Questions tagged [channel-estimation]
The channel-estimation tag has no usage guidance.
15
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OFDM channel estimation using the transmitted signal multiplied with a matrix
I have OFDM system, where the modulated signal $x$ with length $N$, and $N$ is the number of subcarriers in OFDM symbol. $x$ is multiplied with a well-known unitary matrix $G \in N \times N$ before ...
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Fractionally spaced equalizer using LMS algorithm
I am doing a project about the fractionally spaced equalizers on matlab. The goal is to mitigate ISI on the signal using the LMS algorithm to update the tap weights of the FSE. Below i have uploaded ...
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Mapping from Antenna ports to Antenna Elements 5G NR
I have a question related to CSI-RS channel estimation.
Let us assume that the base station has 64 antennas and we decide to use 32 antenna ports for CSI-RS transmission. Also, UE has 4 antennas.
My ...
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Compressive sensing based sparse vector estimation
I am newbie in compressive sensing (CS), I read about compressive sensing and its use for sparse vector estimation. As I understood CS can be used either in time or frequency domain. For me, The part ...
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Calculation of the LMMSE Channel Estimator
Consider a MIMO system equipped with $N_t$ transmit antennas and $N_r$ receive antennas.
The received signal over $L$ snapshots are given by
$$Y = H X + Z,$$
where $X$ is the $N_t \times L$ transmited ...
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MMSE for channel estimation
I am learning about the MMSE detector and how to implement it.
I looked at some example codes on the Internet but many of them directly use the perfect channel when calculating the MMSE estimated ...
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Baseband algortihms in exisitng mobile sytems
For OFDM-based systems, many algorithms and techniques have been proposed for each baseband functionality like synchronization and channel estimation. Do practical systems like mobiles employ only one ...
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Is there any sampling offset when using external reference signal
I perform real experimental tests for optical communications using DCO-OFDM. The transmitted signal is uploaded into an AWG (arbitrary waveform generator), then bias (2.5 V) is added before adopting ...
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Tapped Delay Line channel model in wireless communication
Can someone explain the difference between tdl (Tapped Delay Line) -a , tdl-b and tdl-c and their use cases?
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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 ...
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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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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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Unable to estimate for AR model using OLS, Yule Walker and MLE
I am learning estimation methods following the book of Steven Kay, "Fundamentals of Statistical Processing, Volume I: Estimation Theory "
Theory says that if the measurement noise is ...
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Calculation of channel autocorrelation for LMMSE
I am currently trying to implement an LMMSE estimator/equalizer for a python based ofdm receiver. The actual reception is done with a SDR and iq-samples are stored in a file for the "ofdm-receiver" ...
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Can someone explain or elaborate on the channel estimation and noise variance estimation algorithms used in HF receiver?
For different type of communication, there is different type of algorithms to acquire CSI.
For instance 4G (LTE) network have SRS or DMRS to estimate the channel based on pilots.
I am designing a ...
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