ID 原文 译文
48416 差分正交相位偏移键控(differential QPSK,DQPSK)可以克服相位模糊,但是会导致约2.3dB的性能损失。 The differential quadrature phase shift keying (QPSK, differential DQPSK) can overcome the phase ambiguity, but can lead to performance loss about 2.3 dB.
48417 为了消除DQPSK的性能损失,提出一种低复杂度的基于迭代译码的联合卷积DQPSK编码调制方法,并且基于外信息转移图,提出了一种在DQPSK调制下优化卷积码生成多项式的算法。 In order to eliminate the performance loss of the DQPSK, a low complexity of joint convolution DQPSK code modulation method based on iterative decoding, and based on the information transfer diagram, put forward a DQPSK modulated under optimal convolution code generating polynomial algorithm.
48418 仿真结果表明,所提差分编码方案不仅可以克服相位模糊,而且通过迭代译码完全补偿了差分编码所导致的差分代价损失,甚至获得了3.5dB的性能增益。 The simulation results show that the proposed differential coding scheme can not only overcome the phase ambiguity, and through the iterative decoding completely compensated the differential coding cost loss caused by the difference, even won the performance gain of 3.5 dB.
48419 优化后的卷积码与IEEE 802.11n协议中给定的卷积码相比,获得了大约0.3dB的信噪比增益,和第3代合作伙伴计划(3rd generation partnership project,3GPP)长期演进(long term evolution,LTE)协议中的Turbo码相比,有大约1.1dB的性能增益。 Optimized convolution code and the convolution code given in the IEEE 802.11 n agreement compared to obtain the signal to noise ratio of about 0.3 dB gain, and the third generation partnership project (3 rd generation partnership project, 3 GPP) long term evolution (long term evolution, LTE) compared the Turbo codes of the agreement, the performance gain of about 1.1 dB.
48420 当信噪比(signal-to-noise ratio,SNR)较低时基于数据处理的多径估计算法的估计性能显著降低。 When the SNR (signal - to - noise thewire, SNR) is low estimates based on data processing of multipath estimation algorithm performance is significantly reduced.
48421 提出了基于Kalman滤波和Teager-Kaiser(TK)算子/最小二乘(least square,LS)相结合的多径估计算法,简称KTK/KLS算法。 Is proposed based on Kalman filter and Teager - Kaiser (TK) operator/least-squares (further square, LS) combined with multipath estimation algorithm, referred to as KTK/KLS algorithm.
48422 该算法通过Kalman滤波消除低SNR的高斯噪声对相关输出的影响,然后将滤波后的相关输出用于TK算子/LS估计直接信号时间延迟或多径参数。 The algorithm by gaussian noise of Kalman filter to eliminate the low SNR of the output, then after the filtering of relevant output for TK operator/LS estimate signal time delay or multipath parameters directly.
48423 KTK/KLS算法有效解决了仅使用TK算子和LS算法进行参数估计时对噪声比较敏感的问题,保留了二者对多径比较敏感的优点。 KTK/KLS algorithm effectively solves the only use TK operator and the LS algorithm parameter estimation problem of is more sensitive to noise, and retained the advantages of multipath is sensitive.
48424 最后,通过仿真将KTK/KLS算法与其他高效的基于数据处理的多径估计算法进行比较,结果表明所提出算法的多径估计精度优于对比算法。 Finally, the simulation will KTK/KLS algorithm with other efficient multipath estimation algorithm based on data processing are compared, the results show that the proposed algorithm of multipath estimation precision is better than comparison algorithm..
48425 运用结合了扩展手段的非线性对比源反演算法解决二维弹性波矢量情况的成像问题,其中采用的扩展手段为正则化方法和并行频率方法。 By means of combining extension of non-linear contrast source inversion algorithm solving the problem of two-dimensional elastic wave vector of imaging, which USES the extension method for the regularization method and parallel frequency method.