Turbo-coded Orthogonal Frequency Division Multiplex transmission of 8 kbps encoded speech


Woodard, J P, Keller, T and Hanzo, L (1997) Turbo-coded Orthogonal Frequency Division Multiplex transmission of 8 kbps encoded speech. In, ACTS Summit'97, Aalborg, Denmark, 07 - 10 Oct 1997. , 894-899.

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Description/Abstract

In this paper we have considered using turbo channel coding to encode the 8 kbits/s output from the G.729 speech codec. The source and channel coded bits are then transmitted using a wideband Orthogonal Frequency Division Multiplexing (OFDM) system in the framework of the Mode-I FRAMES proposals [I]. We illustrate the benefits of using OFDM with channel coding to alleviate some of the problems associated with wideband fading channels. Furthermore, we discuss how OFDM can be used in conjunction with the G.729 speech codec and half rate channel coding in order to utilise one speechldata FRAMES subbburst. Finally some of the issues and problems associated with using turbo coded OFDM in speech transmission systems are considered using the system characterised in Table 1. In Figure 6 a channel SNR of 6dB appears sufficiently high under the stipulated system conditions for near-unimpaired speech transmission.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Event Dates: 7-10 October 1997 Organisation: ACTS'97 Address: Aalborg, Denmark
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Comms, Signal Processing & Control
ePrint ID: 251302
Date Deposited: 26 Oct 1999
Last Modified: 27 Mar 2014 19:52
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/251302

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