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Error Recovery-Channel Coding and Packetization Bengt J. Borgstrm, Alexis Bernard, and Abeer Alwan

Summary: 8
Error Recovery- Channel Coding and Packetization
Bengt J. Borgström, Alexis Bernard, and Abeer Alwan
Abstract. Distributed Speech Recognition (DSR) systems rely on efficient
transmission of speech information from distributed clients to a centralized server.
Wireless or network communication channels within DSR systems are typically
noisy and bursty. Thus, DSR systems must utilize efficient Error Recovery (ER)
schemes during transmission of speech information. Some ER strategies, referred to
as forward error control (FEC), aim to create redundancy in the source coded bit-
stream to overcome the effect of channel errors, while others are designed to create
spread or delay in the feature stream in order to overcome the effect of bursty chan-
nel errors. Furthermore, ER strategies may be designed as a combination of the pre-
viously described techniques. This chapter presents an array of error recovery tech-
niques for remote speech recognition applications.
This chapter is organized as follows. First, channel characterization and
modeling are discussed. Next, media-specific FEC is presented for packet erasure
applications, followed by a discussion on media-independent FEC techniques for bit
error applications, including general linear block codes, cyclic codes, and convolu-
tional codes. The application of unequal error protection (UEP) strategies utilizing
combinations of the aforementioned FEC methods is also presented. Finally, frame-


Source: Alwan, Abeer - Electrical Engineering Department, University of California at Los Angeles


Collections: Computer Technologies and Information Sciences