lteSCFDMAInfo
Get SC-FDMA modulation information
Syntax
Description
returns the structure info
= lteSCFDMAInfo(ue
)info
, which contains information related
to the single-carrier frequency-division multiplexing (SC-FDMA) modulation performed
by the lteSCFDMAModulate
function for the
user-equipment-specific (UE-specific) settings structure, ue
.
Examples
Get SC-FDMA Modulation Information
Initialize UE-specific settings by setting the number of resource blocks.
ue = struct('NULRB',50);
Get SC-FDMA modulation information and display the sampling rate.
info = lteSCFDMAInfo(ue); disp(info.SamplingRate);
15360000
Get Sampling Rate of NB-IoT Uplink Waveform
Get the sampling rate of an NB-IoT uplink waveform with 3.75-kHz subcarrier spacing after SC-FDMA modulation.
Specify the NB-IoT uplink subcarrier spacing.
ue.NBULSubcarrierSpacing = '3.75kHz';
Get the SC-FDMA modulation information and display the sampling rate of the time-domain waveform.
info = lteSCFDMAInfo(ue); disp(info.SamplingRate);
1920000
Input Arguments
ue
— UE-specific settings
structure
UE-specific settings, specified as a structure. The fields you specify in
ue
determine whether the function returns SC-FDMA
modulation information for an LTE or NB-IoT configuration. To choose an LTE
configuration, specify the NULRB
field. To choose an
NB-IoT configuration, specify the NBULSubcarrierSpacing
field. The CyclicPrefixUL
field is optional and is
applicable only for an LTE configuration. The Windowing
field is optional, and you can specify it for either an LTE or NB-IoT
configuration.
NULRB
— Number of uplink resource blocks
integer in the interval [6, 110]
Number of uplink resource blocks, , specified as an integer in the interval [6, 110]. To return SC-FDMA modulation information for an LTE configuration, you must specify this field.
Data Types: double
CyclicPrefixUL
— Cyclic prefix length
'Normal'
(default) | 'Extended'
Cyclic prefix length, specified as 'Normal'
or 'Extended'
. This field is optional.
Dependencies
This field applies only when you choose an LTE
configuration by specifying the NULRB
field.
Data Types: char
| string
NBULSubcarrierSpacing
— NB-IoT uplink subcarrier spacing
'3.75kHz'
| '15kHz'
NB-IoT uplink subcarrier spacing, specified as
'3.75kHz'
or '15kHz'
.
To set a subcarrier spacing of 3.75 kHz, specify
NBULSubcarrierSpacing
as
'3.75kHz'
. To set a subcarrier spacing of
15 kHz, specify NBULSubcarrierSpacing
as
'15kHz'
.
To return SC-FDMA modulation information for an NB-IoT configuration, you must specify this field. To indicate an LTE configuration, omit this field.
Note
For a subcarrier spacing of 3.75 kHz,
lteSCFDMAInfo
supports only
single-tone NB-IoT configurations.
Data Types: char
| string
Windowing
— Number of windowing samples
nonnegative integer
Number of time-domain samples over which the function applies windowing and overlapping of SC-FDMA symbols, specified as a nonnegative integer. This field is optional.
Note
If you do not specify this input, the
function
returns the Windowing
field of the info
output
as a default value chosen as a function of
NULRB
(for LTE configurations) or
NBULSubcarrierSpacing
(for NB-IoT
configurations). This behavior compromises between the
effective duration of the cyclic prefix (and therefore the
channel delay spread tolerance) and the spectral
characteristics of the transmitted signal (not considering
any additional FIR filtering).
For more information, see the lteSCFDMAModulate
function.
Data Types: double
Data Types: struct
Output Arguments
info
— Information related to SC-FDMA modulation
structure
Information related to SC-FDMA modulation, returned as a structure containing these fields.
NBULGapSamples
— Number of padded gap samples
positive integer
Number of padded gap samples at the end of each time slot, returned as a positive
integer. When the NBULSubcarrierSpacing
field is
'3.75kHz'
, NBULGapSamples
is
144
. Otherwise, NBULGapSamples
is
0
.
Dependencies
This argument is returned only when the
NBULSubcarrierSpacing
field of ue
is specified.
Data Types: double
CyclicPrefixLengths
— Cyclic prefix length
vector of positive integers
Cyclic prefix length, in number of time-domain samples, returned as a vector of
positive integers. Each entry represents the cyclic prefix length of the
corresponding orthogonal frequency-division multiplexing (OFDM) symbol in a time
slot. The function returns CyclicPrefixLengths
in accordance
with the specified input fields shown in these tables.
LTE Configuration
Nfft | CyclicPrefixLengths when
CyclicPrefixUL is set to
'Normal' | CyclicPrefixLengths when
CyclicPrefixUL is set to
'Extended' ) |
---|---|---|
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] |
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] |
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] |
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] |
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] |
NB-IoT Configuration
Nfft | NBULSubcarrierSpacing | CyclicPrefixLengths |
---|---|---|
128 | '15kHz' | [10 9 9 9 9 9 9 10 9 9 9 9 9 9] |
512 | '3.75kHz' | [16 16 16 16 16 16 16 16 16 16 16 16 16 16] |
Note
As shown in the tables, for values of Nfft
less than
2048, the entries of CyclicPrefixLengths
are given by
multiplying the cyclic prefix lengths when Nfft
is 2048 by
Nfft
/2048.
Data Types: int32
Windowing
— Number of time-domain samples
nonnegative integer
Number of time-domain samples over which the function applies windowing and overlapping of SC-FDMA symbols, returned as a nonnegative integer.
Data Types: double
Nfft
— Number of FFT points
positive integer
Number of FFT points, NFFT, returned as a positive integer.
Data Types: double
SamplingRate
— Sampling rate of time-domain waveform
positive scalar
Sampling rate of time-domain waveform, returned as a positive scalar. When the
NBULSubcarrierSpacing
field is '15kHz'
or unspecified, the sampling rate of the waveform is (30.72 MHz / 2048) ×
NFFT, where NFFT is the
number of fast Fourier transform (FFT) points. When you indicate an NB-IoT
configuration by specifying ue.NBULSubcarrierSpacing
, the
sampling rate is 1.92 MHz.
Data Types: double
Data Types: struct
Version History
Introduced in R2014a
See Also
lteSCFDMAModulate
| lteSCFDMADemodulate
| lteULResourceGridSize
| lteOFDMInfo
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