Yet, filtering is implied in the spectrum mask. The IEEE 802.11 standards do not specify a transmit modulation filter function. (See the figure for an example measurement.) View larger image. All offset results are also the peak PSD in that offset, as opposed to the integrated power. For WLAN, the reference power is taken as the peak PSD in the signal. It may be expressed as a ratio of power spectral densities (PSD) between the carrier and the specified offset frequency band. The transmit spectrum mask measurement includes the in-band and out-of-band spurious emissions. Yet, this test is not a direct measure, such as packet error rate. The spectrum test can be a good indicator of deteriorating performance. This test ensures that multiple WLAN devices do not unduly interfere with each other. FCC Title 47 Code of Federal Regulations Part 15 (47 CFR 15).ANSI/IEEE 802.11 Std 802.11 First edition Paragraph 15.4.7.4 Transmit spectrum mask.IEEE Std 802.11a-1999 Paragraph 17.3.9.2 Transmit spectrum mask.IEEE Std 802.11b-1999 Paragraph 18.4.7.3 Transmit spectrum mask.The transmit spectrum mask is the power contained in a specified frequency bandwidth at certain offsets, relative to the total carrier power.
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