Motorola Orthus Manual - Page 11

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2.6.7

Modulation accuracy (EVM), OFDM rates

The following table lists the EVM requirements for OFDM data rates which use 802.11a, 802.11g, and 802.11n

draft 2.0 waveforms:

Modulation

BPSK

QPSK

16-QAM

64-QAM

2.6.8

Phase noise

Normally, the phase noise effect has already part of the transmit EVM specifications. However, the receiver local

oscillator can still affect the receive signal quality.

2.6.9

VCO turn around settling time

The VCO shape should be similar to the plot below or better for backward compatibility with older Motorola

products. Specifically, during transient transition from transmit to receive, or from receive to transmit, the VCO

frequency shall not change more than 20 KHz over 20us counting from the start of the turnaround packet.

5.5

Figure 9- Transmit modulation accuracy (EVM) for DSSS rates

Data rate(Mbps)

Relative constellation error (dB) (minimum)

Figure 10-EVM specifications for OFDM 802.11 a/g rates

Code rate

Relative constellation error (dB) (minimum)

5/6

Figure 11-Transmit modulation accuracy (EVM) for HT rates

Item

Integrated phase noise

Figure 12-Phase noise specification

For Internal Use Only - Do Not Duplicate

CONFIDENTIAL AND PROPRIETARY

35%

-5

-8

-10

-13

-16

-19

-22

-25

-5

-10

-13

-16

-19

-22

-25

-28

Max

Unit

1.5

Degree rms