nrSRSConfig
Description
The nrSRSConfig
object sets sounding reference signal (SRS)
configuration parameters, as defined in TS 38.211 Section 6.4.1.4 [1].
The default nrSRSConfig
object specifies a single-port, single-symbol,
narrowband configuration without frequency hopping and places the SRS at the end of the
slot.
Creation
Description
srs = nrSRSConfig
creates an SRS configuration object with
default properties.
srs = nrSRSConfig(
specifies
properties using one or more name-value pair arguments. Enclose each property in quotes.
For example, Name,Value
)'NumSRSPorts',2,'NumSRSSymbols',4
specifies a two-port SRS
transmission of 4 OFDM symbols. Unspecified properties take their default values.
Properties
Configurable SRS Properties
NumSRSPorts
— Number of SRS antenna ports
1
(default) | 2
| 4
| 8
(since R2024a)
Number of SRS antenna ports, specified as 1
, 2
,
4
, or 8
.
Data Types: double
SymbolStart
— 0-based index of first OFDM symbol
13
(default) | integer from 0 to 13
0-based index of first OFDM symbol in the SRS within a slot, specified as one of these options:
Integer from 0 to 13 — Use this option for normal cyclic prefix.
Integer from 0 to 11 — Use this option for extended cyclic prefix.
For the SRS symbols and index generation, set the cyclic prefix of the
carrier by using the CyclicPrefix
property of the
nrCarrierConfig
object.
Data Types: double
NumSRSSymbols
— Number of OFDM symbols allocated to the SRS
1
(default) | 2
| 4
| 8
| 10
| 12
| 14
Number of OFDM symbols allocated to the SRS in a slot, specified as
1
, 2
, 4
,
8
, 10
, 12
, or
14
. Property values 10
and
14
are only valid when you set the SRSPositioning
property to 0
(false
).
When you set the SRSPositioning
property to 1
(true
), to display valid configurations of this property and the
KTC
property, use the SubcarrierOffsetTable
property.
Data Types: double
ResourceType
— Time-domain behavior
'periodic'
(default) | 'semi-persistent'
| 'aperiodic'
Time-domain behavior of the SRS, specified as 'periodic'
,
'semi-persistent'
, or 'aperiodic'
. Downlink
control information (DCI) triggers aperiodic SRS transmissions. When the resource type
is aperiodic, the SRSPeriod
property determines the periodicity and offset of the
DCI-triggering signal. An aperiodic resource type also disables interslot frequency
hopping.
Data Types: char
| string
SRSPeriod
— Slot periodicity and offset
'on'
(default) | 'off'
| [TSRS
Toffset]
Slot periodicity and offset, specified as one of these values:
'on'
— The SRS is present in all slots.'off'
— The SRS is absent in all slots.[TSRS Toffset] — The presence of the SRS in a given slot depends on the specified slot periodicity, TSRS, and the offset, Toffset, based on TS 38.211 Section 6.4.1.4.4. Specify TSRS as
1
,2
,4
,5
,8
,10
,16
,20
,32
,40
,64
,80
,160
,320
,640
,1280
, or2560
. Specify Toffset as a nonnegative integer such that Toffset < TSRS.
The SRSPeriod
values [1 0]
and
'on'
are equivalent.
Data Types: char
| string
| double
FrequencyStart
— Frequency-domain offset
0
(default) | integer from 0 to 271
Frequency-domain offset of the SRS, in terms of a physical resource block (PRB) index relative to the carrier, specified as an integer from 0 to 271. FrequencyStart
is analogous to parameter from TS 38.211 Section 6.4.1.4.3.
This property, the additional circular frequency-domain offset property NRRC
, and the bandwidth configuration parameters in TS 38.211 Table 6.4.1.4.3-1 determine the actual frequency-domain location of the SRS. For more information, see NR SRS Configuration.
Data Types: double
NRRC
— Additional circular frequency-domain offset
0
(default) | integer from 0 to 67
Additional circular frequency-domain offset of the SRS, as a multiple of 4 PRBs, specified as an integer from 0 to 67.
This property, the frequency domain offset property FrequencyStart
, and the bandwidth configuration parameters in TS 38.211 Table 6.4.1.4.3-1 determine the actual frequency-domain location of the SRS. For more information, see NR SRS Configuration.
Data Types: double
CSRS
— Row index of bandwidth configuration table
0
(default) | integer from 0 to 63
Row index of the bandwidth configuration table from TS 38.211 Table 6.4.1.4.3-1, specified as
an integer from 0 to 63. Use this property with the BSRS
property
to control the bandwidth allocated to the SRS and the frequency hopping pattern.
Increasing the CSRS
value increases the SRS bandwidth. The default
value of 0
results in a bandwidth of 4 PRBs.
Data Types: double
BSRS
— Column index of bandwidth configuration table
0
(default) | integer from 0 to 3
Column index of the bandwidth configuration table from TS 38.211 Table 6.4.1.4.3-1, specified
as an integer from 0 to 3. Use this property with the CSRS
property
to control the bandwidth allocated to the SRS and the frequency hopping pattern.
Increasing the BSRS
value decreases the SRS bandwidth.
Data Types: double
BHop
— Frequency hopping index
0
(default) | integer from 0 to 3
Frequency hopping index, specified as an integer from 0 to 3. Setting this property to a value
greater than or equal to the column index of the bandwidth configuration table property,
BSRS
, disables frequency hopping. Increasing the
BHop
value decreases the hopping bandwidth.
Data Types: double
Repetition
— Repetition factor of OFDM symbols
1
(default) | 2
| 4
| 5
| 6
| 7
| 8
| 10
| 12
| 14
Repetition factor of OFDM symbols, specified as 1
,
2
, 4
, 5
,
6
, 7
, 8
,
10
, 12
, or 14
.
When frequency hopping is enabled,
Repetition
specifies the number of consecutive OFDM symbols in a slot occupied by the SRS in the same frequency resource. SetRepetition
such thatRepetition
≤NumSRSSymbols
.When frequency hopping is disabled, this property is ignored.
Data Types: double
KTC
— Transmission comb number
2
(default) | 4
| 8
Transmission comb number, in subcarriers, specified as 2
,
4
, or 8
. This property specifies the minimum
frequency separation between two subcarriers that allocate SRS.
When you set the SRSPositioning
property to 1
(true
), to display valid configurations of this property and the
NumSRSSymbols
property, use the SubcarrierOffsetTable
property.
Data Types: double
KBarTC
— Transmission comb offset
0
(default) | integer from 0 to (KTC
– 1)
Transmission comb offset, in subcarriers, specified as an integer from 0 to
(KTC
– 1). This property specifies a frequency offset within the
comb.
Data Types: double
FrequencyScalingFactor
— Frequency scaling factor
1
(default) | 2
| 4
Frequency scaling factor, specified as 1
, 2
, or
4
. Use this property to reduce the SRS transmission bandwidth for
partial frequency sounding. This property corresponds to the parameter
PF in Release 17 of TS 38.211 Section
6.4.1.4.3. The default value 1
disables frequency scaling.
Data Types: double
StartRBIndex
— Partial frequency sounding block index
0
(default) | nonnegative integer
Partial frequency sounding block index, specified as a nonnegative integer in the
range [0, FrequencyScalingFactor
–1].
Use this property to control the SRS frequency position when you set the
FrequencyScalingFactor
property to 2
or
4
.
Data Types: double
EnableStartRBHopping
— Enable frequency hopping of first RB
0
or false
(default) | 1
or true
Enable frequency hopping of the first RB in the SRS transmission for partial frequency sounding, specified as one of these logical values.
0
(false
) — Disable frequency hopping of the first RB.1
(true
) — Enable frequency hopping of the first RB.
Use this property to control the frequency hopping of the first RB when you set
the FrequencyScalingFactor
property to 2
or
4
.
Data Types: logical
| double
CyclicShift
— Cyclic shift offset
0
(default) | integer from 0 to 11
Cyclic shift offset, specified as an integer from 0 to 11. This property determines the cyclic shift applied to the SRS sequence for each antenna port. This property corresponds to parameter in TS 38.211 Section 6.4.1.4.2.
Set the cyclic shift offset in relation to the transmission comb property, KTC
:
If you set
KTC
to2
, setCyclicShift
to an integer from 0 to 7.If you set
KTC
to4
, setCyclicShift
to an integer from 0 to 11.If you set
KTC
to8
, setCyclicShift
to an integer from 0 to 5.
For multiport SRS transmissions, consecutive cyclic shift numbers are used for each port, modulo 6, 8, or 12, depending on the KTC
property.
Data Types: double
GroupSeqHopping
— Type of SRS symbol hopping
'neither'
(default) | 'groupHopping'
| 'sequenceHopping'
Type of SRS symbol hopping, specified as 'neither'
, 'groupHopping'
, or 'sequenceHopping'
. When either group or sequence hopping is enabled, the group or sequence hopping numbers per OFDM symbol in the SRS transmission are based on a pseudo-random binary sequence (PRBS). Set the scrambling identity for the PRBS by using the NSRSID
property.
Data Types: char
| string
NSRSID
— SRS scrambling identity
0
(default) | integer from 0 to 65,535
SRS scrambling identity, specified as an integer from 0 to 65,535.
When you set the
GroupSeqHopping
property to'neither'
, this property determines the group number.When you set the
GroupSeqHopping
property to'groupHopping'
or'sequenceHopping'
, this property initializes the PRBS.
Data Types: double
SRSPositioning
— SRS for user positioning
0
or false
(default) | 1
or true
SRS for user positioning, as defined in Release 16 of TS 38.211 Section 6.4.1.4, specified as one of these values.
0
(false
) — Disable SRS for user positioning. This option corresponds to the higher-layer parameter SRS-Resource.1
(true
) — Enable SRS for user positioning. This option corresponds to the higher-layer parameter SRS-PosResource-r16.
This property affects the valid range of the NumSRSSymbols
and
KTC
properties.
Data Types: logical
| double
EnableEightPortTDM
— Eight-port TDM
0
or false
(default) | 1
or true
Since R2024a
Eight-port time division multiplexing (TDM), specified as one of these logical values:
0
(false
) — Disable eight-port TDM in the SRS transmission.1
(true
) — Enable eight-port TDM in the SRS transmission. This option corresponds to a configuration in which the higher-layer parameter nrofSRS-Ports-n8 is set to ports8tdm.
Dependencies
To enable this property, set the NumSRSPorts
property to
8
.
Data Types: logical
| double
CyclicShiftHopping
— Cyclic shift hopping
0
or false
(default) | 1
or true
Since R2024a
Cyclic shift hopping, specified as one of these logical values:
0
(false
) — Disable cyclic shift hopping in the SRS transmission.1
(true
) — Enable cyclic shift hopping in the SRS transmission. This option corresponds to a configuration in which the higher-layer parameter cyclicShiftHopping is present.
Data Types: logical
| double
CyclicShiftHoppingID
— Cyclic shift hopping ID
0
(default) | nonnegative integer
Since R2024a
Cyclic shift hopping ID, specified as a nonnegative integer. This property initializes the pseudorandom binary sequence (PRBS) that defines the cyclic shift hopping pattern.
Dependencies
To enable this property, set the CyclicShiftHopping
property
to true
.
Data Types: double
CyclicShiftHoppingSubset
— Cyclic shift hopping subset
[]
(default) | vector of nonnegative integers
Since R2024a
Cyclic shift hopping subset, specified as a vector of nonnegative integers. This
property corresponds to the higher-layer parameter
cyclicShiftHoppingSubset and specifies the set of cyclic shifts
for hopping in the SRS transmission. The PRBS that you initialize with the
CyclicShiftHoppingID
property determines the order of the
cyclic shifts in the hopping pattern. The default value, []
, implies
that the object automatically selects the {0, 1, ...,
K⨯NCSmax – 1} set. NCSmax
is the maximum number of cyclic shifts, as defined in TS 38.211 Table 6.4.1.4.2-1.
K = 1 by default. To enable finer granularity, set the
HoppingFinerGranularity
property to true
, in
which case K = 2.
Dependencies
To enable this property, set the CyclicShiftHopping
property
to true
.
Data Types: double
HoppingFinerGranularity
— Finer granularity for cyclic shift hopping
0
or false
(default) | 1
or true
Since R2024a
Finer granularity for cyclic shift hopping, specified as one of these logical values:
0
(false
) — Disable finer granularity for cyclic shift hopping in the SRS transmission.1
(true
) — Enable finer granularity for cyclic shift hopping in the SRS transmission. This option corresponds to a configuration in which the higher-layer parameter hoppingFinerGranularity is present.
This property determines the value of the K parameter
in the default cyclic shift hopping subset that the object automatically selects when
you set the CyclicShiftHoppingSubset
property to
[]
.
Dependencies
To enable this property, set the CyclicShiftHopping
property
to true
.
Data Types: double
| logical
CombOffsetHopping
— Comb offset hopping
0
or false
(default) | 1
or true
Since R2024a
Comb offset hopping, specified as one of these logical values:
0
(false
) — Disable comb offset hopping in the SRS transmission.1
(true
) — Enable comb offset hopping in the SRS transmission. This option corresponds to a configuration in which the higher-layer parameter combOffsetHopping is present.
Data Types: double
| logical
CombOffsetHoppingID
— Comb offset hopping ID
0
(default) | nonnegative integer
Since R2024a
Comb offset hopping ID, specified as a nonnegative integer. This property initializes the PRBS that defines the comb offset hopping pattern.
Dependencies
To enable this property, set the CombOffsetHopping
property
to true
.
Data Types: double
CombOffsetHoppingSubset
— Comb offset hopping subset
[]
(default) | matrix of nonnegative integers
Since R2024a
Comb offset hopping subset, specified as a matrix of nonnegative integers. This property
corresponds to the higher-layer parameter
combOffsetHoppingSubset and
specifies the set of comb offsets for hopping in the SRS
transmission. The PRBS that you initialize with the
CombOffsetHoppingID
property
determines the order of the comb offsets in the hopping pattern.
The default value, []
, implies that the
object automatically selects the
{0,1,...,KTC
– 1} set, which
depends on the transmission comb number property value.
Dependencies
To enable this property, set the
CombOffsetHopping
property to
true
.
Data Types: double
HoppingWithRepetition
— Comb offset hopping with repetition
0
or false
(default) | 1
or true
Since R2024a
Comb offset hopping with repetition, specified as one of these logical values:
0
(false
) — Disable time repetition for the comb offset hopping in the SRS transmission.1
(true
) — Enable time repetition for the comb offset hopping in the SRS transmission. The repetition factor of the OFDM symbols, specified by theRepetition
property, determines the minimum number of symbols for which the comb offset remains constant. This option corresponds to a configuration in which the higher-layer parameter hoppingWithRepetition is present.
Dependencies
To enable this property, set the CombOffsetHopping
property
to true
.
Data Types: double
| logical
Nonconfigurable SRS Properties
The object automatically sets these properties based on configurable SRS property values by using the configuration tables from TS 38.211 Section 6.4.1.4.
NRB
— Number of RBs allocated for SRS transmission
4
(default) | positive integer
This property is read-only.
Number of RBs allocated for SRS transmission, returned as a positive integer. When frequency hopping is enabled, this property denotes the hopping bandwidth or number of RBs over which the SRS signal hops across multiple time slots.
Data Types: double
NRBPerTransmission
— Number of RBs allocated per SRS OFDM symbol
4
(default) | positive integer
This property is read-only.
Number of RBs allocated per SRS OFDM symbol, returned as a positive integer. When
frequency hopping is enabled, this property specifies the allocated bandwidth at each
SRS OFDM symbol. When frequency hopping is disabled, this property is equal to the
NRB
property.
Data Types: double
SRS Lookup Tables
BandwidthConfigurationTable
— SRS bandwidth configuration
constant 64-by-9 table (default)
This property is read-only.
SRS bandwidth configuration, as defined in TS 38.211 Table 6.4.1.4.3-1, returned
as a constant 64-by-9 table. To display this table, type
nrSRSConfig.BandwidthConfigurationTable
at the command
line.
SubcarrierOffsetTable
— Subcarrier offset configuration
constant 3-by-6 table (default)
This property is read-only.
Subcarrier offset configuration, as defined in TS 38.211 Table 6.4.1.4.3-2,
returned as a constant 3-by-6 table. Use this property to determine the SRS subcarrier
offset for each OFDM symbol and to obtain valid combinations of the number of OFDM
symbols and the transmission comb number. To display this table, type
nrSRSConfig.SubcarrierOffsetTable
at the command line.
StartRBHoppingTable
— Frequency hopping offset indices
constant 4-by-4 table (default)
This property is read-only.
Frequency hopping offset indices for partial frequency sounding, as defined in TS
38.211 Table 6.4.1.4.3-3, returned as a constant 4-by-4 table. To display this table,
type nrSRSConfig.StartRBHoppingTable
at the command line.
Examples
Generate and Map SRS Symbols to Carrier Grid
Configure the SRS and the carrier with default configuration parameters.
carrier = nrCarrierConfig; srs = nrSRSConfig;
Generate SRS symbols and indices using the specified carrier and SRS configuration parameters.
srsSym = nrSRS(carrier,srs); srsInd = nrSRSIndices(carrier,srs);
Create a carrier grid corresponding to the number of subcarriers, OFDM symbols, and number of antenna ports specified in the configuration objects.
K = carrier.NSizeGrid*12; % Number of subcarriers L = carrier.SymbolsPerSlot; % Number of OFDM symbols per slot P = srs.NumSRSPorts; % Number of antenna ports gridSize = [K L P];
Initialize the carrier grid for one slot with all zeros.
slotGrid = complex(zeros(gridSize));
Map the SRS symbols to the carrier grid using the indices.
slotGrid(srsInd) = srsSym;
Generate SRS Symbols for Two-Port Transmission
Configure the carrier with default configuration parameters.
carrier = nrCarrierConfig;
Configure a two-port SRS transmission of 4 OFDM symbols.
srs = nrSRSConfig; srs.NumSRSPorts = 2; srs.NumSRSSymbols = 4;
The SRS must be located in the last six symbols of the slot. Set the time-domain starting position of the SRS to 8
and the bandwidth configuration index to 5
.
srs.SymbolStart = 8; srs.CSRS = 5;
Generate SRS symbols for the specified carrier and SRS configuration parameters.
[sym,info] = nrSRS(carrier,srs);
Verify that the symbols vector contains two columns corresponding to the two-port transmission.
size(sym)
ans = 1×2
480 2
Verify the number of SRS symbols per port.
isequal(info.SeqLength*srs.NumSRSSymbols,size(sym,1))
ans = logical
1
References
[1] 3GPP TS 38.211. “NR; Physical channels and modulation.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network.
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.
Version History
Introduced in R2020aR2024a: Specify eight antenna ports and enable cyclic shift and comb offset hopping
The object enables you to:
Specify eight antenna ports through the
NumSRSPorts
property.Specify eight-port TDM for SRS transmission through the
EnableEightPortTDM
property.Configure cyclic shift hopping and comb offset hopping in SRS transmissions through the
CyclicShiftHopping
,CyclicShiftHoppingID
,CyclicShiftHoppingSubset
,HoppingFinerGranularity
,CombOffsetHopping
,CombOffsetHoppingID
,CombOffsetHoppingSubset
, andHoppingWithRepetition
properties.
R2023a: Release 17 updates for partial frequency sounding SRS transmissions
The object now supports SRS for partial frequency sounding, as defined in Release 17 of TS 38.211 Section 6.4.1.4.
Use the
FrequencyScalingFactor
,StartRBIndex
, andEnableStartRBHopping
object properties to configure SRS transmissions for partial frequency sounding.Use the
StartRBHoppingTable
read-only object property to display the frequency hopping offset indices for partial frequency sounding, as defined in TS 38.211 Table 6.4.1.4.3-3.The properties
NumSRSSymbols
,Repetition
,KTC
, andKBarTC
now support the extended ranges that are defined in Release 17.
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