ID 原文 译文
53267 以低信噪比窄带干扰条件下混沌 DSSS 系统信息传输的可靠性提高为目的，在混沌 DSSS 系统的基础上，结合 QC-LDPC 码提出了一种基于 QC-LDPC-CDSSS 的协同窄带干扰（Narrowband Jamming，NBJ）抑制方案。 In order to improve the bit-error-rate (BER) at the low SNR, a novel cooperative anti-jamming scheme for narrow-band jamming suppression is proposed based on the QC-LDPC codes and integrated Map chaotic direct sequence spread spectrum.
53268 该方案在直积构造方法生成校验矩阵的过程中，完成了校验矩阵 4、6 短环的检验与消除，采用近似下三角算法实现了QC-LDPC 编码; The QC-LDPC codes are designed through approximate lower triangular form algorithm based on the parity check matrix. The direct product is used for constructing the parity check matrix.
53269 对于混沌直序扩频系统，分析了组合混沌映射序列的性能和优选方法，采用优选的组合混沌扩频序列增强低截获能力; The performance of chaotic spread spectrum sequences, produced from the integrated Chaotic MAP, is analyzed and their optimized selection algorithm is proposed.
53270 最后通过不同干扰条件下的仿真验证了该方案的有效性，仿真结果表明，该方案对于单音干扰的抑制效果优于多音干扰的抑制效果，在 10-5 的误码要求条件下，信噪比小于 4dB。 Finally, the strategy is verified through simulations with different jamming. The results show that the scheme performs better with single tone jamming than multi-tone jamming and the SNR is smaller than 4dB when the BER is 10-5.
53271 针对常规最小二乘宽带波束形成中存在波束响应不满足频率不变特性和干扰方向零陷无法控制的问题，提出了一种基于空间响应偏差约束的最小二乘宽带波束形成方法。 Currently conventional least squares broadband beamforming do not well for the frequency invariant characteristic and null control. A least squares broadband beamforming based on the spatial response variation constraints (SRV) has been proposed in the literature.
53272 该方法通过对阵列空间响应在指定的宽频段和方位范围内施加约束，来控制阵列波束响应的频率不变特性，同时增加一系列的线性约束，可以实现旁瓣电平和干扰零陷的灵活控制。 The array spatial response constraints are added to the prescribed wide frequency and angle range, which can achieve the frequency invariant beamforming. At the same time, a series of linear constraints are used for the sidelobe and null control.
53273 在全方位约束和仅主瓣方位约束两种情况下，均能有效改善宽带波束的频率不变性能，并能在干扰方向上准确形成深零陷。 Whether the SRV constraint on the whole angle range or mainlobe area angle range, the method can improve the frequency invariant property and achieve deep null control in the direction of the interference accurately, compared the conventional least squares broadband beamforming.
53274 仿真实验结果验证了该方法的有效性。 Simulation results are given to validate the effectively of the algorithms.
53275 设计了一种用于 2.4GHz RFID 单芯片阅读器的 CMOS 低噪声放大器（LNA）。 A 2.4 GHz CMOS low noise amplifier (LNA) is presented for the use of single-chip RFID reader.
53276 该设计采用全差分共源共栅结构和新颖的多级噪声抵消技术，不仅减小了电路的噪声而且增加了系统的线性度。 The design uses a fully differential cascode structure and a novel multi-stages noise cancellation technology, not only reducing noise but alsoincreasing linearity of the system.