Transmission of Digitally Encoded Speech at 1.2 Kbaud for PCN


Hanzo, L, Salami, R, Steele, R and Fortune, P M (1992) Transmission of Digitally Encoded Speech at 1.2 Kbaud for PCN. IEE Proceedings, Part I, 139, (4), 437-447.

This is the latest version of this item.

Download

[img] PDF
Download (1012Kb)

Description/Abstract

The transmission of digitally encoded speech at 1.2 Kbaud for mobile personal communication networks (PCN) is investigated both analytically and by computer simulations. Speech was encoded at 4.8 Kbit/s using a low complexity transform binary pulse excited LPC codec. A 64-level QAM modem was used having 3 sub channels that operated with different BERs. The sensitivity of the encoded speech bits to transmission errors was identified, and the bits classified into 3 groups. Each group was then individually coded by BCH codec of differing power. The output of the BCH coders were grey coded onto 3 QAM channels. By this arrangement the protection given to the speech bits was dependent on their vulnerability. The 6 bit QAM symbols were transmitted at 1.2 Kbaud over Rayleigh fading channels with pedestrian mobiles travelling upto 4 mile/h. For microcells using a propoagation frequency of 1.9 GHz and operating with channel SNRs in excess 26 dB we achieved good communication quality speech when second-order diversity and AGC were used.

Item Type: Article
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Comms, Signal Processing & Control
ePrint ID: 257021
Date Deposited: 10 Dec 2002
Last Modified: 27 Mar 2014 19:59
Further Information:Google Scholar
ISI Citation Count:4
URI: http://eprints.soton.ac.uk/id/eprint/257021

Available Versions of this Item

  • Transmission of Digitally Encoded Speech at 1.2 Kbaud for PCN. (deposited 10 Dec 2002) [Currently Displayed]

Actions (login required)

View Item View Item

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics