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# Questions tagged [capacity]

Capacity refers to the capability of a channel to transport data, typically measured in bits per channel usage.

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### "Best" energy efficiency via capacity of uncoded BPSK AWGN

I have numerically approximated the capacity of an uncoded, binary uniform input, real AWGN BPSK channel versus the SNR using mutual information and entropy, via Gauss-hermite quadrature. My task is ...
• 11
28 views

### What is the correct interpretation of the capacity formula with modulation?

Someone sent me the image below, and I think I'm confused as well. Is the second formula (modulation) correct? What does it mean? From the symbol, I think it represents capacity, but it doesn't make ...
• 131
1 vote
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### Applying Blahut-Arimoto Algorithm for AWGN Channels Capacity Calculation with Cost

I am exploring the Blahut-Arimoto algorithm (or any numerical method) for channel capacity calculations, particularly for continuous channels. I understand its application in discrete scenarios, but I ...
54 views

### Error in the visualizing Capacity bounds of FSO Links over Gamma-Gamma Atmospheric Turbulence Channels Using OOK Signaling?

I simply want to visualize 【Capacity bounds and mutual information】 versus 【SNR $\gamma$(dB) or probability $p$ (The input to the channel is a binomial distribution with parameter $p$)】 But I cannot ...
• 188
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### OFDM system capacity if we double the subcarriers

Suppose we have two OFDM based systems A & B. System A has $N$ subcarriers and bandwidth $W$, and the number of samples in the CP is 10% of $N$. System B has $2N$ subcarriers, $2W$ bandwidth and ...
• 11
1 vote
1k views

### What is the intuition explaining the Shannon-Hartley theorem?

In the digital domain, the signal to noise ratio (SNR) may be interpreted loosely but usefully as the number of discrete or quantized levels one can transmit reliably. For instance, loosely speaking, ...
• 331
86 views

### Are there any techniques that can achieve higher transmission rate than Shannon capacity?

The maximum bit rate that can be transmitted over a channel with bandwidth B is determined by Shannon C=B log(1+S/N) Are there any techniques that could break this limit?
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1 vote
63 views

### Modulation with Maximum Likelihood decoder and capacity

My question comes from the high spectrum efficiency claim of OFDM. This seems not correct IMHO, at least theoretically. For me, we lose energy in using cyclic prefix, hence OFDM should be a waste of ...
• 63
81 views

### Assessing relative wireless channel quality using Capacity and Condition Number CDFs

I have Channel capacity analysis figures for two wireless channels show below: My question: While ergodic capacity in the first subplots are very clear in conveying the channel capacity, How to make ...
• 418
1 vote