show that the performance of the proposed scheme is always better than that of the frame erasure method at all bit error rates.
    仿真结果表明 ,在不同误码率下用该算法恢复出的重建语音 ,不论客观评价或是主观评价 ,其质量都要优于传统的帧删除掩盖方法
    In this paper, we analysis and compare the maximum mutual information (MMI) and bit error rates (BER) of three typical joint equalization methods for block transmission systems implemented by filterbanks in wireless communications.
    本文针对无线信道中三种用滤波器组实现的块传输系统的联合均衡方法,就系统的最大互信息量和误码率性能作了分析比较。
 

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