The impact of multipath propagation on the performance of smart antennas in micro- and pico-cellular CDMA environments

2002 ◽  
Author(s):  
A. Khjenhasiri ◽  
S. Safavi-Naeini ◽  
Y. Wang
Keyword(s):  
Multipath Propagation ◽  
Smart Antennas ◽  
Cellular Cdma ◽  
The Impact

scholarly journals Investigating the Impact of Smart Antennas on SAR

2004 ◽  
Vol 52 (5) ◽  
pp. 1370-1374 ◽  
Author(s):  
K.-C. Chim ◽  
K.C.L. Chan ◽  
R.D. Murch
Keyword(s):  
Smart Antennas ◽  
The Impact

scholarly journals Parametric Underwater Transmission Based on Pattern Time Delay Shift Coding System

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Yue Cheng ◽  
Anbang Zhao ◽  
Juan Hui ◽  
Tiansi An ◽  
Bin Zhou
Keyword(s):  
Time Delay ◽  
Multipath Propagation ◽  
High Rate ◽  
Theoretical Research ◽  
Coding System ◽  
Small Aperture ◽  
Underwater Acoustic ◽  
Sea Trial ◽  
Parametric Array ◽  
The Impact

The technique of pattern time delay shift coding (PDS) underwater acoustic (UWA) communication based on parametric array is presented in this paper, which is easy to be implemented and robust in the spatiotemporal variable ocean environment. The parametric array can generate low-frequency, broadband, and high-directivity beam with small-aperture. The high directivity reduces the impact of time variant characteristics of UWA channel especially multipath effects and improves the reuse rate of underwater acoustic channel at the same time. The wide bandwidth allows high rate communications. The sea trial results show that it can be employed to combat multipath propagation in shallow water and achieve very low bit error rate (BER). The theoretical research and sea trial verify the feasibility and effectiveness of the proposed UWA method.

Navigation Signal Disturbances by Multipath Propagation – Scaled Measurements with a Universal Channel Sounder Architecture

Frequenz ◽  
2015 ◽  
Vol 69 (11-12) ◽  
Author(s):  
Robert Geise ◽  
Bjoern Neubauer ◽  
Georg Zimmer
Keyword(s):  
Multipath Propagation ◽  
Practical Importance ◽  
Navigation Systems ◽  
Channel Sounder ◽  
Simulation Techniques ◽  
Universal Approach ◽  
Navigation Signals ◽  
The Impact ◽  
Large Parameter Space ◽  
Real Scale

AbstractThe performance of navigation systems is always reduced by unwanted multipath propagation. This is especially of practical importance for airborne navigation systems like the instrument landing system (ILS) or the VHF omni directional radio range (VOR). Nevertheless, the quantitative analysis of corresponding, potentially harmful multipath propagation disturbances is very difficult due to the large parameter space. Experimentally difficulties arise due to very expensive, real scale measurement campaigns and numerical simulation techniques still have shortcomings which are briefly discussed. In this contribution a new universal approach is introduced on how to measure very flexibly multipath propagation effects for arbitrary navigation systems using a channel sounder architecture in a scaled measurement environment. Two relevant scenarios of multipath propagation and the impact on navigation signals are presented. The first describes disturbances of the ILS due to large taxiing aircraft. The other example shows the influence of rotating wind turbines on the VOR.

scholarly journals Model of Handover and Traffic Based on Cellular Geometry with Smart Antenna

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Zufan Zhang ◽  
Jie Zhang ◽  
Shaohui Sun
Keyword(s):  
Probability Density Function ◽  
Mobile Communications ◽  
System Performance ◽  
Dwell Time ◽  
Smart Antenna ◽  
Cell Structure ◽  
Smart Antennas ◽  
Traffic System ◽  
Cellular Mobile ◽  
The Impact

Based on the application of smart antennas in cellular mobile communications, this paper introduces the impact of the width of the antenna beams playing on the dwell time probability density function in cellular geometry with smart antenna. The research results indicate that the smart cell structure can improve the dwell time of users within the cell and improve the traffic system performance.

An overview of 60 GHz location systems operating in multipath environments

2011 ◽  
Vol 3 (2) ◽  
pp. 223-230 ◽  
Author(s):  
Michael Bocquet ◽  
Christophe Loyez ◽  
Nathalie Rolland
Keyword(s):  
Signal Processing ◽  
Frequency Band ◽  
Multipath Propagation ◽  
Frequency Hopping ◽  
60 Ghz ◽  
Location Error ◽  
Specific Signal ◽  
System A ◽  
The Impact ◽  
Location Systems

This study deals with a non-exhaustive overview of location systems operating in the 60 GHz frequency band. Both impulse and frequency hopping topologies are considered and the performances of the two realized systems are presented. For each system, a specific signal processing has been implemented to prevent the degradation of the location error from the impact of the multipath propagation.

Simulation Detection Power of Shore-Based Radar under the Influence of Sea Clutter

2014 ◽  
Vol 1049-1050 ◽  
pp. 1200-1204
Author(s):  
Yu Peng Cao ◽  
Yang Zhang ◽  
Jun Luo ◽  
Fu Sheng Jian ◽  
Xi Guo Dai ◽  
...  
Keyword(s):  
Electromagnetic Wave Propagation ◽  
Multipath Propagation ◽  
Engineering Application ◽  
Radar Detection ◽  
Sea Clutter ◽  
Reference Analysis ◽  
Detection Power ◽  
Detection Range ◽  
The Impact ◽  
Different Altitudes

According to the principle of electromagnetic wave propagation and the model of radar multipath propagation, this paper established radar detection power model in natural space under the impact of sea clutter, and on condition that conducting simulations to study detection power of shore-based radars on different altitudes and different operating frequencies. Simulation results indicate that when the radar operating frequency is constant, with the erection height increases, the detection range will increase at the same time, while significantly reduced about blind region. When the radar erection height is constant, blind region is filled with radars working at C, S and X operating frequencies. The effect of blind filling is of great importance for adjacent bands. This paper provides theoretical reference analysis for radar detection power assessing and overall with a strong engineering application value.

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