ltePUCCH1DRS
PUCCH format 1 demodulation reference signal
Description
Examples
Generate PUCCH Format 1 DM-RS
Generate PUCCH format 1 DM-RS values for UE-specific settings.
Initialize UE-specific and channel configuration structures. Generate PUCCH format 1 DM-RS values.
ue.NCellID = 1; ue.NSubframe = 0; ue.CyclicPrefixUL = 'Normal'; ue.Hopping = 'Off'; chs.ResourceIdx = 0; chs.DeltaShift = 1; chs.CyclicShifts = 0; drsSeq = ltePUCCH1DRS(ue,chs);
Generate PUCCH Format 1 DM-RS Using Virtual Cell ID
Demonstrate Uplink Release 11 coordinated multipoint (CoMP) operation. Intercell interference can be avoided by using a virtual cell identity and a distinct DM-RS cyclic shift hopping identity for a potentially interfering UE in a neighboring cell.
Configuration for UE of interest, UE 1 in cell 1.
ue1.NCellID = 1; ue1.NSubframe = 0; ue1.CyclicPrefixUL = 'Normal'; ue1.Hopping = 'Off'; chs1.ResourceIdx = 0; chs1.DeltaShift = 1; chs1.CyclicShifts = 0;
Configuration for interferer, UE 2 in cell 2.
ue2.NCellID = 2; ue2.NSubframe = 0; ue2.CyclicPrefixUL = 'Normal'; ue2.Hopping = 'Off'; chs2.ResourceIdx = 1; chs2.DeltaShift = 1; chs2.CyclicShifts = 0;
Measure the interference between the DM-RS signals.
interferenceNoCoMP = abs(sum(ltePUCCH1DRS(ue1,chs1).*conj(ltePUCCH1DRS(ue2,chs2))))
interferenceNoCoMP = 2.0706
Reconfigure interferer for CoMP operation: use virtual cell identity equal to the cell identity for the UE of interest.
ue2.NPUCCHID = ue1.NCellID;
Measure the interference between the DM-RS signals when using CoMP:
interferenceUsingCoMP = abs(sum(ltePUCCH1DRS(ue1,chs1).*conj(ltePUCCH1DRS(ue2,chs2))))
interferenceUsingCoMP = 2.3591e-14
Compare the correlations between the DM-RS signals for two UEs with and without CoMP, interferenceUsingCoMP
and interferenceNoCoMP
respectively. Using CoMP, the interference is reduced to effectively zero.
Generate PUCCH Format 1 DM-RS for Two Antennas
Generate the PUCCH format 1 DM-RS for two transmit antenna paths.
Initialize UE-specific and channel configuration structures. Generate PUCCH1 DM-RS and information outputs.
ue.NCellID = 1; ue.NSubframe = 0; ue.CyclicPrefixUL = 'Normal'; ue.Hopping = 'Off'; chs.ResourceIdx = [0 3]; chs.DeltaShift = 1; chs.CyclicShifts = 0; [drsSeq,info] = ltePUCCH1DRS(ue,chs);
Because there are two antennas, the DM-RS sequences are output as a two-column vector and the info
output structure contains two elements. View ind
and the size of info
to confirm this.
drsSeq(1:10,:)
ans = 10×2 complex
0.5000 + 0.5000i 0.5000 + 0.5000i
0.5000 + 0.5000i -0.5000 + 0.5000i
-0.5000 + 0.5000i 0.5000 - 0.5000i
-0.5000 + 0.5000i 0.5000 + 0.5000i
-0.5000 + 0.5000i -0.5000 + 0.5000i
0.5000 - 0.5000i 0.5000 + 0.5000i
0.5000 + 0.5000i -0.5000 - 0.5000i
-0.5000 - 0.5000i -0.5000 + 0.5000i
-0.5000 - 0.5000i -0.5000 - 0.5000i
0.5000 + 0.5000i -0.5000 + 0.5000i
size(info)
ans = 1×2
1 2
View the contents of the two info
structure elements.
info(1)
ans = struct with fields:
Alpha: [0 5.2360 4.1888 4.7124 1.0472 1.5708]
SeqGroup: [1 1]
SeqIdx: [0 0]
NResourceIdx: [0 2]
NCellCyclicShift: [192 46 212 91 84 25]
OrthSeqIdx: [0 0]
Symbols: [1.0000 + 0.0000i 1.0000 + 0.0000i 1.0000 + 0.0000i 1.0000 + 0.0000i 1.0000 + 0.0000i 1.0000 + 0.0000i]
OrthSeq: [3x2 double]
info(2)
ans = struct with fields:
Alpha: [1.5708 0.5236 5.7596 3.1416 5.7596 0]
SeqGroup: [1 1]
SeqIdx: [0 0]
NResourceIdx: [3 11]
NCellCyclicShift: [192 46 212 91 84 25]
OrthSeqIdx: [0 0]
Symbols: [1.0000 + 0.0000i 1.0000 + 0.0000i 1.0000 + 0.0000i 1.0000 + 0.0000i 1.0000 + 0.0000i 1.0000 + 0.0000i]
OrthSeq: [3x2 double]
Input Arguments
ue
— UE-specific settings
structure
UE-specific configuration settings, specified as a structure containing these fields.
Parameter Field | Required or Optional | Values | Description |
---|---|---|---|
NCellID | Required | Integer from 0 to 503 | Physical layer cell identity |
NSubframe | Required | 0 (default), nonnegative scalar integer | Subframe number |
CyclicPrefixUL | Optional |
| Cyclic prefix length |
Hopping | Optional |
| Frequency hopping method. |
NPUCCHID | Optional |
Integer from 0 to 503 | PUCCH virtual cell identity. If this field is not present, |
chs
— Channel transmission configuration
structure
PUCCH channel settings, specified as a structure containing the following fields.
Parameter Field | Required or Optional | Values | Description |
---|---|---|---|
ResourceIdx | Optional | 0 (default), integer from 0 to 2047 or vector of integers. | PUCCH resource indices, specified as an integer or a vector of integers. Values range from 0 to 2047. These indices determine the physical resource blocks, cyclic shift and orthogonal cover used for transmission. (). Define one index for each transmission antenna. |
DeltaShift | Optional | 1 (default), 2, 3 | Delta shift, specified as 1, 2, or 3. (Δshift) |
DeltaOffset | Optional | 0 (default), 1, 2 | (Δoffset). Warning: The use of this parameter field is not advised. It applies only to 3GPP releases preceding v8.5.0. This parameter will be removed in a future release. |
CyclicShifts | Optional | 0 (default), integer from 0 to 7 | Number of cyclic shifts used for format 1 in resource blocks (RBs) with a mixture of format 1 and format 2 PUCCH, specified as an integer from 0 to 7. () |
Output Arguments
seq
— PUCCH format 1 DRS values
numeric matrix
PUCCH format 1 DRS values, returned as a numeric matrix. The
symbols for each antenna are in the columns of seq
,
with the number of columns determined by the number of PUCCH resource
indices specified in chs
.
ResourceIdx
.
Example: [0.707+0.707i,...]
info
— PUCCH format 1 DRS information
structure array
PUCCH format 1 DRS information, returned as a structure array with elements corresponding to each transmit antenna and containing these fields.
Alpha
— Reference signal cyclic shift for each OFDM symbol
two-column vector
Reference signal cyclic shift for each OFDM symbol, returned as a two-column vector. (α)
SeqGroup
— PUCCH base sequence group number for each slot
two-column vector
PUCCH base sequence group number for each slot, returned as two-column vector. (u)
SeqIdx
— PUCCH base sequence number for each slot
two-column vector
PUCCH base sequence number for each slot, returned as two-column vector. (v)
NResourceIdx
— PUCCH resource indices for each slot
vector
PUCCH resource indices for each slot, returned as two-column vector. (n')
NCellCyclicShift
— Cell-specific cyclic shift for each OFDM symbol
vector
Cell-specific cyclic shift for each OFDM symbol, returned as vector. ()
OrthSeqIdx
— Orthogonal sequence index for each slot
two-column vector
Orthogonal sequence index for each slot, returned as two-column vector. ()
Symbols
— Modulated data symbols
vector
Modulated data symbols, returned as a vector. There is one element for each OFDM symbol. (z)
Example: [0.7071 + 0.7071i,...]
OrthSeq
— Orthogonal sequence for each slot
numeric matrix
Orthogonal sequence for each slot, returned as a numeric matrix. ()
Example: [1.000 + 1.000i,...]
Version History
Introduced in R2014a
See Also
ltePUCCH1
| ltePUCCH1Decode
| ltePUCCH1Indices
| ltePUCCH1DRSIndices
| ltePUCCH2DRS
| ltePUCCH3DRS
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