VSB transmission system

• US 7,894,549 B2
• Filed: 09/21/2009
• Issued: 02/22/2011
• Est. Priority Date: 10/02/2000
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Choi, In Hwan, Gu, Young Mo, Kwak, Kook Yeon, Kang, Kyung Won
• Primary Examiner(s): PUENTE, EVA YI ZHENG
• Application Number:
  US12/564,012
• Publication Number:
  US 20100017689A1
• Time in Patent Office: 519 Days
• Field of Search: 375/240, 375/295, 375/301, 375/265, 375/298, 375/340, 375/208, 375/310, 348/555, 348/470, 370/477, 370/466, 370/535, 714/792, 714/786
• US Class Current: 375/301
• CPC Class Codes: H03M 13/23 using convolutional codes, e.g. unit memory codes
• CPC Class Codes: H03M 13/256 with trellis coding, e.g. with convolutional codes and TCM
• CPC Class Codes: H03M 13/2939 using convolutional codes H03M13/2957 takes precedence
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/006 Trellis-coded modulation
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 27/02 Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation H04L27/32 takes precedence

Abstract

A vestigial sideband (VSB) modulation transmission system and a method for encoding an input signal in the system are disclosed. According to the present invention, the VSB transmission system includes a convolutional encoder for encoding an input signal, a trellis-coded modulation (TCM) encoder for encoding the convolutionally encoded signal, and a signal mapper mapping the trellis-coded signal to generate a corresponding output signal. Different types of the convolutional encoders are explored, and the experimental results showing the performances of the VSB systems incorporating each type of encoders reveals that a reliable data transmission can be achieved even at a lower input signal to noise ratio when a convolutional encoder is used as an error-correcting encoder in a VSB system.

Claims

1. A digital broadcast transmission system for processing first data and second data, the digital broadcast transmission system comprising:

a pre-processor configured to pre-process the first data through a first path;

a multiplexer configured to multiplex the pre-processed first data with the second data, the second data being input to the multiplexer through a second path different from the first path; and

a second ⅔

trellis encoder configured to perform trellis encoding on the multiplexed pre-processed first data and the second data

wherein the pre-processor further comprises;

a ½

convolutional encoder configured to perform convolutional encoding on one input data to generate two output data before the trellis encoding process; and

a first ⅔

trellis encoder configured to perform trellis encoding on the two output data to generate three output data.

2. The digital broadcast transmission system of claim 1, wherein the first data include at least audio or video data.