发明名称 |
AN FEC SCHEME FOR ENCODING TWO BIT-STREAMS |
摘要 |
<p>An encoding system is configured to allow data to be transmitted at one of two selectable bit-error-rate quality factors. The first bit-error-rate quality factor selection corresponds to the conventional ATSC FEC encoding systems, and the second bit-error-rate quality factor selection provides an ATSC-like FEC encoding scheme that substantially improves the bit-error-rate. The first quality factor selection effects a 2/3 trellis encoding, whereas the higher quality factor selection effects a 1/3 trellis encoding. Because the high-quality trellis encoding rate of 1/3 is half the lower-quality trellis encoding rate of 2/3, the data rate of this high-quality encoded bit-stream is half that of the conventional lower-quality encoded bit-stream. The 1/3 trellis encoding is effected using an ATSC-compatible encoding and a modified symbol mapping. The encoding scheme provides 2:1 data redundancy and the symbol mapping provides a maximum distance for the redundant encoding. By combining techniques that each decrease the likelihood of an uncorrectable error at the receiver, the substantial improvement in bit-error-rate can be achieved. At the receiver, a single trellis decoder with different metric tables is used to decode the two bit-streams, thereby providing substantial compatibility with ATSC-compatible receivers.</p> |
申请公布号 |
WO0215446(A1) |
申请公布日期 |
2002.02.21 |
申请号 |
WO2001EP08811 |
申请日期 |
2001.07.31 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V. |
发明人 |
GADDAM, VASANTH, R.;BRYAN, DAVID, A.;KELLIHER, PATRICK |
分类号 |
H04N7/26;H03M13/25;H03M13/27;H03M13/35;H03M13/41;H04N5/44;H04N7/66;H04N21/2383;H04N21/438;(IPC1-7):H04H1/00;H03M13/23;H04N5/00 |
主分类号 |
H04N7/26 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|