Questions tagged [beamforming]
The beamforming tag has no usage guidance.
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Converting beam index to angular units
Assume I have a MIMO channel matrix \$H\$ of dimension [\$N_r\$ \$N_t\$ \$N_f\$] where \$N_r\$ are the number of antennas at the receiver, \$N_t\$ the number of antennas at the transmitter, and \$N_f\$...
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I am having trouble with wide beam of my ultrasonic sensor
I need to measure and detect a gap between two objects. I have an MB7062 (maxbotix) ultrasonic sonar sensor. Due to the wide beam of the sensor (FOV in distance of 2m is about 30cm from the center ...
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Radius of footprint vs altitude: math equation
I want to compare footprint size/beam size of satellite and plot “radius of footprint vs. altitude” variation. ( my main reference( see above) is 3GPPTR38_821/Solutions for {NR} to support non-...
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Why does literature call the response of an antenna array the array "manifold" vector?
Van Trees' Optimum Array Processing and other works (e.g. Wikipedia) refer to an antenna array's response (shifts in phase and differences in gain due to the angle of reception) at each element as the ...
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How well time synced do channels in a phased array need to be to be coherent?
In order for a narrowband phased array to be coherent channel to channel, what is the maximum timing jitter that can be tolerated between channels? I assume there can be a constant timing error ...
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About mobile user beamforming
I know that base station can generate beamforming vector (precoding) by channel state information.
If user have multi antenna, mobile user can also do beamforming?
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How to utilize receive spacial beamforming to allocate beams to different transmitter?
Assume there are 2 Base Stations (BSs) each is equipped with \$M\$ antennas serving 1 User Terminal (UT) simultaneously. Say if the UT has 4\$\times\$4 Uniform Planar antenna array, which means it can ...
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Is an antenna array with a tilted (rotated) antenna element always less optimal than a perfectly aligned antenna array?
Suppose I have a traditional linear antenna array. My element factor follows a cosine shape between 0-180 degrees. The relationship between my theoretical total antenna array pattern and the element ...
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Calculating antenna beam footprint from frequency
I need to compute a beam footprint, but I know only the frequency of the beam.
How can I compute the footptint?
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Uniform circular array (UCA) beamforming using FFT
As far as I know, conventional beamforming using FFT can return a range-angle map. However, this only works with a uniform linear array (ULA).
I'm wondering if the same approach works for UCA. I guess ...
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How to model MIMO channel matrix for numerical results
I am willing to include the channel matrix in my analytical model (which only includes pathloss and antenna gains). But from what I have seen, channel matrix can't be used to produce numerical results ...
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Do beam-forming devices expect a particular antenna configuration?
Do beam-forming devices expect a particular antenna configuration? For instance, do they expect the antennas to be a certain distance from one another? Or parallel to one another? Etc.
Background Info:...
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What is the relation between beamforming design and user scheduling in massive MIMO systems?
This may seem like a basic question, but since I am a nonexpert trying to do some collaboration with people working in this field, I need to understand the two concepts.
As I understand, beamforming ...
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Phased array receiver circular polarization
In a phased array system, what will have to change in a receiver's architecture if it needs to work for both linear and circular polarization?
I saw in one article it is said "Supports automatic ...
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Hardware implementations for a low-cost ADC array project
I wonder what would be the best hardware platform or architecture for implementing and building a lowish-cost system to sample audio capture over a large array of microphones or sensors? say, 300 or ...
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Beam Steering range of a phased array antenna system
What is the beam steering range of a phased array dependent on? For example, if I use an antenna array of Nx1, with a phase shifter resolution of \$\frac{2\pi}{k}\$ and the antenna elements spaced at \...
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Vertically oriented beams using antenna arrays
Referring to the above picture, can an antenna array mounted on Node A direct beams towards Node B and Node E, without the need for an antenna rotator (or manually orienting the antenna array towards ...
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How to tell the polarization (horizontal or vertical) of a microstrip linear array antenna just by inspection
I know that a linear array of microstrip patches can be either horizontal or vertical depending on its orientation.
Does the feed (input port of the array) determine the direction of polarization?
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bearing ambiguity resolve (direction finding) for multiple sources
I am working on wideband direction finding algorithms for passive sensors.
I started with Music algorithm. For practical reasons, the spacing can not be maintained lambda/2. For greater antenna ...
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