80211b Signal Source

Introduction

WLAN_80211b_SignalSource_prj design examples are described in this chapter.

• WLAN_80211_LowRate.dsn generates IEEE 802.11 burst with different data rates.
• WLAN_80211b_CCK.dsn generates IEEE 802.11b CCK burst with different data rates.
• WLAN_80211b_PBCC.dsn generates IEEE 802.11b PBCC burst with different data rates.

1 and 2 Mbps Signal Source

WLAN_80211_LowRate.dsn

Features

• 1 and 2 Mbps configurable signal source, adjustable data rate by setting Rate in VAR1
• Adjustable sample rate by setting OverSampling in VAR1

Description

This design is an example of IEEE 802.11 low rate signal source (1 Mbps and 2 Mbps) at various data rates with idle between two consecutive bursts; ramp bits are not appended to the data.

The top-level schematic for this design is shown in the following figure. Parameters that can be user-modified are contained in VAR1 User_Defined_Variables. Other parameters should be set according to the specification.

Note If the sample rate is changed, the parameter VRef used in model RF_ModFIR must be re-calibrated.

WLAN_80211_SignalSource.dsn Schematic

Simulation Results

Simulation results displayed in WLAN_80211_LowRate.dds are the RF waveform data (see the first of the following two figures) and the transmit spectrum (see the second figure).

RF Waveform Data of 802.11 Low Rate Signal Source

RF Transmit Spectrum of 802.11 Low Rate Signal Source

Benchmark

• Hardware platform: Pentium III 450 MHz, 512 MB memory
• Software platform: Windows NT 4.0 Workstation, ADS 2002
• Simulation time: approximately 1 minute

References

1. IEEE Standard 802.11b-1999, "Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Higher-speed Physical Layer Extension in the 2.4 GHz Band," 1999.

CCK Signal Source with Idle and Ramp Time

WLAN_80211b_CCK.dsn

Features

• 5.5 and 11 Mbps configurable signal source with CCK modulation, adjustable data rate by setting Rate in VAR1
• Adjustable sample rate by setting OverSampling in VAR1

Description

This design is an example of IEEE 802.11b CCK modulation signal source with long PLCP at various data rates; idle and ramp times are added between two consecutive bursts.

The top-level schematic for this design is shown in the following figure. Parameters that can be user-modified are contained in VAR1 User_Defined_Variables. Other parameters should be set according to the specification.

Note If the sample rate is changed, the parameter VRef used in model RF_ModFIR must be re-calibrated.

WLAN_80211b_CCK.dsn Schematic

Simulation Results

Simulation results displayed in WLAN_80211b_CCK.dds are the RF waveform data (see the first of the following two figures) and transmit spectrum (see the second figure).

RF Waveform data of 802.11b CCK modulation signal source

RF Transmit Spectrum of 802.11b CCK Modulation Signal Source

Benchmark

• Hardware platform: Pentium III 450 MHz, 512 MB memory
• Software platform: Windows NT 4.0 Workstation, ADS 2002
• Simulation time: approximately 1 minute

References

1. IEEE Standard 802.11b-1999, "Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Higher-speed Physical Layer Extension in the 2.4 GHz Band," 1999.

PBCC Signal Source with Idle and Ramp Time

WLAN_80211b_PBCC.dsn

Features

• 5.5 and 11 Mbps configurable signal source with PBCC modulation, adjustable data rate by setting Rate in VAR1
• Adjustable sample rate by setting OverSampling in VAR1

Description

This design is an example of IEEE 802.11b PBCC modulation signal source with long PLCP at various data rates; the idle and ramp times are added between two consecutive bursts.
The top-level schematic for this design is shown in the following figure. Parameters that can be user-modified are contained in VAR1 User_Defined_Variables. Other parameters should be set according to the specification.

Note If the sample rate is changed, the parameter VRef used in model RF_ModFIR must be re-calibrated.

WLAN_80211b_PBCC.dsn Schematic

Simulation Results

Simulation results displayed in WLAN_80211b_PBCC.dds are the RF waveform data (see the first of the following two figures) and transmit spectrum (see the second figure).

RF Waveform Data of 802.11b PBCC Modulation Signal Source

RF Transmit Spectrum of 802.11b PBCC Modulation Signal Source

Benchmark

• Hardware platform: Pentium III 450 MHz, 512 MB memory
• Software platform: Windows NT 4.0 Workstation, ADS 2002
• Simulation time: approximately 1 minute

References

1. IEEE Standard 802.11b-1999, "Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Higher-speed Physical Layer Extension in the 2.4 GHz Band," 1999.