F.5 Window length

38.101-23GPPNRPart 2: Range 2 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 and Table F.5.3-2 below specify the EVM window length (W) for normal CP for FR2.

Table F.5.3-1: EVM window length for normal CP for 60 kHz SCS

Channel Bandwidth (MHz)

FFT size

Cyclic prefix length in FFT samples

EVM window length W

Ratio of W to total CP length 1 (%)

50

1024

72

36

50

100

2048

144

72

50

200

4096

288

144

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.

Table F.5.3-2: EVM window length for normal CP for 120 kHz SCS

Channel Bandwidth (MHz)

FFT size

Cyclic prefix length in FFT samples

EVM window length W

Ratio of W to total CP length 1 (%)

50

512

36

18

50

100

1024

72

36

50

200

2048

144

72

50

400

4096

288

144

50

Note 1: These percentages are informative and apply to all OFDM symbols within subframe except for symbol 0 of slot 0 and slot 4. Symbol 0 of slot 0 and slot 4 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 60 kHz SCS

Channel Bandwidth (MHz)

FFT size

Cyclic prefix length in FFT samples

EVM window length W

Ratio of W to total CP length1 (%)

50

1024

256

220

85.9

100

2048

512

440

85.9

200

4096

1024

880

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 LRA = 139 and where .

Table F.5.5-1: EVM window length for PRACH formats for LRA = 139

Preamble format

Cyclic prefix length

Nominal FFT size1

EVM window length W in FFT samples

Ratio of W to CP2

A1

11522–

81922–

5762–

50.0%

A2

23042–

81922–

17282–

75.0%

A3

34562–

81922–

28802–

83.3%

B1

8642–

81922–

2882–

33.3%

B2

14402–

81922–

8642–

60.0%

B3

20162–

81922–

14402–

71.4%

B4

37442–

81922–

31682–

84.6%

C0

49602–

81922–

43842–

88.4%

C2

81922–

81922–

76162–

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