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2 .. _sec-spectrum-module: | 2 .. _sec-spectrum-module: |
3 | 3 |
4 Spectrum Module | 4 Spectrum Module |
5 --------------- | 5 --------------- |
6 | 6 |
7 .. include:: replace.txt | 7 .. include:: replace.txt |
8 .. highlight:: cpp | 8 .. highlight:: cpp |
9 | 9 |
10 .. heading hierarchy: | 10 .. heading hierarchy: |
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476 various countries around the world, and analog modulation which is a legacy· | 476 various countries around the world, and analog modulation which is a legacy· |
477 technology but is still being used by some countries today. To accomplish· | 477 technology but is still being used by some countries today. To accomplish· |
478 realistic PSD models for these modulation types, the signals’ PSDs were· | 478 realistic PSD models for these modulation types, the signals’ PSDs were· |
479 approximated from real standards and developed into models that are scalable by· | 479 approximated from real standards and developed into models that are scalable by· |
480 frequency and power. The COFDM PSD is approximated from Figure 12 (8k mode) of· | 480 frequency and power. The COFDM PSD is approximated from Figure 12 (8k mode) of· |
481 [KoppCOFDM], the 8-VSB PSD is approximated from Figure 3 of [Baron8VSB], and the······· | 481 [KoppCOFDM], the 8-VSB PSD is approximated from Figure 3 of [Baron8VSB], and the······· |
482 analog PSD is approximated from Figure 4 of [QualcommAnalog]. Note that the· | 482 analog PSD is approximated from Figure 4 of [QualcommAnalog]. Note that the· |
483 analog model is approximated from the NTSC standard, but other analog modulation······· | 483 analog model is approximated from the NTSC standard, but other analog modulation······· |
484 standards such as PAL have similar signals. The approximated COFDM PSD model is· | 484 standards such as PAL have similar signals. The approximated COFDM PSD model is· |
485 in 8K mode. The other configurable attributes are the start frequency,· | 485 in 8K mode. The other configurable attributes are the start frequency,· |
486 signal/channel bandwidth, channel number, base PSD, antenna type, starting time,
· | 486 signal/channel bandwidth, base PSD, antenna type, starting time,· |
487 and transmit duration. | 487 and transmit duration. |
488 | 488 |
489 ``TvSpectrumTransmitter`` uses ``IsotropicAntennaModel`` as its antenna model by······· | 489 ``TvSpectrumTransmitter`` uses ``IsotropicAntennaModel`` as its antenna model by······· |
490 default, but any model that inherits from ``AntennaModel`` is selectable, so· | 490 default, but any model that inherits from ``AntennaModel`` is selectable, so· |
491 directional antenna models can also be used. The propagation loss models used· | 491 directional antenna models can also be used. The propagation loss models used· |
492 in simulation are configured in the ``SpectrumChannel`` that the user chooses to······· | 492 in simulation are configured in the ``SpectrumChannel`` that the user chooses to······· |
493 use. Terrain and spherical Earth/horizon effects may be supported in future ns-3······· | 493 use. Terrain and spherical Earth/horizon effects may be supported in future ns-3······· |
494 propagation loss models. | 494 propagation loss models. |
495 | 495 |
496 After the attributes are set, along with the ``SpectrumChannel``,· | 496 After the attributes are set, along with the ``SpectrumChannel``,· |
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595 Television. Air Power Australia. <http://www.ausairpower.net/AC-1100.html>. | 595 Television. Air Power Australia. <http://www.ausairpower.net/AC-1100.html>. |
596 | 596 |
597 .. [MatlabGeo] "Geodetic2ecef." Convert Geodetic to Geocentric (ECEF)· | 597 .. [MatlabGeo] "Geodetic2ecef." Convert Geodetic to Geocentric (ECEF)· |
598 Coordinates. The MathWorks, Inc.· | 598 Coordinates. The MathWorks, Inc.· |
599 <http://www.mathworks.com/help/map/ref/geodetic2ecef.html>. | 599 <http://www.mathworks.com/help/map/ref/geodetic2ecef.html>. |
600 | 600 |
601 .. [QualcommAnalog] Stephen Shellhammer, Ahmed Sadek, and Wenyi Zhang.· | 601 .. [QualcommAnalog] Stephen Shellhammer, Ahmed Sadek, and Wenyi Zhang.· |
602 "Technical Challenges for Cognitive Radio in the TV White Space Spectrum."· | 602 "Technical Challenges for Cognitive Radio in the TV White Space Spectrum."· |
603 Qualcomm Incorporated. | 603 Qualcomm Incorporated. |
604 | 604 |
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