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Results tagged with ofdm
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user 10374
OFDM stands for Orthogonal, Frequency-Division Multiplexing.
6
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Accepted
Can we do cyclic prefix with zeros in OFDM rather than with samples from end of the ofdm sym...
There are two major approaches for cyclic extension in OFDM systems - CP (cyclic prefix) and ZP (zero padding, also called Trailing Zeros, TZ). … I've heard ZP is popular in hydroacoustic OFDM techniques of equalization so you can also refer to this topic.
Hope it helps. …
- 1,105
4
votes
OFDM modulator in LTE
Each sample of OFDM symbol from the output of IFFT is weighted sum of all QAM/PSK modulated subcarriers from the input of IFFT. … That's why OFDM + MIMO is so popular combination today. …
- 1,105
1
vote
Accepted
Crest Factor of OFDM signal
In statistical case OFDM (without specific PAPR reduction precoding and with most of subcarriers used) signal could be modelled as white Gaussian process. … So PDF of OFDM signal is well-known one for normal distribution:
$f(x) = 1/(\sigma\cdot\sqrt{2\cdot\pi}) \cdot \exp(-(x-\mu)^2/(2\sigma^2))$
For OFDM $\mu=0$. …
- 1,105
1
vote
Simulating noise in OFDM
You shouldn't do a measurement with only one OFDM symbol at first. Instead create some random data, perform QAM modulation, devide QAM symbols array in $N$ OFDM data blocks and make OFDM symbols. … After that if you perform OFDM demodulation and than QAM demodulation you'll achive BER you're expecting to be for SNR you've choosen. …
- 1,105