ID 原文 译文
53337 本文以带通数字调制技术为研究对象，提出一种具有高能量集中度的新型数字带通调制方法—二分之一连续相位切普键控（1/2-Continous phase Chirp Keying，1/2-CPCK）。 In this paper, a new band-pass digital modulation technologies-1/2Continous phase Chirp Keying (1/2-CPCK), whose energy is highly concentrated, are analyzed.
53338 1/2-CPCK 利用分段式切普信号作为已调信号的波形样本，利用已调信号波形样本间频率的平滑过渡特征，实现高频带利用率的数字通信。 The segmented Chirp signals serve as the waveform samples of modulated signals, which make use of the features that frequency between modulated signals transmits smoothly to improve bandwidth efficiency.
53339 本文构建了 1/2-CPCK 及已调信号功率密度谱的数学模型，分析了已调信号的能量集中度特征，仿真分析了 1/2-CPCK 数字通信系统的误码率特征。 The paper introduces the mathematical models of 1/2-CPCK and its power spectral density, the energy concentration of modulated signals is analyzed. The BER of the 1/2-CPCK digital communication system is analyzed by simulation.
53340 理论分析和仿真结果表明：1/2-CPCK 已调信号具有较高的能量集中度，1/2-CPCK 系统具有较高的频带利用率和较强的高斯白噪声适应能力。 Theoretical analysis and simulation results show that the energy and bandwidth efficiency of 1/2-CPCK are high, 1/2-CPCK digital communication system has better adaptation to additive white Gaussian noise channel.
53341 本文针对 MIMO 系统的空时码识别问题，研究正交空时分组码（OSTBC）信号的高阶统计量特性。 In the light of the problem of blind recognition for space-time coding scheme used in multiple-input-multiple-output (MIMO) communication systems, the higher-order statistics properties of orthogonal space-time block coding (OSTBC) signals are studied.
53342 利用OSTBC 信号的正交特性，推导给出了 OSTBC 信号的二阶矩 m20 (0) 和 m21 (0) 、四阶矩 m40x (0，0，0) 和 m42x (0，0，0) 、四阶累积量 C40 x (0，0，0) 和 C42x (0，0，0) 。 Utilizing the orthogonal properties of OSTBC signals, the second-order moments, fourth-order moments and fourth-order cumulants of the OSTBC signal are derived.
53343 由于四阶累积量抑制噪声能力强，提出了基于四阶累积量的 OSTBC 信号的两个特征参数。 As the fourth-order cumulant with a strong ability to suppress noise, two characteristic parameters of OSTBC signals based on fourth-order cumulant are proposed.
53344 对两种编码方案的仿真结果表明，当信噪比大于 0dB 时，两个特征参数的估计值基本等于理论值;对不同编码方案， Simulation results of two coding schemes show that the estimations of these two characteristic parameters are equal to theory values at 0 SNR ,
53345 这两个特征参数区分度高，因此这两个特征参数可用于 OSTBC 编码方案的信号识别。 and there is a very distinct between the two coding schemes. Therefore, the two characteristic parameters can be used to identify OSTBC signals.
53346 本文主要研究了欠定盲源分离中源信号的空间分布对系统可辨识性的影响。 This paper mainly studies the effect of source location on identifiability of underdetermined blind source separation.