## F.5 Window length

38.101-13GPPNRPart 1: Range 1 StandaloneRelease 17TSUser Equipment (UE) radio transmission and reception

## F.5.1 Timing offset

As a result of using a cyclic prefix, there is a range of, which, at least in the case of perfect Tx signal quality, would give close to minimum error vector magnitude. As a first order approximation, that range should be equal to the length of the cyclic prefix. Any time domain windowing or FIR pulse shaping applied by the transmitter reduces the range within which the error vector is close to its minimum.

## F.5.2 Window length

The window length *W* affects the measured EVM and is expressed as a function of the configured cyclic prefix length. In the case where equalization is present, as with frequency domain EVM computation, the effect of FIR is reduced. This is because the equalization can correct most of the linear distortion introduced by the FIR. However, the time domain windowing effect can’t be removed.

## F.5.3 Window length for normal CP

Table F.5.3-1, F.5.3-2, F.5.3-3 below specify the EVM window length (*W*) for normal CP.

Table F.5.3-1: EVM window length for normal CP for NR, FR1, 15 kHz SCS

Channel |
FFT size |
Cyclic prefix length for symbols 1‑6 and 8-13 in FFT samples |
EVM window length |
Ratio of |

5 |
512 |
36 |
18 |
50 |

10 |
1024 |
72 |
36 |
50 |

15 |
1536 |
108 |
54 |
50 |

20 |
2048 |
144 |
72 |
50 |

25 |
2048 |
144 |
72 |
50 |

30 |
3072 |
216 |
108 |
50 |

40 |
4096 |
288 |
144 |
50 |

50 |
4096 |
288 |
144 |
50 |

NOTE 1: These percentages are informative and apply to a slot’s symbols 1 to 6 and 8 to 13. Symbols 0 and 7 have a longer CP and therefore a lower percentage. |

Table F.5.3-2: EVM window length for normal CP for NR, FR1, 30 kHz SCS

Channel |
FFT size |
Cyclic prefix length for symbols 1‑13 in FFT samples |
EVM window length |
Ratio of |

5 |
256 |
18 |
9 |
50 |

10 |
512 |
36 |
18 |
50 |

15 |
768 |
54 |
27 |
50 |

20 |
1024 |
72 |
36 |
50 |

25 |
1024 |
72 |
36 |
50 |

30 |
1536 |
108 |
54 |
50 |

40 |
2048 |
144 |
72 |
50 |

50 |
2048 |
144 |
72 |
50 |

60 |
3072 |
216 |
108 |
50 |

70 |
3072 |
216 |
108 |
50 |

80 |
4096 |
288 |
144 |
50 |

90 |
4096 |
288 |
144 |
50 |

100 |
4096 |
288 |
144 |
50 |

NOTE 1: These percentages are informative and apply to a slot’s symbols 1 through 13. Symbol 0 has a longer CP and therefore a lower percentage. |

Table F.5.3-3: EVM window length for normal CP for NR (60 kHz SCS)

Channel |
FFT size |
Cyclic prefix length for symbols in FFT samples |
EVM window length |
Ratio of |

10 |
256 |
18 |
9 |
50 |

15 |
384 |
27 |
14 |
50 |

20 |
512 |
36 |
18 |
50 |

25 |
512 |
36 |
18 |
50 |

30 |
768 |
54 |
27 |
50 |

40 |
1024 |
72 |
36 |
50 |

50 |
1024 |
72 |
36 |
50 |

60 |
1536 |
108 |
54 |
50 |

70 |
1536 |
108 |
54 |
50 |

80 |
2048 |
144 |
72 |
50 |

90 |
2048 |
144 |
72 |
50 |

100 |
2048 |
144 |
72 |
50 |

NOTE 1: These percentages are informative and apply to all OFDM symbols within subframe except for symbol 0 of slot 0 and slot 2. Symbol 0 of slot 0 and slot 2 may have a longer CP and therefore a lower percentage. |

## F.5.4 Window length for Extended CP

Table F.5.4-1 below specifies the EVM window length (*W*) for extended CP. The number of CP samples excluded from the EVM window is the same as for normal CP length.

Table F.5.4-1: EVM window length for extended CP for NR, FR1, 60 kHz SCS

Channel |
FFT size |
Cyclic prefix length in FFT samples |
EVM window length |
Ratio of |

10 |
256 |
64 |
54 |
84.4 |

15 |
384 |
96 |
80 |
83.3 |

20 |
512 |
128 |
106 |
82.8 |

25 |
512 |
128 |
110 |
85.9 |

30 |
768 |
192 |
164 |
85.4 |

40 |
1024 |
256 |
220 |
85.9 |

50 |
1024 |
256 |
220 |
85.9 |

60 |
1536 |
384 |
330 |
85.9 |

70 |
1536 |
384 |
330 |
85.9 |

80 |
2048 |
512 |
440 |
85.9 |

90 |
2048 |
512 |
440 |
85.9 |

100 |
2048 |
512 |
440 |
85.9 |

NOTE 1: These percentages are informative. |

## F.5.5 Window length for PRACH

The table below specifies the EVM window length for PRACH preamble formats for *L _{RA}*= 839 and .

Table F.5.5-1 EVM window length for PRACH formats for * L _{RA}*= 839

Preamble format |
Cyclic prefix length |
Nominal FFT size |
EVM window length |
Ratio of |

0 |
3168 |
24576 |
2307 |
72.8% |

1 |
21024 |
24576 |
20163 |
95.9% |

2 |
4688 |
24576 |
3827 |
81.6% |

3 |
3168 |
6144 |
2952 |
93.2% |

NOTE 1: The use of other FFT sizes is possible as long as appropriate scaling of the window length is applied NOTE 2: These percentages are informative |

The table below specifies the EVM window length for PRACH preamble formats for * L _{RA}*= 139 and where.

Table F.5.5-2 EVM window length for PRACH formats for * L _{RA}*= 139

Preamble format |
Cyclic prefix length |
Nominal FFT size |
EVM window length |
Ratio of |

A1 |
2882 |
20482 |
1442 |
50.0% |

A2 |
5762 |
20482 |
4322 |
75.0% |

A3 |
8642 |
20482 |
7202 |
83.3% |

B1 |
2162 |
20482 |
722 |
33.3% |

B2 |
3602 |
20482 |
2162 |
60.0% |

B3 |
5042 |
20482 |
3602 |
71.4% |

B4 |
9362 |
20482 |
7922 |
84.6% |

C0 |
12402 |
20482 |
10962 |
88.4% |

C2 |
20482 |
20482 |
19042 |
93.0% |

NOTE 1: The use of other FFT sizes is possible as long as appropriate scaling of the window length is applied NOTE 2: These percentages are informative |