Go to description Go to description Go to description Go to description Go to description Go to description Go to description Go to description Go to description Go to description Go to description Go to description Go to description Go to description Go to description Go to description Go to description Go to description Go to description Go to description

802.15.4 SUN O-QPSK Setup

Click 802.15.4 SUN O-QPSK in the tree view to display the 802.15.4 SUN O-QPSK setup.

1. General Settings

Frequency Band

Choice: 470 MHz | 780 MHz | 866 MHz | 867 MHz | 868 MHz | 870 MHz | 915 MHz | 915-a MHz | 915-b MHz | 915-c MHz | 915-d MHz | 915-e MHz | 917 MHz | 919 MHz | 920 MHz | 920-a MHz | 920-b MHz | 2450 MHz

Default: 470 MHz

Coupling: Spreading Mode and Chip Rate

Select the frequency band for 802.15.4 SUN OQPSK PHY. See Table 21-2 in std 802.15.4-2020. It is not coupled with the Frequency under Instrument node, please set a proper center frequency for the signal after selecting the band.

Spreading Mode

Choice: DSSS | MDSSS

Default: DSSS

Coupling: DSSS is supported for all frequency bands, and MDSSS is supported only for780 MHz, 915 MHz, 915 MHz-a, 915 MHz-b, 915 MHz-c, 917 MHz, and 2450 MHz frequency bands

Select the spreading mode for 802.15.4 SUN OQPSK PHY.

Rate Mode

Range: 0 | 1 | 2 | 3

Default: 0

Coupling: none

Select the rate mode for 802.15.4 SUN OQPSK PHY.

Chip Rate

Choice: 100 kchip/s | 1000 kchip/s | 2000 kchip/s (depends on frequency band and spreading mode)

Default: 100 kchip/s

Coupling: Read-only on frequency bands except 780 MHz, 915 MHz, 915 MHz-a, 915 MHz-b, 915 MHz-c, 917 MHz frequency bands; its value depends on Frequency Band and Spreading Mode when it’s read-only

Select the chip rate for 802.15.4 SUN OQPSK PHY.

Data Rate

Range: none

Default: 6.25 kb/s

Coupling: Read-only and its value depends on Spreading Mode, Rate Mode and Chip Rate

Display the data rate for 802.15.4 SUN OQPSK PHY.

Idle Interval (us)

Range: 0 to 200000 us

Default: 100 us

Coupling: none

Set the idle interval in-between frames in micro seconds. When idle interval is set to zero, a continuous waveform will be generated.

2. PPDU Settings

Preamble (Hex)

Choice: 00000000000000 | 00000000

Default: 00000000 (Hex)

Coupling: The preamble sequence is "00000000000000" for780 MHz, 915 MHz, 915 MHz-a, 915 MHz-b, 915 MHz-c, 917 MHz, and 2450 MHz frequency bands and "00000000" for other frequency bands

Display the preamble for 802.15.4 SUN OQPSK PHY.

SFD (Hex)

Choice: D746 (Hex)

Default: D746 (Hex)

Coupling: Read-only and it is fixed to be "D746 (Hex)"

Display the SFD field of PPDU in hex.

PHR (Hex)

Range: none

Default: 00C497 (Hex)

Coupling: Read-only and it is automatically updated with PSDU settings

Display the PHR field of PPDU in hex.

PSDU

MAC Header

Range: none

Default: 8821,01,1234,5678,4321,8765

Coupling: none

Click the button on the right to bring up an editor to configure the MAC Header.

Data Type

Choice: PN9 | PN15 | Coutom Bit Pattern | User File

Default: PN9

Coupling: none

Set payload data type.

Maximum Data Length (Octets)

Range: 127

Default: 127

Coupling: none

Set the maximum data length of the payload field.

Data Length (Octets)

Range: 0 to 127

Default: 20

Coupling: none

Enter the length of payload in octets. Use space to split different length between different frame, the number of space separated values should be less than or equal to the number of frames.

Data Mode

Choice: Continous | Truncated

Default: Continous

Coupling: none

Select the data mode. Continuous mode will have data bits continuously distributed across multi-frame. Truncated mode will have the same payload data bits for all the frames, with the data size truncated for one frame.

MAC FCS

Choice: On | Off

Default: On

Coupling: none

Enable or disable MAC FCS in the PSDU. When turned off, it can be used to simulate an invalid FCS case, since FCS part is actually filled with user data bits. See Figure 35 in IEEE Std 802.15.4-2011 for details.

3. Impairments

Symbol Timing Error

Range: -300 to 300 ppm

Default: 0

Coupling: none

Set the symbol timing error of HRP UWB signal. The uint is ppm.

Frequency Offset

Range: -200 to 200 kHz

Default: 0

Coupling: none

Set the frequency offset of HRP UWB signal.

802.15.4 SUN O-QPSK Concepts