lteOFDMInfo
OFDM modulation related information
Description
Examples
Get Information Related to OFDM Modulation
Find the sampling rate of a 50 resource block configuration, corresponding to a 10 MHz waveform after OFDM modulation.
enb = struct('NDLRB',50,'CyclicPrefix','Normal'); lteOFDMInfo(enb)
ans = struct with fields:
SamplingRate: 15360000
Nfft: 1024
Windowing: 6
CyclicPrefixLengths: [80 72 72 72 72 72 72 80 72 72 72 72 72 72]
Input Arguments
enb
— Cell-wide settings
structure
Cell-wide settings, specified as a structure. enb
contains
the following fields.
Parameter Field | Required or Optional | Values | Description |
---|---|---|---|
NDLRB | Required | Scalar integer from 6 to 110 | Number of downlink resource blocks () |
CyclicPrefix | Optional |
| Cyclic prefix length |
Windowing | Optional | Nonnegative integer | Number of time-domain samples over which the function applies windowing and overlapping of OFDM symbols |
Data Types: struct
Nfft
— Number of IFFT points
positive integer
The number of IFFT points to use in the OFDM modulation, specified as a positive integer.
Output Arguments
info
— OFDM information
structure
OFDM information, returned as a structure. info
contains the following fields.
SamplingRate
— Sampling rate of the OFDM modulator
integer
Sampling rate of the OFDM modulator, returned as an integer.
Data Types: double
Nfft
— Number of FFT points
scalar power of 2
Number of FFT points used in the OFDM modulator, returned as a scalar power of 2.
Data Types: uint32
Windowing
— OFDM sample span
nonnegative integer
Number of time-domain samples over which the function applies windowing and overlapping of OFDM symbols, returned as a nonnegative integer.
If enb.Windowing
is absent, info.Windowing
returns
a default value chosen as a function of enb.NDLRB
to
compromise between the effective duration of cyclic prefix (and therefore
the channel delay spread tolerance) and the spectral characteristics
of the transmitted signal (not considering any additional FIR filtering).
See lteOFDMModulate
for details.
Data Types: int32
CyclicPrefixLengths
— Cyclic prefix length
even integer
Cyclic prefix length (in samples) of each OFDM symbol in a subframe.
info.Nfft | CyclicPrefixLengths | |
---|---|---|
for CyclicPrefix = 'Normal' | for CyclicPrefix = 'Extended' | |
2048 | [160 144 144 144 144 144 144 160 144 144 144 144 144 144] | [512 512 512 512 512 512 512 512 512 512 512 512] |
1024 | [80 72 72 72 72 72 72 80 72 72 72 72 72 72] | [256 256 256 256 256 256 256 256 256 256 256 256] |
512 | [40 36 36 36 36 36 36 40 36 36 36 36 36 36] | [128 128 128 128 128 128 128 128 128 128 128 128] |
256 | [20 18 18 18 18 18 18 20 18 18 18 18 18 18] | [64 64 64 64 64 64 64 64 64 64 64 64] |
128 | [10 9 9 9 9 9 9 10 9 9 9 9 9 9] | [32 32 32 32 32 32 32 32 32 32 32 32] |
Note
For info
.Nfft
< 2048, info
.CyclicPrefixLengths
are
the CyclicPrefixLengths
for info
.Nfft
=
2048 scaled by info
.Nfft
/
2048.
Data Types: uint32
Data Types: struct
Version History
Introduced in R2014aR2022b: Specify IFFT size
You can specify the IFFT size by using the Nfft
input.
See Also
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