# Questions tagged [mimo]

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### LTE system. How to compute precoder for resourse block

guys! I am studying a massive Mimo system and 3gpp LTE system and have questions about precoding in the LTE system. In LTE RB (resource block) is used to group consecutive subcarriers. To compute ...
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### Pairwise Error Probability simulation versus SNR for Space-time code

I have a MIMO system using Space-time coding. I am required to produce simulation results in the form $\text{PEP}=f(\text{SNR})$, meaning a curve representing the Pairwise Error Probability (PEP) for ...
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Recently, I am reading paper . In this paper, the author wrote: In MIMO-MRC systems in the absence of interferers, the signal vector at the received $n_R$ antennas is given by $$\mathbf{r} = \... 1answer 83 views ### Using MIMO with DS-CDMA and spread spectrum I have a question about using MIMO with DS-CDMA. suppose we are using 4 TX antennas, and 4 RX antennas, then the Reyleigh ... 2answers 111 views ### MU-MIMO Sensitivity to Line of Sight (LOS) Why do researchers talk about MU-MIMO being "less sensitive to line of sight" / "LOS Okay"? For example in this video, time=[00:40,00:42] Similarly, "User separation based on spatial channel ... 1answer 46 views ### Channel direction I am reading a book called Massive MIMO Networks: Spectral, Energy, and Hardware Efficiency, and it implies that$$\frac{\mathbf{h}}{\sqrt{\text{E}\left\{\|\mathbf{h}\|^2\right\}}}$$is the channel ... 1answer 375 views ### What is the index modulation in OFDM and Subcarrier Index modulation? I'm new here, I'd like to ask about the OFDM-IM (OFDM - Index modulation), what is it and how it works? Is it the same as SIM-OFDM? I checked white papers, I see it's using the index of sub-... 1answer 402 views ### Use of Long Training Field (LTF) of 802.11 standard In 802.11a/n the preamble part has L-LTF(Legacy-Long Training Field) and HT-LTF(High Throughput-Long Training Field). I want to clarify my understanding of these two fields: Are the only difference ... 1answer 83 views ### Why Isn't the ML Estimator (MLE) in MIMO Spatial Multiplexing Obtained by the Least Squares Solution? In the simplest scenario of MIMO spatial multiplexing:$$\mathbf{y} = H\mathbf{s} + \mathbf{n}$$where: \mathbf{s}=[s_0,s_1,...s_{M-1}] \\\mathbf{y}=[y_0,y_1,...y_{N-1}] \mathbf{n}=[n_0,n_1,...... 2answers 311 views ### DOA - 1D Music Algorithm I am currently working on a MUSIC algorithm for DOA of RF emitters in 3D. At the first stage, interested to apply the 1D MUSIC using a linear array of 4 antennas, and estimate only the azimuth of the ... 2answers 115 views ### How to solve equations for the MMSE receiver? Given the following equations for the achievable rate of the Minimum Mean-Squared Error Receiver :$$\mu = \frac{1}{K-1} \sum_{i=1, i \neq k}^{K}{\frac{1}{Mpd_{i}\left(1 - \frac{K-1}{M}+ \frac{K-1}...
For a flat fading channel (SISO system) we have: $y=h \star s+n$ But for a mimo system, we have: $y=Hx+n$ with $H \in \mathbb{C}^{N_r \times N_t}$ Why is there not the product of convolution for a ...