Apparatus and method of eliminating vestigial sideband pilot tone in vestigial sideband/quadrature amplitude modulation system
US6944241B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 24, 2000 |
| Grant date | Sep 13, 2005 |
| Priority date | — |
| Expiry date | Feb 4, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for eliminating a vestigial sideband (VSB) pilot tone in a vestigial sideband/quadrature amplitude modulation (VSB/QAM) receiving system, is provided. This apparatus eliminates a vestigial sideband (VSB) pilot tone in a vestigial sideband/quadrature amplitude modulation (VSB/QAM) shared receiving system including a VSB/QAM shared modulator for demodulating a received VSB signal and outputting I-axis VSB symbols and Q-axis VSB symbols. This apparatus includes an I-axis pilot tone eliminating unit for dividing the I-axis VSB symbols into a plurality of groups according to the sign of a pilot tone which remains in each symbol, obtaining the size of a pilot tone by calculating the average of VSB symbols in each group, and eliminating a pilot tone by adding the size of a pilot tone to or subtracting it from the I-axis VSB symbols, and a Q-axis pilot tone eliminating unit for dividing the Q-axis VSB symbols into a plurality of groups according to the sign of a pilot tone which remains in each symbol, obtaining the size of a pilot tone by calculating the average of VSB symbols in each group, and eliminating a pilot tone by adding the size of a pilot tone to or subt…
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