Questions tagged [channel]
A channel for communication between transmitter and receiver. Sometimes a channel is multi-input/multi-output, allowing for multiple transmitters and multiple receivers.
78 questions
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What is Channel State Information?
I have channel sounding data of Bluetooth, which is basically IQ data of Initiator and Reflector for $72$ channels. From this I can get channel transfer function, using below relation, $$ H \left( f \...
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60 views
Mutual Information and Data Rate
Mutual information in Theory Communication context quantifies the amount of information sucessfully transmitted over the channel or the the amount of information we obtain given an observed prior ...
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Understanding Polyphase Filter Banks
I'm studying Polyphase Filter Banks (PFB) but am having some difficulty grasping the concept. Let me clarify my understanding. Suppose we have a signal ranging from DC to 1.25 GHz, and each channel ...
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Realistic simulation for USRP transmission
I want to simulate a QPSK transmission over two USRP to test some DSP algorithms in my computer with MATLAB. Hence, I would like to include every impairment USRP and the environment has. The center ...
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Channel Impulse Response of Visible Light Communication link
I'm doing research into Channel Impulse Response of VLC links for my MSc degree thesis and I have encountered a lot of troubles when doing experimental work and processing the data. For context, the ...
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107 views
Finding Modulation Type and Transmission Power Given Link Requirements
I know that the key to choose the modulation is to find the signal to noise ratio and "cross it" with the given error probability, but I am facing some problems during the calculation of ...
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158 views
Detect active channel used in a lora network
I am trying for quite some days now to detect which channel was used for a transmitted LoRaWAN frame. For those who are not familiar with lora: LoRa makes use of the CSS modulation technique, which is ...
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1 vote
2 answers
426 views
Channel impulse response (CIR) and OFDM relationship
In Chapter 3 of the [Goldsmith book] (https://faee.sut.ac.ir/Downloads/AcademicStaff/1/Courses/7/Andrea%20Goldsmith-Wireless%20Communications-Cambridge%20University%20Press%20(2005).pdf) we can see ...
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41 views
Comparison channel impulse in DD and TF domains
How can I plot a similar comparison plot in Matlab? My attempt I have tried to create a random function like/ Matlab: rand(M, N) and then take SFFT of it ...
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Received signal from channel model
I'm struggling with this because I don't fully understand it. My goal is to estimate a received signal that is transmitted through a channel that follow a stochastic process. My doubt is, if the PDF ...
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143 views
How do you model the channel between a satellite(LEO) and a ground station?
If the transmitter is on a satellite in a circular orbit at Low Earth Orbit with a QPSK modulated waveform at 1 megabaud centered at 12 GHz downlinking to the receiver, which is stationary on the ...
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216 views
Understanding wireless channel model as a component of the whole communication system pipeline. What am I missing in the process?
Disclaimer: I am not an expert in communication and signal processing. For simplicity of the discussion, I only consider scalar values. Consider a communication system where a sender transmit a ...
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Impulse response and amplitude-frequency characteristic of a communication channel
The task is to implement communication system for transmission of 32 multiplexed signals through communication channel represented by copper cable whose frequency characteristic is given by: $$H(f) = ...
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872 views
How to calculate The Signal-to-Noise Ratio (SNR) in dB (different units)?
Recently, I've ventured into a new domain that I intend to incorporate into my work. After thorough research and consultation, I've found this model to calculate the data transmission rate (Capacity). ...
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Is OFDM equalization performed every 14 symbols?
The number of symbols and slot in a subframe differs depending on the subcarrier spacing Is equalization processing performed for each slot? Or per subframe?
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