搜索资源列表
rfid_model
- A system simulation environment in Matlab/Simulink of RFID is constructed in this paper. Special attention is emphasized on the analog/RF circuit.Negative effects are concerned in the system model,such as phase noise of the local oscillator,TX-RX
IEEE 802.15.4g
- IEEE 802.15.4g ABSTRACT OF THE THESIS Implementing physical layer (PHY) of IEEE 802.15.4g standard with Direct Sequence Spread Spectrum (DSSS) using Offset Quadrature Phase Shift Keying (O-QPSK)
COSTAS
- 根据韦瓦[ Weawa] 单边带调制解调法、COSTAS 锁相环及双线性变换, 提出基于软件无线电的单边带锁相解调器。解调器运行在TMS320C6203 上, 能实时处理160kHz 信号, 捕捉8kHz 频偏。-According to韦瓦[Weawa] SSB modulation and demodulation method, COSTAS PLL and the bilinear transform, based on software radio single sideband ph
B07_Ivanovs
- Continuous Phase Modulation (CPM) advantage compare with OQPSK (Offset Quadrant Phase Shift Key)
Blind-frequency-offset
- This is a file for Blind frequency offset estimation for overlap PCC-OFDM systems in presence of phase noise
grdx
- 本文提出了数字与模拟 相结合的自适应对消方案。通过对发射天线耦合过来的参考信号进行采样，转 换为数字信号后输入信号处理器中经调幅调相处理，再经过DAC转换并放大 后和接收机接收干扰信号相抵消，抵消残留信号再采样转换为数字信号后输入 到信号处理器中调整调幅调相的权值，重复上述过程，形成模拟和数字相结合 的自适应干扰抵消，最终使干扰噪声得到了衰减。 -This paper presents a combination of digital and analog adaptiv
Offset-Qpsk-Vs-Qpsk
- difference between quadrature phase shift keying and offset quadrature phase shift keying
On-the-Design-of-Frequency-Domain-Equalizers-for-
- This paper considers frequency-domain receiver design for OQPSK signals (Offset Quaternary Phase Shift Keying). It is shown that conventional QPSK receivers are not suitable to OQPSK schemes since they lead to significant interference between
On-the-Design-of-Linear-Receivers-for-SC-FDE-Sche
- This paper considers the design of linear frequency-domain receivers with oversampling for OQPSK (Offset Quaternary Phase Shift Keying) signals. Based on a receiver structure able to eliminate the residual interference between in-phase (I) an
On-the-Design-of-Iterative-FDE-Receivers-for-OQAM
- This paper considers receiver designs for SC-FDE schemes (Single-Carrier with Frequency-Domain Equalization) employing M-ary OQAM signals (Offset Quadrature Amplitude Modulation). It is shown that the interference between the in-phase (I) and
OFDM-FPGA
- 频率同步是宽带OFDM系统中的关键技术，IEEE 802.11a 采用OFDM技术，利用其前导序列的重复结构，提出了一种分步的粗细频偏捕获与校正算法，同时为了补偿时域同步后的残余相差和适应信道的时变特性，还提出了一种基于频域导频的相位跟踪方案-Frequency synchronization is a key technology in the broadband OFDM systems, IEEE 802.11a uses OFDM technology, the use of the r
Phase-and-Frequency-Detector
- 针对锁频锁相器( Phase and Frequency Detector, PFD) 应用于低信噪比、大频偏的条件, 通过理论分析和仿真验证阐述了窗口类型对系统频偏捕获速度、范围、噪声门限及相位噪声抖动的影响机理. 推导出等效相位噪声功率谱密度的表达式. 证明了大窗口具有更低的噪声门限和更小的稳态相位抖动, 但捕获速度较慢. 为了提高捕获速度, 对鉴相器输出值取极性运算得到改进的PFD 算法. 新算法不仅能增加鉴相增益提高捕获速度 还可以减少等效噪声功率谱密度降低相位抖动 同时新算法不需要乘法
compensation-of-dead-time
- 交流伺服系统中的死区效应分析与补偿分析了逆变器的死区效应产生的原因及其对交流伺服系统控制性能产生的影响,指出死区补偿的关键 在于电流相位的获取,为了克服实际系统中电流零点的模糊性,提出了一种基于两相静止坐标系下的前馈死 区补偿方法. 该方法通过对三相输出电流一个周期内补偿电压进行傅里叶变换,发现仅需补偿1 ,5 ,7 次谐波 分量即可消除死区效应. 仿真和试验结果验证了这种方法的正确性和可行性.-AC servo system analysis and compensation of
1
- 超紧耦合是 GPS/INS 组合导航系统的最新研究方向，它采用 INS 测得的载体动态信息辅助 GPS 接收机跟踪环 路，消除卫星信号中由于载体与卫星之间相对运动所产生的频率偏移，提高接收机在高动态环境下载波跟踪性能，同时还 可以压缩带宽，有效增强接收机抗干扰性能。介绍 GPS/INS 超紧耦合技术，给出 INS 辅助 GPS 载波跟踪环路结构图和相应 的数学模型，分析 INS 辅助 GPS 跟踪环路在动态环境下的动态残留及其对环路相位误差的影响，并进行了模型仿真，最后 对仿真结
analisa
- This model shows the implementation of a QPSK transmitter and receiver. The receiver addresses practical issues in wireless communications, e.g. carrier frequency and phase offset, timing offset and frame synchronization. The receiver demodulates the
Antenna-phase-
- 天线相位中心偏差变化及改正模型对精密单点定位精度的影响-Antenna phase center offset correction model changes and precise point positioning accuracy of
PSKmodulation
- 提出一种全新的子载波调制方式盲识别算法,该算法利用ＯＦＤＭ子载波组的统计特性,然后通过推导得到新的基于混合高阶矩的特征量,使得到新的特征量不受信噪比、载波频偏与相位偏移的影响。 -Proposed a new sub-carrier modulation count Blind Identification Method, the method using the statistical characteristics of the OFDM sub-carrier group, an
evm
- 针对ＴＤ－ＬＴＥ ＰＲＡＣＨ信道信号ＥＶＭ测量实现复杂、实时性差、测量精度不高的问题，提出一种基于随机接入信号相关性、频偏估计、相位估计以及硬件相偏校准的ＥＶＭ求解算法，可以快速准确地进行ＥＶＭ测量。通过对比和仿真，验证了该实现方案的高效性和可行性。该算法已在ＴＤ－ＬＴＥ射频一致性测试仪表中得到应用-Implementation for TD-LTE PRACH channel signal EVM measurement of complex, real-time differential m
LTE
- 对于城市环境中的高精度单频 GNSS 接收机而言，若考虑误差预报处理已抵消电离层误差，则地面传播环境所导致的多径效应将成为系统误差的主要因素。基于现有蜂窝通信的高分辨率信道估计结果，针对电波传播的幅度、相位、多普勒等特征提取信道响应函数，在极小误差范围内提供至 L 波段信号的线性特征映射-For multipath effects in urban environments with high accuracy single-frequency GNSS receiver, the foreca
Offset-CS-Algorithm-in-LTE
- ：LTE(Long Term Evolution，长期演进)系统中的小区初始搜索过程通过分别检测主同步信号(Primary Synchronization Signal，PSS)和辅同步信号(Secondary Synchronization Signal，SSS)来完成，搜 索结果包括小区组ID、符号定时、频偏估计、组内小区ID以及帧定时[1]。然而，若接收信号 1IDN 2IDN 中存在整数倍频偏，则由于时域的相位旋转，主