Title:
IDENTIFICATION METHOD FOR ELIMINATION OBJECT FRAME IN DIGITAL DATA TRANSMISSION SYSTEM
Document Type and Number:
Japanese Patent JP3246552
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain excellent frame elimination without eliminating voice frames having no error by comparing a forward composite symbol sequence that is convolution-decoded with a reverse composite symbol sequence that is subject to time inversion convolution-decoding and time base inversion for each bit.
SOLUTION: A PBER calculation device 7 compares a bit of a symbol sequence Z with a bit of a symbol sequence T for each bit to calculate a PBER 40. In the case that any bit difference is not recognized between data (symbol sequence Z) that are forward-decoded and data (symbol sequence T) that are reverse-decoded a PBER threshold value setting section 8 sets a PBER threshold, value 30 to a high level. In the case that a difference of 1 bit or over is detected in this comparison, the PBER threshold value 30 is set to a low level. After the PBER threshold value 30 is properly set, a convolution re-decoder 6 applies re-coding to 1 bit of a class of the symbol sequence Z and obtains a re-coded symbol to estimate a PBER of the decoded symbol.
Inventors:
Mark Burton
Stephen True Love
Stephen True Love
Application Number:
JP14024899A
Publication Date:
January 15, 2002
Filing Date:
May 20, 1999
Export Citation:
Assignee:
NEC
International Classes:
H03M13/01; H03M13/23; H04B14/04; H04L1/00; H04L1/20; (IPC1-7): H04L1/00; H03M13/01; H03M13/23
Domestic Patent References:
| JP7183855A | ||||
| JP11122225A | ||||
| JP8503593A | ||||
| JP6508253A |
Other References:
田島正登，ＩＴ９３−１１０ 双方向ビタビ復号とその応用，電子情報通信学会技術研究報告 情報理論，Ｖｏｌ．９３ Ｎｏ．５３０，２５−３０
Attorney, Agent or Firm:
Nobuyuki Kaneda (2 others)