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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.

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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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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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I am confused in modeling rayleigh fading channel

I am new to wireless communication and want to model a wireless communication system y = h * s + n where h = x + iy and ...
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QPSK Channel Detection Algorithm

I send a QPSK signal over pluto sdr and receive it from rtlsdr. As you can see from the screenshot below SNR of the received signal is very high, and the signal is very distinguishable. Hence, it is ...
unique's user avatar
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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 ...
Jacob's user avatar
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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 ...
Interception's user avatar
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Coordinates of cluster in CDL channel model

I was reading the 3gpp specification to understand the CDL channel models. (See section 7.7.1 and tables within). It says that for a cluster $C$,it has angles of arrival/departure along the azimuth $(\...
wanderer's user avatar
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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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Channel Estimate for OFDM shows distortion for first last order samples

The Channel Gain Estimation was obtained using Least Square method as follows: Hk= mean(Rx_LTS ./ Tx_LTS, 2); k= -26 to 26 Where Rx_LTS is the received long training sequence (52 samples after ...
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Channel Estimation of OFDM using Long training Sequences

Based on IEEE 802.11a Standards, I am using two Training Sequence-Preamble for Synchronization and Channel estimation. I have read in some papers that the channel estimation is performed by taking the ...
Walkürie's user avatar
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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?
Ryo Onishi's user avatar
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What is self-interference channel matrix in full-duplex system?

I am learning about full-duplexing systems, and I saw that we have self-interference (SI) in the systems. I read some papers that model the SI channel of the base station ${H_{SI}} \in \mathbb{C}^{L \...
Hiếu Hoàng's user avatar
1 vote
1 answer
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Delayed waves existing MIMO eigenmode transmission

Assume that the numbers of transmitting antennas, receiving antennas, and delayed waves are $N_t$, $N_r$, and $N_p$, respectively. The channel matrix is three-dimensional ($N_r$, $N_t$, $N_p$). In ...
Ryo Onishi's user avatar
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How to calculate capacity using Shannon and path-loss?

I am working on tasks offloading on edge computing. I need to find the transmission delay, through calculating Shannon capacity-theoretical maximum data rate- when sending results from the server back ...
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Need to write a simple code in matlab of training sequence or zadoff Chu sequence for my OFDM signal-synchronization

I have written a complete code, in matlab, for my ofdm signal for the transmitter and receiver. Now I want to transmit my ofdm signal via wireless channel using SDR. Now, I need to combine a simple ...
Walkürie's user avatar
1 vote
3 answers
168 views

GRC implementation for IQ data acquisition of 2-GFSK Radio

I am trying to design a 2-GFSK receiver for acquiring IQ symbols. The aim is to implement the entire receiver chain but the decision stage. The 2-GFSK waveform is being generated by a standard IoT ...
Maaz Awan's user avatar
2 votes
1 answer
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Joint channel model for space-air-ground link

Recently I have been interested in the following: 6G for Connected Sky: A Vision for Integrating Terrestrial and Non-Terrestrial Networks Space-Air-Ground Integrated 6G Wireless Communication ...
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How to understand Fading Channel with no CSI at the Receiver

From the book Fundamentals of Massive MIMO, the section 2.3.4 shows that the expression of the received signal in fading channel with additive non-Gaussian noise and no CSI at receiver is dervied as: $...
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How to understand the relationship between complex baseband equivalent model and block-fading channel model?

Considering a bandpass communication system, where $y(t)=x(t)*h(t)+n(t)$ ($x(t)$ is the transmitted bandpass symbol, $h(t)$ is the channel impulse response, $n(t)$ is the AWGN, and "$*$" ...
Hang Deng's user avatar
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How correctly choose a channel model?

How correctly choose a channel model: Rician and Rayleigh channel model? The Rician channel assumes dominant line of sight (LoS) paths from the transmitter to the receiver and other scattering paths. ...
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2 votes
1 answer
179 views

How to calculate and compensate group delay caused by channel and how to define group delay to wideband signal?

Suppose a wideband signal is sent and received by a RX. If different frequency components travel in different speed then there exists group delay in the signal, right? Not consider the multipath ...
Xiang Li's user avatar
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Distance between Transceiver and Receiver and AWGN

Is there a relationship between the distance between the transceiver and the receiver and the AWGN? When the distance between the transceiver and receiver increases, the AWGN level decreases?
Kitae Kim's user avatar
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112 views

Propagation channel model for 5G/6G commmunication

from a course in signal processing, I know some radio propagation models such as Free-space path loss, Okumura model, Hata model, and COST Hata model. They applied to a range of frequencies for up to ...
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Noise variance estimation

could anyone recommend some articles how to estimate noise variance for the single carriers system with burst mode transmission (preamble+data TDMA)? My goal at the beginning is to develop skills how ...
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Which are the realictic enviroment will be suitable for TDLC300 channel model?

TR 38.901 Section 7.7.2 mentioned that the TDL-A, TDL-B, and TDL-C channel models are constructed for NLOS scenarios. In TS 38.101-4 Annex B.2.1, in Table B.2.1.1-1 (picture is attached), delay ...
Aragorn's user avatar
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1 answer
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How to code Rician fading channel gains from k-factor?

I know that MATLAB provides some built-in functions but I am not interested in those. I want to know how can we code to obtain the Rician fading channel gains from normal or Gaussian distributions. ...
ZZ1's user avatar
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Why does one of my OFDM subcarriers have a much higher gain than the rest in GNUradio?

I'm using a fairly standard setup after the ofdm flowgraph examples provided by gnuradio. When I look at the absolute value of the received complex symbols in the first sync word (and every other ...
eee's user avatar
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Related to wireless channel variance?

I am reading wireless research papers and found that mostly the wireless channel is considered to be Zero mean circularly symmetric Complex Gaussian (ZMCSCG) with variance 1 or 2 or 5 or 10 etc. My ...
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How to estimate Range, Doppler and Angle with FMCW MIMO Radar?

I am trying to obtain the range, Doppler and angle of arrival estimation with an TDM MIMO FMCW radar. Actually, I have completed this process. In doing so, however, a few things remained unclear. ...
abdullah A's user avatar
4 votes
3 answers
493 views

Undestanding antenna gain applicability

While searching for the info about antenna gain and why it is GAIN I found this interesting example: If the two antennas in the drawing are “welded” together, how much power will be measured at point ...
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What is meant by channel knowledge? Difference between partial and full?

Keep coming across the term channel knowledge (specifically in the transmitter) in a reading for class but can't really grasp the idea and don't see a clear cut definition. From what I understand it ...
lceans's user avatar
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How to resolve some inconsistencies in the mathematical model for the narrowband fading channel?

I am reading Wireless Communications by Andrea Goldsmith. There the author mentions that for narrow band channel the received signal can be given as: $$r(t)=\text{Re} \left\{u(t)\text{exp}(j2\pi f_ct)\...
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33 views

Why is there fear of interference between 5G and airline altimeter C-band?

The C-band frequency range to be used for the 5G-advanced rollout is the US is in the 3.7-3.98 GHz range. Whereas altimeters operate in the 4.2-4.4 GHz range. Is there any genuine reason to worry ...
Naveen's user avatar
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2 votes
1 answer
83 views

Simulating Es/N0 by adding noise to analog signal

I believe I am familiar with simulating $E_s/N_0$ by adding noise to the output of the matched filter, but what would be the correct way to simulate $E_s/N_0$ starting with the analog signal at the ...
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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 ...
Kitae Kim's user avatar
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1 answer
38 views

What does $\mathcal{ E}(|h|^2)$, where $|h|^2$ is power of the channel gain $h$ represent?

I came across this notation of $\mathcal{E}(|h|^2)$ in a research article. $h$ is the channel gain of a wireless communication channel. In particular, a Rayleigh fading channel. I know that $|h|^2$ ...
nashynash's user avatar
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1 answer
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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 ...
SJa's user avatar
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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)}$, $\tau_m$, $\theta_m$, $...
Kitae Kim's user avatar
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93 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 ...
Kitae Kim's user avatar
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1 answer
106 views

Can a cosine modulated complex valued baseband signal be transmitted over physical channels?

I am reading Digital Communication by Lee and Messerschmitt. In Chapter 6 on modulation, the authors say: "Modulating a complex-valued baseband signal with a cosine wave yields complex-valued ...
Userhanu's user avatar
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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 ...
CipherX's user avatar
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1 answer
683 views

How to estimate optimal channel length for multichannel blind system identification?

Let P1 and P2 two distinct output signals that are generated by a common input signal S. If you want to estimate S using multichannel blind system identification algorithms, you have to specify the ...
Laplacetransform's user avatar
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1 answer
2k 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 ...
Arnau's user avatar
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1 answer
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How does higher received signal power enable higher data rates?

On page 30, of the book Fundamentals of LTE by Arunabha Ghosh et al. it is written: This allows broadcast signals from different cells to combine over the air to significantly enhance the received ...
Shashank V M's user avatar
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107 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 ...
Amit Sravan's user avatar
0 votes
1 answer
1k views

Understanding MMSE equalizer equation

I have read many online materials and journal paper where the equation for MMSE equalizer is given as: $G_{MMSE}$ = $H^H(HH^H+\nu^2I )$ where $H$ is the channel, $H^H$ is its hermitian. $\nu^2$ is ...
SAM's user avatar
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1 answer
450 views

Can Oversampling help to mitigate the effect of additive white gaussian noise?

Oversampling the signal at the receiver's ADC is a common technique to improve the ADC's resolution, dynamic range and to improve the signal to noise ratio (SNR) due to ADC quantizaiton noise, thermal ...
Amro Goneim's user avatar
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2 answers
394 views

Optimal FEC option for extremely low SNR situation

I am new to this site, which I joined with the aim of finding someone to help me with a little doubt. I am trying to design a system that must be able to work at extremely low (the lower, the better, ...
user3141592's user avatar