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.

18 questions with no upvoted or accepted answers
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418 views

Why is the relationship between Es/N0 and SNR different for complex and real signals?

I try to use the AWGN Channel model of MATLAB to build my simulation model, but the explanation of the relationship between Es/N0 and SNR in the official manual of MATLAB makes me confused. It says ...
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45 views

About discrete time model for wireless channel

I am trying to understand Section 2.2.3 of the book "Fundamentals of wireless communication" by Tse and Viswanath. In this section the authors explain how to go from the continuous time ...
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142 views

Degrees of freedom in coding (for a communication channel)

I was reading on my lecture slides about how to achieve diversity (i.e. transmit more copies of the same message in order to avoid its corruption; this technique may be realized by repeating the ...
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1answer
61 views

how to determine a length of a channel? ( given path, delay)

Given a channel matrices for each subcarrier of a frequency selective channel (OFDM): i.i.d.. channel =(randn(ntx,nrx, N)+1i*randn(ntx,nrx, N))/sqrt(2); simulated ...
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1answer
37 views

Interference Distribution Assumption in NOMA IoT Scenario

I am assuming a NOMA IoT Uplink scenario, which is interference marred. I have to ascertain the SINR at the Access Point (AP) for the NOMA users. A sub-channel is allocated to various users and ...
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21 views

I am trying to estimate the Channel Impulse Response(time domain) for a 5G-NR signal using the DMRS-PBCH pilots only , any suggestions

I want to obtain the $h(t)$, the channel impulse response for my NR signal using the DMRS PBCH pilots only.
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29 views

Pilot Signal Overhead

I have a doubt regarding Pilot signals such as CSI-RS in NR. Using a large number of CSI-RS affects Datarate significantly? or it is negligible? Because I wonder it is meaningful that optimize the ...
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18 views

Channel Parameters

I'm a newbie in wireless communication. I found one channel model and have some questions regarding its parameters In this channel model below.. $\alpha_m,$$e^{j\varphi(k,n)}$, $\tau_m$, $\theta_m$, $...
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34 views

Delta dirac function in the Channel model

I have a question about the channel model below. theta, phi denotes AoA(Angle of Arrival), AoD(Angle of Departure) from receiver and transmitter. I know that channel impulse response is the sum of ...
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0answers
17 views

Multiple Transmitter Localization - Channel Modelling

I read in this paper about to localize multiple transmitter in a wireless scenario. I know from other source that this hypothesis is completely false. What do you think? Is there in the literature ...
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1answer
113 views

Averaging two channels with Python

I am trying to convert a stereo audio into a mono one by averaging both channels with Python. My audio is stored in sound and I calculate the average using ...
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24 views

Generating a 2D delay-Doppler channel matrix

I was wondering if anyone here has any idea on 2D delay-Doppler channel and how to generate the channel matrix? Even a hint or a resource would be helpful. I just want to understand and visualize the ...
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35 views

Unstable Phase in Channel Impulse Response

I'm using DW1000 UWB radio transceiver and extract its channel impulse response (CIR). The CIR output by the transceiver is the complex baseband CIR. In a static environment, the CIR is a LTI filter ...
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12 views

Uplink Pilot Design in TDD based OFDM system

In a paper “Design of Orthogonal Uplink Pilot Sequences for TDD Massive MIMO under Pilot Contamination”,it was mentioned that, In the uplink channel estimation, if each user occupy all available ...
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26 views

What is meant by Beamspace domain and antenna domain for channel matrix?

I am not from Engineering background that's why asking these overly simplistic question. Anyone who can answer. These are basic research questions. Thanks
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74 views

Least square error channel estimation in the presence of AWGN noise

I want to implement Least Square (LS) channel estimation method in the presense of AWGN noise in MATLAB. $y(n) = x(n) * h(n)$ $Y(k) = X(k)H(K)$ Y(k) is the received signal in frequency ...
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1answer
31 views

Correlated fading channel: transmit and receive antenna correlation matrices

I am trying to create a non-i.i.d channel: correlated Rayleigh fading channel. $$ H= R_H \cdot H_o,$$ where $H_o$ is i.i.d. channel ( uncorrelated) and $ R_H$ is a channel correlation matrix, is ...
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165 views

What are TDL and CDL channel models in principle, and which variation can be used for indoor and outdoor environment, respectively?

I am making a simulation using 5G-toolbox in Matlab. IN 5Gtoolbox we have two kind of channels, CDLChannel and TDLChannel. Now, CDL means Clusteresd Delay Line, and TDL means Tapped Delay Lines. But ...