Description: 本论文从TH-UWB的信号结构特点出发，分析了TH-UWB系统多址干扰与
CDMA系统多址干扰的不同特点，提出了多个低复杂度的多用户检测器。-In this paper, from the TH-UWB signal structure characteristics of an analysis of TH-UWB system with multiple access interference
CDMA systems multiple access interference of the different characteristics of a number of low-complexity multi-user detector. Platform: |
Size: 1096704 |
Author:连自锋 |
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Description: UWB脉冲设计与窄带干扰抑制
为了避免对频带内已有的窄带通信系统造成干扰，在进行波形设计时，如果能使UWB脉冲在干扰频带内的能量下降，即在窄带通信系统的工作频带内实现陷波，则可达到抑制窄带干扰的目的。-UWB pulse design and narrow-band interference suppression in order to avoid the narrow band communication systems has been caused by interference, in waveform design, if the UWB pulse can interfere with the band in the energy decline, that is, in the narrow-band communications system to achieve Notch can be inhibited to achieve the purpose of narrow-band interference. Platform: |
Size: 51200 |
Author:刘卫菠 |
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Description: 分析了在超宽带通信系统中的扩频干扰，并用两种通用的调制技术实现了对提出的抗干扰方法的仿真-he ultra wideband (UWB) interference to direct
sequence spread spectrum (DSSS) receiver is analyzed. Two
popular UWB modulation schemes, the time hopping pulse
position modulation (TH-PPM) and time hopping pulse
amplitude modulation (TH-PAM), are considered. The pulse
repetition rate (T’RR) of UWB signal and the freqnency hand of
the DSSS play the primary roles in the BER performance of the
DSSS receiver in the presence of UWB interference. The UWB
signal parameters raising the interference to DSSS receiver are
discussed. The characteristics of an aggregation of multiple
UWB signals are somehow different from that of a single UWB
device, especially for the TB-PPM scheme, where discrete
spectral lines maybe exist in the band of DSSS receiver. The
system parameters of TH-PPM such as the modulaiion index
and maximum shift incurred hy the time hopping code
determine the amplitude of the discret Platform: |
Size: 283648 |
Author:张洋 |
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Description: 在多用户干扰情况下，仿真IR-UWB系统的性能。-In the case of multi-user interference, simulation IR-UWB system performance. Platform: |
Size: 3072 |
Author:张巧玲 |
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Description: ：近距离目标超高分辨率微波成像技术在安全检测、非破坏性控制、生物医学等领域中有着非常重要的应用
价值和广阔的应用前景。该文利用基于窄脉冲形式的超宽带时域雷达系统研究近距离目标的高分辨率ISAR成像，
给出了仿真和实测结果。利用转台旋转目标，基于超宽带脉冲源和超宽带收发天线以及高性能取样示波器，配以同
步触发脉冲和自行研发的数据采集软件，搭建了该时域雷达实验系统，提出了准确获取目标回波信息的实验条件，
和实现回波延时精确校正的误差补偿方法。并针对采样时间窗内的杂波干扰，讨论了时域后向投影算法(Back
Projection，BP)与背景对消技术相结合的成像算法，实现了分辨率为 8 mm 的近距离目标的成像，准确地反映了
目标的位置、形状和大小等信息。- The high resolution imaging of near field targets are interesting for security, non-destructive control and
biomedical application. In this paper, high resolution near field ISAR imaging is implemented using Ultra Wide
Band (UWB) time domain radar system. Simulation and experiment are both conducted. The target is rotated by
turntable. The system is built based on the UWB pulse source, UWB antennas, high performance sampling
oscillograph, synchronous trigger pulse and proper motion study data acquisition software. Experiment condition
and delay errors compensation method are presented to obtain accurate echo information of the target. And Back
Projection (BP) combined with background cancel algorithm is discussed considering the clutter interference in
time window. Platform: |
Size: 1698816 |
Author:chinaafxp |
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Description: Review of current short/medium range wireless
standards and expected challenges for future systems
• Introduction to Ultra-wideband (UWB) Technology
– What is it?
– Possible benefits and challenges
• Performance example of M-PAM and DS-SS UWB
systems with various RAKE receiver structures
• Can UWB coexist with other systems?
– Review of FCC regulatory process and interference studies
– Other considerations
-Review of current short/medium range wireless
standards and expected challenges for future systems
• Introduction to Ultra-wideband (UWB) Technology
– What is it?
– Possible benefits and challenges
• Performance example of M-PAM and DS-SS UWB
systems with various RAKE receiver structures
• Can UWB coexist with other systems?
– Review of FCC regulatory process and interference studies
– Other considerations
Platform: |
Size: 256000 |
Author:anna |
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Description: Ultra Wide Band (UWB) is a technology for the transmission of data using techniques which cause a spreading of the radio energy over a very wide frequency band, with a very low power spectral density. The low power spectral density limits the interference potential with conventional radio systems, and the high bandwidth can allow very high data throughput for communications devices, or high precision for location and imaging devices. Platform: |
Size: 39936 |
Author:mimansa |
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