Standard (802.16 OFDMA)

Default: IEEE Institute of Electrical and Electronics Engineers. A US-based membership organisation that includes engineers, scientists, and students in electronics and related fields. The IEEE developed the 802 series wired and wireless LAN standards. Visit the IEEE at http://www.ieee.org 802.16 OFDMA (See OFDMA Standard Presets Table.)

Standard specifies what 802.16 OFDMA standard profile is used to configure the VSA demodulator. The VSA provides a standard profile and a legacy profile. For standard profile configuration, select the "IEEE 802.16e OFDMA" Standard. For Legacy configuration, select "PIEEE 802.16 OFDMA (Cor1/D2)" Standard.

Standard Profile	Conformance Standard Specifications	Associated Preset to Standard
IEEE 802.16 OFDMA	IEEE Std 802.16-2009	WiBro, 802.16e: 5MHz, & 802.16e: 10MHz
PIEEE 802.16 OFDMA (Cor1/D2)	IEEE Std 802.16-2004, IEEE P802.16-2004/Cor1/-D2, IEEE P802.16e/D7	none

Standard Profile

Conformance Standard Specifications

Associated Preset to Standard

IEEE 802.16 OFDMA

IEEE Std 802.16-2009

WiBro, 802.16e: 5MHz, &

802.16e: 10MHz

PIEEE 802.16 OFDMA (Cor1/D2)

IEEE Std 802.16-2004,

IEEE P802.16-2004/Cor1/-D2,

IEEE P802.16e/D7

none

Preset to Standard: The Preset to Standard property auto-configures the VSA to demodulate and measure a particular OFDMA signal that conforms to a profile of the IEEE 802.16e OFDMA standard specification. Preset to Standard configures the Standard, Nominal Bandwidth, and Downlink Frame Ratio parameters to match the specified profile and will also reset all other OFDMA parameters to a default state, see "Using a Standard Setup ".

The Standard property only configures the demodulator and not the measurement configuration parameters. Use the Preset to Standard command button to automatically configure the demodulation parameters.

Standard and Legacy modes

Standard mode

In Standard mode, the 802..16 OFDMA modulation analysis is based on the July 2009 governing specifications. The default "IEEE 802.16e OFDMA" configuration is is based on the IEEE Std 802.16-2009 standard.

Legacy mode

The legacy IEEE 802.16 OFDMA standard implemented significant changes to the PRBS Pseudo-Random Binary Sequence definition and DL Down Link (forward link: from base station to cell phone)-PUSC partial usage of subchannels: Some of the subchannels are allocated to the transmitter. subchannel mapping definitions as defined in the P802.16-2004 Cor1/D3 specification. To measure legacy hardware, select the "PIEEE 802.16 OFDMA (Cor1/D2" Standard which is based on these legacy standards: IEEE P802.16e-D7, IEEE P802.16-2004 Cor1/D2, and IEEE Std 802.16-2004.

Leagacy Mode Measurement TIP

In legacy mode, the DL-PUSC subchannel mapping definition can be controlled with the "Use Cor1/D2 DL-PUSC cluster renumbering" property on the Advanced tab. "Clear" to measure signals with Cor1/D2 PRBS definition, and utilize Cor1/D3 DL-PUSC subchannel mapping definition.

The fundamental differences between the two standard revisions are the PRBS (Pseudo Random Bit Sequence) implementation, and the DL-PUSC subchannel mapping definition.

P802.16-2004 Cor1/D2 implements a PRBS algorithm which is incompatible with the adopted (IEEE Std 802.16e-2005) version. A PRBS implementation which does not match the specified standard revision may indicate the mismatched definition through the "PRBS Status" result presented on the Syms/Errs summary table. This will not affect EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format. results.
IEEE Std 802.16e-2005 clarified the definition of "cluster sorting" within a major group for DL-PUSC subchannel mapping. In P802.16e/D7, "cluster sorting" was defined to be using "physical cluster indices". In IEEE Std 802.16e-2005 this was changed to use "logical cluster indices". A mismatch of the signal’s implementation of this step with the selected standard will lead to mismatched subchannel mapping, and therefore invalid measurement results.