ofdmdemod
Demodulate time-domain signal using orthogonal frequency division multiplexing (OFDM)
Syntax
Description
performs OFDM demodulation on the input time domain signal specified in
outSym
= ofdmdemod(ofdmSig
,nfft
,cplen
)ofdmSig
, using an FFT size specified by
nfft
and cyclic prefix length specified by
cplen
. For information, see OFDM Demodulation.
removes null subcarriers from the locations specified in
outSym
= ofdmdemod(ofdmSig
,nfft
,cplen
,symOffset
,nullidx
)nullidx
. For this syntax, the symbol sampling offset is
applied to each OFDM symbol and the number of rows in the output is
nfft
–
length(
, which accounts for the
removal of null subcarriers. Use null subcarriers to account for guard bands and DC
subcarriers. For information, see Subcarrier Allocation and Guard Bands.nullidx
)
[
returns pilot subcarriers for the pilot indices specified in
outSym
,pilots
] = ofdmdemod(ofdmSig
,nfft
,cplen
,symOffset
,nullidx
,pilotidx
)pilotidx
. For this syntax, the symbol sampling offset is
applied to each OFDM symbol and number of rows in the output is
nfft
–
length(
–
nullidx
)length(
, which accounts for
the removal of null and pilot subcarriers. The function assumes that pilot
subcarrier locations are the same across each OFDM symbol and transmit
antenna.pilotidx
)
specifies the optional oversampling factor name-value argument in addition to input
arguments in previous syntaxes. The oversampling factor for an upsampled input
signal must be specified as a positive scalar. Additionally, the products
(outSym
= ofdmdemod(ofdmSig
,nfft
,cplen
,___,OvesamplingFactor=Value)OversamplingFactor
×nfft
) and
(OversamplingFactor
×cplen
) must both
result in integers. The default value for OversamplingFactor
is
1
.
For example, ofdmdemod(inSym,nfft,cplen,OversamplingFactor=2)
demodulates assuming the input signal was upsampled by a factor of two.
Examples
Input Arguments
Output Arguments
More About
Extended Capabilities
Version History
Introduced in R2018a