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Author Weiß, C. ♦ Stockhammer, T. ♦ Hagenauer, J.
Source CiteSeerX
Content type Text
File Format PDF
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Peak Complexity ♦ Post Processing Operation ♦ Adaptive Channel Coding ♦ Error Correction ♦ Error Detection ♦ New Channel Coding System ♦ Gsm Fullrate Speech Codec ♦ Dedicated Error Detection Code ♦ Modified Sequential Decoder ♦ Far End Error Decoder ♦ Decoded Frame ♦ Decoded Path ♦ Single High-memory Convolutional Code ♦ First Error ♦ New Approach ♦ Fullrate Speech Codec ♦ Single Code ♦ Conventional Sequential Decoding Procedure ♦ Standard Gsm System ♦ Average Feed ♦ State Complexity ♦ Path Reliability ♦ Channel Condition ♦ Channel Snr ♦ Wasting Bandwidth ♦ Scalable Complexity ♦ Mobile Channel ♦ Suited Source ♦ High-memory Convolutional Code
Description We present a new channel coding system which combines error detection and error correction using a single high-memory convolutional code, i.e., no dedicated error detection code is required. Since the state complexity of high-memory convolutional codes makes maximum-likelihood decoding impractical, a modified sequential decoder –the Far End Error Decoder (FEED) – is proposed. FEED adds to the conventional sequential decoding procedure a post processing operation which allows to compute the path reliability of the decoded path. With this path reliability the first error in the decoded frame can be localized, thus, enabling combined error correction and detection with a single code. The advantage of the proposed scheme over applying a dedicated error detection code is demonstrated at the example of the GSM Fullrate Speech Codec. Although the Fullrate Speech Codec is by far not the most suited source coding scheme for our new approach, a gain of up to ¢ dB in SegSNR or £ dB in channel SNR can be achieved with a peak complexity equal to the standard GSM system. However, in average FEED uses a significantly lower number of operations. Moreover, FEED has a scalable complexity and is self-adaptive to varying channel conditions. 1
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article
Publisher Institution in Proc. of ICICSP 2001