ID 原文 译文
45086 现有相关工作主要集中在加性高斯白噪声（AWGN）信道，而多径场景下的盲识别尚未得到充分研究。 The existing works mainly focus on additive white Gaussian noise (AWGN) channel, while the blind identification in multi-path scenarios has not been sufficiently investigated.
45087 考虑未知多径衰落信道下的盲低密度奇偶校验码（LDPC）识别，提出了基于期望最大化（EM）算法的似然分类器，以获得未知参数的最大似然估计值， Considering the blind low density parity-check (LDPC) codes identification in the presence of unknown multi-path fading channel, a likelihood-based classifier was proposed using the expectation maximization (EM) algorithm to obtain the maximum likelihood estimates of the unknown parameters.
45088 并采用平均对数似然比（LLR）估计器对未知编码器进行识别。 Then, an average log-likelihood ratio (LLR) estimator was adopted to classify the unknown encoder.
45089 数值结果表明，该算法在多径信道中具有良好的识别性能，特别是在低信噪比区域。 Numerical results show that the proposed algorithm provides promising identification performance in multi-path channels,especially in the low signal-to-noise ratio region.
45090 针对 Nakagami-m 衰落信道中，D2D（device to device）通信频谱利用率低的问题，设计一种基于非数据辅助误差矢量幅度（NDA-EVM, non data-aided error vector magnitude）的自适应调制算法。 A novel adaptive modulation based on non data-aided error vector magnitude (NDA-EVM) was proposed to solve the problem of lower spectral efficiency in device to device (D2D) communication over Nakagami-m fading channel.
45091 以 NDA-EVM 作为信道质量评估参量， The NDA-EVM was used to evaluate the channel quality.
45092 根据最大似然准则建立 NDA-EVM 与误码率（SER, symbol error ratio）的定量关系， The relationship between NDA-EVM and symbol error ratio (SER) was derived according to the maximum likelihood method.
45093 据此设计SER 约束下的 MQAM 调制方式切换机制； Thereafter, the adaptive modulation mechanism of MQAM with the SER constraint was designed.
45094 结合有限状态马尔可夫信道模型以及数据缓存处理，分析系统的分组丢失性能和频谱利用率。 Considering the joint effect of finite-length queuing and fading channel,the system packet loss rate and spectral efficiency was analyzed.
45095 理论分析和仿真实验表明，基于 NDA-EVM 的自适应调制算法在不同调制方式的阈值下的准确性，明确系统 QoS 与分组丢失率的关系；在保持低算法复杂度的同时，提高了系统频谱利用率，对比传统算法，频谱利用率提升了 0.752 bit·(s·Hz) −1 。 Theoretical analysis and simulation experiments show that NDA-EVM based adaptive modulation accurately gives the modulation threshold and evaluates the relationship be-tween QoS and packet loss rate, the proposed algorithm improves system spectral efficiency while maintaining low algorithm complexity, spectral efficiency improves by 0.752 bit·(s·Hz) −1 , compared with traditional algorithm.