US 2003/0115540 A1 · Base-band encoding apparatus and frequency modulation method using the same in digital broadcasting system

Abstract

A baseband encoding apparatus and frequency modulation method using the same in vestigial sideband (VSB) transmission system is disclosed. The apparatus includes a trellis encoder having a 1/2 code rate for generating a 2-bit output signal based on a 1-bit input signal and generating 4 types of signal levels in baseband by using the 2-bit output signal for converting the 4 types of the signal levels of the trellis encoder to symbols and generating 4 types of output symbols. The present invention can improve the receiving performance of the VSB transmission system in a mobile environment by implementing the trellis coded modulation having 1/2 code rate in the VSB broadcasting transmission system, which critically decreases minimum signal-to-noise ratio for recovering an original signal.

Claims6

Dependent claims

A baseband encoding apparatus in a vestigial sideband transmission system, comprising:

a trellis encoder having a 1/2 code rate for generating a 2-bit output signal based on a 1-bit input signal and generating 4 types of signal levels in baseband by using the 2-bit output signal, wherein the trellis encoder includes M number of delayers and N number of binary adders and M and N are natural numbers;
and
a symbol mapper for converting the 4 types of the signal levels of the trellis encoder to symbols and generating 4 types of output symbols.

Dependencies are inferred from the claim text.

Base-band encoding apparatus and frequency modulation method using the same in digital broadcasting system

Life of this patent

Base-band encoding apparatus and frequency modulation method using the same in digital broadcasting system

Life of this patent

Abstract

Claims6