Questions tagged [digital-communications]

Digital Communication is the physical transfer of data (a digital bit stream) over a point-to-point or point-to-multipoint communication channel.

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BPSK decoding with a non-ideal transmission medium

I'm simulating tranmission via power line communications (PLC) using BPSK. Due to the coupling circuit and slightly inductive nature of the line, the BPSK signal received is far from ideal. In the ...
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Distortion-Rate function for standard Gaussian signals quantized with a uniform alphabet

Let's say $X \sim N(0, 1)$ is a standard Gaussian input signal and $Y \sim U\{y_1, y_2, \cdots, y_{16}\}$ follows a discrete uniform distribution (in fact, $\{y_1, y_2, \cdots, y_{16}\}$ is a ...
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In textbook "Wireless Communications Principles and Practice" by Theodore S. Rappaport, the expression of Fresnel reflection coefficient ($\Gamma$) for parallel polarization is given as $\... 0 votes 1 answer 80 views Sample Use vs Sampling Frequency I need to acquire an analog signal via an ADC and send it via a digital communication line (CAN bus) with a given frequency$f_{send}=100Hz$. If I understand correctly this means that this constraint ... 0 votes 1 answer 27 views Understanding frequency band specification in wireless networks I am trying to clear my understanding of frequency bands. When a particular wireless network standard like WiFi 6 claims operation in the$2.4$GHz or$5$GHz band, what do these values refer to? I am ... 1 vote 1 answer 205 views MIMO reading clarification On page 301 of https://stanford.edu/~dntse/Chapters_PDF/Fundamentals_Wireless_Communication_chapter7.pdf, equation (7.33) says that the magnitude of the dot product of two unit complex vectors is ... 3 votes 1 answer 417 views Use of the harris-Moerder Nyquist Pulse Shaping Filter I became aware today through fred harris' excellent presentation at the DSP Online Conference (https://www.dsponlineconference.com/) of the harris-Moerder pulse shaping filter which was published 15 ... 1 vote 0 answers 83 views Channel equalization in uplink I have a multiuser uplink signal $$Y=h_1x_1+h_2x_2$$ where,$h_1$and$h_2$are channels for user 1 and user2 respectively. At the receiver how can I equalize the signal$Y$, assuming known$h_1$and$...
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In the MC-CDMA (to simplify with $1$ user), the spreading sequence is a sequence of -1 and 1. I would like to know if it is possible to replace this sequence with a signal $s(t)$ of bandwidth $B$ to ...
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Discrete Frequency representation for central frequency/ discretize up-converted signal in time and frequency

I want to analyze a signal after up-conversion in discrete time and frequency, for example: Let's assume a continuous up-converted signal is: e^{j2\pi ft} \cdot e^{j2\pi f_c t} = e^{j 2 \pi (f+fc) t}...
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Symbol timing recovery design

I am trying to design the Symbol timing recovery(#STR) block of #DVBS Receiver. These are the specifications Symbol rate ($f_s$) = $2\textrm{ MHz}$ Acquisition range = $10\%$ of Symbol rate ...
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How to estimate the average distance between peaks (maxima) of the magnitude of an OFDM signal?

Given an arbitrary configuration of carriers having bandwidths that belong to the 3GPP standard (5, 10, 15, 20, 25, 30, 35, 40, 50, ..., 100 MHz), is there a method/rule-of-thumb to estimate the ...