Questions tagged [coding]
The coding tag has no usage guidance.
20
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Is there a procedure to build RLL code with arbitrary signature?
I am wondering if there is a procedure to build a generic $RLL(x, y)$ encoding.
This article seems to describe one, but I have compared it to the wiki page, and they do not seem to agree.
Has anyone ...
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51 views
Understanding of Reed Solomon code
We send the data in bytes to the RS Encoder block. The RS Encoder block encodes the data with the Reed Solomon (225,223) code. It waits for 223 bytes and after this encode them to make a codeword of ...
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1answer
40 views
Multi-bit gold code
Is the multi-bit gold code resulted from a xor of two different multi-bit m-sequences will still maintain its statistical property (bounded correlation, distribution of 1 and 0) ?
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30 views
How to apply an offset to a complex exponential without chopping it off?
I am trying to encode a bitstream as offset in a complex exponential, but when I do, the sinusoids get chopped off. Do I need to apply a lowpass to the bitstream or is there a more elegant way?
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1answer
49 views
Transition table / matrix for convolutional encoder K=3 understandings
Im trying to understand convolutional encoder $K=3$ , and I almost understand it but still confused about what's called transition matrix which in other words it means
what input value ($0$ or $1$) ...
2
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1answer
93 views
Finding preferred pair of $m$-sequence for Gold code
I would like to find a preferred pair of $m$-sequence of degree 34 (not a multiple of 4) for Gold code. However, I am lost when I am checking William Wesley Peterson's table in his Error-correcting ...
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1answer
102 views
Differential Encoding for M-PSK
Confused about a few topics w.r.t. differential encoding/decoding. First, consider the below BER curve taken from wikipedia ( https://en.wikipedia.org/wiki/Phase-shift_keying ) comparing BPSK/QPSK and ...
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1answer
36 views
Most reliable way to decode PAM2 signal with unknown signal levels?
I assume this is pretty much a standard problem. I have a PAM2 signal that comes from a complex envelope (i.e., it is not zero-centered) and is heavily imposed by noise.
This shows 20 different ...
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2answers
47 views
Can we broadcast two messages using NOMA?
Is it possible for a transmitter to broadcast two messages to a set of receivers at the same time using superposition coding (Non-Orthogonal Multiple Access - NOMA)?
A transmitter has two messages $...
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2answers
41 views
Interleaving or randomisation?
I am trying to implement a digital communication system as a learning exercise. For error correction, I am using two concatenated codes (RS and convolutional). However, I read that, in order to reduce ...
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1answer
28 views
What's the difference between quantization and coding?
From what I understand quantization takes an analog signal and assigns numerical values to it as convert it to a discrete signal. However coding converts a signal into binary. It seems like coding is ...
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1answer
39 views
Bandwidth and BER of FM0 encoding
What is the bandwidth (i.e., the lowest possible bandwidth) and BER for FM0 encoding?
To be precise, this is my example of an FM0 encoded waveform:
There is always a transition between each bit. For ...
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2answers
80 views
Definition of Perfect Code (and example of Hamming Code)
Let's consider the following sentences about coding a message before transmitting it in a communication system (here you find the complete pdf)
First question: can you explain me these two ...
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51 views
Capacity achieving codes for BPSK at low SNR
I don't know a lot about comm system design.
I have an AWGN channel and low SNR (-3dB). Bandwidth is constrained to some maximum, B. I would like to know good choices of modulation and coding to ...
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1answer
21 views
How good is the Leech lattice for AWGN coding or MSE quantization of Gaussian sources?
Anyone know where to find graphs showing how well it works vs other schemes? thanks
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1answer
48 views
STBC Rank Criteria Explanation
I am learning about space-time block coding and I am trying to understand why the rank criteria is a good measure of diversity gain. I know that we want to maximize the distance between codewords $X_i,...
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1answer
50 views
What is the Asymptotic Equipartition Property (AEP)?
I am currently studying about Polar Codes in 5G standard and while reading my paper I found something called AEP which is required for channel coding. I surfed the web but didn't found a satisfying ...
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1answer
61 views
Prefix code of symbol pairs
An input sequence consists of two symbols, each independently and randomly chosen from a set of symbols with known associated probabilities. Each symbol is independently encoded using a prefix code ...
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1answer
33 views
Randomized prefix code
An input symbol is randomly chosen from a set of symbols with known associated probabilities and encoded using a prefix code that minimizes the expected codeword length. Is it possible to further ...
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2answers
1k views
FFT vs DFT Run Time Comparison (Complexity Analysis) in MATLAB
So we were given an assignment to plot the time taken by the FFT algorithm by MATLAB and a DFT algorithm written by me in MATLAB.G
The expected output should have been the DFT algorithm following the ...
