lteULChannelEstimateNPUSCH
Syntax
Description
[
estimates the channel between transmit and receive antennas for user equipment (UE) settings
hEst
,noiseEst
] = lteULChannelEstimateNPUSCH(ue
,chs
,rxGrid
)ue
, channel transmission configuration chs
, and
received resource grid rxGrid
. The function returns
hEst
, the estimated channel, and noiseEst
, the
estimated noise power spectral density.
The function calculates hEst
and noiseEst
by
averaging least-squares estimates of the narrowband physical uplink shared channel (NPUSCH)
demodulation reference signal (DRS) symbols over time and copying these symbols across the
allocated resource elements (REs) within the time-frequency grid.
Examples
Estimate Uplink Channel Characteristics
Perform NPUSCH channel estimation on a received resource grid.
Configure UE-specific settings.
ue = struct('NNCellID',0,'NBULSubcarrierSpacing','15kHz','NSlot',0);
Specify a channel transmission configuration.
chs = struct('NPUSCHFormat','Data','NRUsc',1,'NULSlots',16,'NRU',1, ... 'NRep',1,'NBULSubcarrierSet',0,'Modulation','QPSK');
Configure the channel estimation type and parameters.
cec = struct('FreqWindow',7,'TimeWindow',1,'InterpType','cubic','PilotAverage','UserDefined');
Generate the NPUSCH DRS symbols and allocate them to the appropriate locations on a resource grid.
grid = lteNBResourceGrid(ue); grid(lteNPUSCHDRSIndices(ue,chs)) = lteNPUSCHDRS(ue,chs);
Generate a waveform by performing single-carrier frequency-division multiple access (SC-FDMA) modulation on the NPUSCH DRS symbols.
waveform = lteSCFDMAModulate(ue,chs,grid);
Perform SC-FDMA demodulation, assuming that the received waveform matches the transmitted waveform.
rxGrid = lteSCFDMADemodulate(ue,chs,waveform);
Estimate the channel.
[hEst,noiseEst] = lteULChannelEstimateNPUSCH(ue,chs,cec,rxGrid);
Input Arguments
ue
— UE-specific settings
structure
UE-specific settings, specified as a structure containing these fields.
Field | Values | Description | Data Types |
---|---|---|---|
NBULSubcarrierSpacing | '3.75kHz' , '15kHz' | NB-IoT uplink subcarrier spacing To set a subcarrier
spacing of 3.75 kHz, specify this field as | char , string |
NNCellID | Integer in the interval [0, 503] | Narrowband physical layer cell identity (PCI) | double |
NFrame | 0 (default), nonnegative integer | Frame number | double |
NSlot | Nonnegative integer | Slot number When you specify the
| double |
Data Types: struct
chs
— Channel transmission configuration
structure
Channel transmission configuration, specified as a structure containing these fields.
Field | Values | Description | Data Types |
---|---|---|---|
NPUSCHFormat | 'Data' , 'Control' | NPUSCH format To indicate that the NPUSCH carries
narrowband uplink shared channel (UL-SCH) data, specify this field as
| char , string |
NRUsc | 1 , 3 , 6 ,
12 | Number of consecutive subcarriers in a resource unit (RU) If you specify the | double |
NRep | 1 , 2 , 4 ,
8 , 16 , 32 ,
64 , 128 | Number of repetitions for a codeword | double |
NRU | 1 , 2 , 3 ,
4 , 5 , 6 ,
8 , 10 | Number of RUs | double |
NULSlots | 2 , 4 , 8 ,
16 | Number of slots per RU If you specify the
If you
specify the
| double |
BaseSeqIdx | Integer in the interval [0, 29] Default depends on the value of the | Multitone NPUSCH DRS base sequence index
Dependencies.
To enable this field, specify the | double |
SeqGroupHopping | 'On' (default), 'Off' | To enable sequence-group hopping, specify this field as
'On' . To disable sequence group hopping, specify this
field as 'Off' . For more information, see section 5.5.1.3
of [1]. | char , string |
SeqGroup | 0 (default), integer in the interval [0, 29] | Sequence-group assignment for sequence shift pattern calculation For more information, see section 10.1.4.1.3 of [1]. Dependencies. To enable
this field, specify the | double |
CyclicShift | 0 (default), integer in the interval [0, 3] | Cyclic shift
Dependencies.
To enable this field, specify the | double |
NBULSubcarrierSet | Integer in the interval [0, 47], vector of integers in the interval [0, 11] | NB-IoT uplink subcarrier indices, in zero-based form If
you specify the If you specify the
If you specify
the | double |
Data Types: struct
rxGrid
— Received resource grid
complex-valued matrix
Received resource grid, specified as a complex-valued matrix of size T-by-P.
T is the number of time-domain samples.
P is the number of transmit antennas.
You can generate this input by performing SC-FDMA demodulation on a received
resource grid using the lteSCFDMADemodulate
function.
Data Types: double
Complex Number Support: Yes
cec
— Channel estimation configuration
structure
Channel estimation configuration, specified as a structure containing these fields.
Field | Values | Description | Data Types |
---|---|---|---|
FreqWindow | Positive odd integer, positive multiple of 12 | Size of window for frequency averaging, in resource elements | double |
TimeWindow | Positive odd integer | Size of window for time averaging, in resource elements | double |
InterpType | 'nearest' , 'linear' ,
'natural' , 'cubic' ,
'v4' , 'none' | Type of interpolation between pilot symbols, specified as one of these values.
For more information, see the | char , string |
PilotAverage | 'TestEVM' , 'UserDefined' | Type of pilot averaging If you specify this field as
When you specify this
field as | char , string |
Data Types: struct
stateIn
— Encoder state
struct()
(default) | structure
Encoder state for NPUSCH DRS generation, specified as a structure. This input
corresponds to the stateIn
input of the lteNPUSCHDRS
function. This
input contains the internal state of each transport block in these fields.
Field | Values | Description | Data Types |
---|---|---|---|
SlotIdx | Integer in the interval [0, (chs.NRU ×
chs.NULSlots × chs.NRep ) –
1] | Index of a slot within a bundle, in zero-based form | double |
InitNSlot | Nonnegative integer | Slot number for scrambling sequence initialization | double |
InitNFrame | Nonnegative integer | Frame number for scrambling sequence initialization | double |
EndOfBlk | Logical 1 (true ) or
0 (false ) | To indicate that the transmission has reached the end of a transport
block, specify this field as 1 (true ).
Otherwise, specify this field as 0
(false ). | logical |
EndOfTx | Logical 1 (true ) or
0 (false ) | To indicate that the transmission has reached the end of a bundle,
specify this field as 1 (true ).
Otherwise, specify this field as 0
(false ). | logical |
GhpNSlot | Nonnegative integer | Slot number for the first slot in the RU Dependencies. To enable this field, specify the
| double |
Data Types: struct
Output Arguments
hEst
— Channel estimate
complex-valued array
Channel estimate, returned as a complex-valued array of size K-by-L-by-R.
K is the total number of subcarriers.
L is the number of SC-FDMA symbols.
R is the number of receive antennas.
Data Types: double
Complex Number Support: Yes
noiseEst
— Noise power spectral density
real-valued scalar
Noise power spectral density, returned as a real-valued scalar. This output represents the power spectral density of the noise present on the estimated channel response coefficients.
Data Types: double
References
[1] 3GPP TS 36.211. “Physical channels and modulation.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA). https://www.3gpp.org.
[2] 3GPP TS 36.101. “Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio transmission and reception.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. https://www.3gpp.org.
Version History
Introduced in R2020a
See Also
Functions
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