Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Reexamination Certificate
1998-12-08
2001-12-18
Moise, Emmanuel L. (Department: 2133)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
C375S262000, C375S281000, C375S331000, C375S341000
Reexamination Certificate
active
06332208
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a data transmitting apparatus for convolutional coding data on a transmitter side and for decoding data on a receiver side, and relates to a data transmitting method.
2. Description of the Related Art
In the data communications via a radio communication network, since a bit error frequently occurs, an error correction processing must be performed. As one of error correction methods, there is a method in which coding data obtained by convolutional coding an input bit is decoded by a decoding method on a receiver side.
FIG. 1
is a frame structural view of frame data according to a conventional data transmitting apparatus. In
FIG. 1
, a tail bit
12
is added to transmitting data
11
for each frame.
FIG. 2
is a frame structural view of data before and after convolutional coding according to the conventional data transmitting apparatus. As shown in
FIG. 2
, coding data
21
is obtained by convolutional coding frame data obtained by adding the tail bit
12
to transmitting data
11
. If a total data length of coding data is below a predetermined frame length, a dummy bit
22
for covering the shortfall is inserted to coding data
21
. The transmitter side transmits data having the dummy bit
22
inserted to coding data
21
as a transmitting signal of one unit.
However, in the conventional data transmitting apparatus and data transmitting method, the dummy bit having no information is added to data, which has been convolutional coded. This results in an increase in redundancy, and causes a problem in which a transmission quality cannot be improved.
Moreover, on a receiver side, since the path metric of data, which is used in decoding as a reference, is long, a large number of operations and a large quantity of memory capacity are required. This causes a problem in which the hardware scale of a decoder is increased.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a data transmitting apparatus, which can improve a transmission quality by reducing the number of dummy bit insertions and which can reduce the hardware scale of a decoder by decreasing an amount of processing at a decoding time, and to provide a data transmitting method.
The above object can be attained as follows.
More specifically, on a transmitter side, a known bit is inserted at a predetermined position of transmitting data to perform convolutional coding. On a receiver side, a receiving signal is divided into a convolutional coded portion and a subsequent portion so as to perform decoding.
REFERENCES:
patent: 4908827 (1990-03-01), Gates
patent: 5673291 (1997-09-01), Dent
patent: 5-183448 (1993-07-01), None
patent: 7254861 (1995-10-01), None
patent: 9-74404 (1997-03-01), None
patent: 9-172428 (1997-06-01), None
Article entitled “Am Improved Convolutional Code by Inserting Fixed Bits”, by O. Kato et al., published in 1991 Fall Convention of Association of Electronic Communication, p. B-221 (Aug. 15, 1981), with English language translation.
English Language Abstract of JP 5183448.
English Language Abstract of JP 9-74404.
English Language Abstract of JP 9-172428.
An English Language abstract of JP-7-254861.
Greenblum & Bernstein P.L.C.
Matsushita Electric - Industrial Co., Ltd.
Moise Emmanuel L.
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