Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Reexamination Certificate
1998-06-15
2001-01-30
Baker, Stephen M. (Department: 2784)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
Reexamination Certificate
active
06182260
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a channel encoding apparatus, and in particular to an improved channel encoding apparatus using a single concatenated encoder, which forms several subdata blocks having high data transmission rates, and encodes variable transmission rate data having high data transmission rates using a single concatenated encoder.
2. Description of the Related Art
In the field of conventional mobile communication, it further provides voice services than data services to users. Accordingly, a convolutional encoder is only used in the conventional mobile communication instead of a concatenated encoder with low encoding rate.
In the case that the systems which provide multimedia services such as an IMT2000 use only a convolutional encoder, they need high signal-to-noise ratio to maintain communication quality. As a result, the communication capacity in DS/CDMA system is reduced.
Also, in the case that the data transmission rate is variable and increased, since the system is additionally composed of a concatenated encoder, the system is complicated and the hardware of base station and terminal is complicated.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a channel encoding apparatus using a concatenated encoder, which overcomes the problem of additional complexity of an RS encoder due to variation of data transmission rates.
It is another object of the present invention to provide an improved channel encoding apparatus using a concatenated encoder which uniformly maintains communication quality in data services with each different data transmission rate.
It is another object of the present invention to provide improved channel encoding apparatus using a concatenated encoder which uses a single concatenated encoder to maintain communication quality, in the case that the concatenated encoder is used according to the kinds of data services in the system, which provide data services at several data transmission rates, such as IMT2000, or services having variable data transmission rates such as wireless multimedia services.
To achieve the above objects, there is provided an improved channel encoding apparatus using a single concatenated encoder which includes a data block former for forming subdata blocks according to input data bits per frame for each data transmission rate; a serial/parallel converter for converting information bits contained within the each subdata blocks formed by the data block former into several message symbols as a unit of 8 bits; a Reed-Solomon encoder for outputting the message symbols converted by the serial/parallel converter
2
, and generating several parity check symbols according to the message symbols to generate a Reed-Solomon code symbols; a parallel/serial converter for converting the Reed-Solomon code symbols generated by the Reed-Solomon encoder into serial data bit; a zero tail adder for adding eight zero tail bits to the serial data bit converted by a parallel/serial converter; and a convolutional encoder for convolutionally encoding the output data bits and the 8 zero tail bits.
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Kang Bub Joo
Kim Eung Bae
Oh Hyun Seo
Park Chae Min
Shim Jae Ryong
Baker Stephen M.
Electronics and Telecommunications Research Institute
Jacobson Price Holman & Stern PLLC
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