Equalizer coefficients for error vector magnitude measurement in new radio base station conformance testing
According to a first embodiment, a method may include calculating at least one moving average window size in a frequency domain associated with a channel bandwidth and adjusting the at least one moving average window size in the frequency domain for at least one demodulation reference signal subcarrier in at least one resource block where at least one gap having a size of at least a predefined size is between the at least one resource block. The at least one resource block comprises a predetermined number of demodulation reference signal subcarriers.
1. A method for supporting communication, comprising:
adjusting, by an apparatus, at least one moving average window size for demodulation reference signal, (DMRS) subcarriers in at least one resource block of a channel bandwidth; and
applying, by the apparatus, the adjusted at least one moving average window size to the DMRS subcarriers when the at least one resource block is at or beside an edge of the channel bandwidth,
wherein at least one of a first DMRS subcarrier, a second DMRS subcarrier or a third DMRS subcarrier of the DMRS subcarriers is averaged over 5 DMRS subcarriers if one of the adjusted at least one moving average window size is 5,
wherein at least one of a fourth DMRS subcarrier, a fifth DMRS subcarrier or a sixth DMRS subcarrier of the DMRS subcarriers is averaged over 5 DMRS subcarriers, if one of the adjusted at least one moving average window size is 5, and
wherein the at least one resource block comprises a predetermined number of DMRS subcarriers.
2. The method of claim 1 , wherein the predetermined number of DMRS subcarriers is six.
3. The method of claim 1 , wherein at least one of the first DMRS subcarrier, the second DMRS subcarrier or the third DMRS subcarrier of the DMRS subcarriers is averaged over 5 DMRS subcarriers from the first DMRS subcarrier to a fifth DMRS subcarrier of the DMRS subcarriers, and
wherein at least one of the fourth DMRS subcarrier, the fifth DMRS subcarrier or the sixth DMRS subcarrier of the DMRS subcarriers is averaged over 5 DMRS subcarriers from the second DMRS subcarrier to the sixth DMRS subcarrier of the DMRS subcarriers.
4. The method of claim 1 , further comprising:
calculating, by the apparatus, at least one coefficient for at least one non-DMRS subcarrier x according to a fifth order interpolation polynomial with six equalizer coefficients in at least one physical downlink shared channel resource block, wherein:
y
(
x
)
=
∑
j
=
1
6
y
j
∏
k
=
1
k
≠
j
6
x
-
x
k
x
j
-
x
k
.
5. The method of claim 1 further comprising:
calculating, by the apparatus, at least one coefficient for at least one non-DMRS subcarrier x according to a fourth order interpolation polynomial with five equalizer coefficients closest to a target non-demodulation reference signal subcarrier in the frequency domain in at least one physical downlink shared channel resource block, wherein:
y
(
x
)
=
∑
j
=
1
5
y
j
∏
k
=
1
k
≠
j
5
x
-
x
k
x
j
-
x
k
.
6. An apparatus, comprising:
at least one processor; and
at least one memory including instructions,
the at least one memory and the instructions configured to, with the at least one processor, cause the apparatus at least to:
adjust at least one moving average window size for demodulation reference signal, DMRS, subcarriers in at least one resource block of a channel bandwidth; and
apply the adjusted at least one moving average window size to the DMRS subcarriers when the at least one resource block is at or beside an edge of the channel bandwidth,
wherein at least one of a first DMRS subcarrier, a second DMRS subcarrier or a third DMRS subcarrier of the DMRS subcarriers is averaged over 5 DMRS subcarriers if one of the adjusted at least one moving average window size is 5,
wherein at least one of a fourth DMRS subcarrier, a fifth DMRS subcarrier or a sixth DMRS subcarrier of the DMRS subcarriers is averaged over 5 DMRS subcarriers, if one of the adjusted at least one moving average window size is 5, and
wherein the at least one resource block comprises a predetermined number of DMRS subcarriers.
7. The apparatus of claim 6 , wherein the predetermined number of DMRS subcarriers is six.
8. The apparatus of claim 6 , wherein at least one of the first DMRS subcarrier, the second DMRS subcarrier or the third DMRS subcarrier of the DMRS subcarriers is averaged over 5 DMRS subcarriers from the first DMRS subcarrier to a fifth DMRS subcarrier of the DMRS subcarriers, and
wherein at least one of the fourth DMRS subcarrier, the fifth DMRS subcarrier or the sixth DMRS subcarrier of the DMRS subcarriers is averaged over 5 DMRS subcarriers from the second DMRS subcarrier to the sixth DMRS subcarrier of the DMRS subcarriers.
9. The apparatus of claim 6 , wherein the at least one memory and the instructions configured to, with the at least one processor, further cause the apparatus to:
calculate at least one coefficient for at least one non-DMRS subcarrier x according to a fifth order interpolation polynomial with six equalizer coefficients in at least one physical downlink shared channel resource block, wherein:
y
(
x
)
=
∑
j
=
1
6
y
j
∏
k
=
1
k
≠
j
6
x
-
x
k
x
j
-
x
k
.
10. The apparatus of claim 6 , wherein the at least one memory and the instructions configured to, with the at least one processor, further cause the apparatus to:
calculate at least one coefficient for at least one non-DMRS subcarrier x according to a fourth order interpolation polynomial with five equalizer coefficients closest to a target non-DMRS subcarrier in the frequency domain in at least one physical downlink shared channel resource block, wherein:
y
(
x
)
=
∑
j
=
1
5
y
j
∏
k
=
1
k
≠
j
5
x
-
x
k
x
j
-
x
k
.
11. A non-transitory computer readable medium comprising instructions that, when executed by an apparatus, cause the apparatus to perform at least the following:
adjusting at least one moving average window size for demodulation reference signal, DMRS, subcarriers in at least one resource block of a channel bandwidth; and
applying the adjusted at least one moving average window size to the DMRS subcarriers when the at least one resource block is at or beside an edge of the channel bandwidth,
wherein at least one of a first DMRS subcarrier, a second DMRS subcarrier or a third DMRS subcarrier of the DMRS subcarriers is averaged over 5 DMRS subcarriers if one of the adjusted at least one moving average window size is 5,
wherein at least one of a fourth DMRS subcarrier, a fifth DMRS subcarrier or a sixth DMRS subcarrier of the DMRS subcarriers is averaged over 5 DMRS subcarriers, if one of the adjusted at least one moving average window size is 5, and
wherein the at least one resource block comprises a predetermined number of DMRS subcarriers.
12. The non-transitory computer readable medium of claim 11 , wherein the predetermined number of DMRS subcarriers is six.
13. The non-transitory computer readable medium of claim 11 , wherein at least one of the first DMRS subcarrier, the second DMRS subcarrier or the third DMRS subcarrier of the DMRS subcarriers is averaged over 5 DMRS subcarriers from the first DMRS subcarrier to a fifth DMRS subcarrier of the DMRS subcarriers, and
wherein at least one of the fourth DMRS subcarrier, the fifth DMRS subcarrier or the sixth DMRS subcarrier of the DMRS subcarriers is averaged over 5 DMRS subcarriers from the second DMRS subcarrier to the sixth DMRS subcarrier of the DMRS subcarriers.
14. The non-transitory computer readable medium of claim 11 , wherein the non-transitory computer readable medium further comprises instructions that, when executed by an apparatus, cause the apparatus to perform at least the following:
calculating at least one coefficient for at least one non-DMRS subcarrier x according to a fifth order interpolation polynomial with six equalizer coefficients in at least one physical downlink shared channel resource block, wherein:
y
(
x
)
=
∑
j
=
1
6
y
j
∏
k
=
1
k
≠
j
6
x
-
x
k
x
j
-
x
k
.
15. The non-transitory computer readable medium of claim 11 , wherein the non-transitory computer readable medium further comprises instructions that, when executed by an apparatus, cause the apparatus to perform at least the following:
calculating at least one coefficient for at least one non-DMRS subcarrier x according to a fourth order interpolation polynomial with five equalizer coefficients closest to a target non-demodulation reference signal subcarrier in the frequency domain in at least one physical downlink shared channel resource block, wherein:
y
(
x
)
=
∑
j
=
1
5
y
j
∏
k
=
1
k
≠
j
5
x
-
x
k
x
j
-
x
k
.