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A 2.1 kBd speech transmission system for Rayleigh-fading channels

A 2.1 kBd speech transmission system for Rayleigh-fading channels
A 2.1 kBd speech transmission system for Rayleigh-fading channels
In the global microcellular mobile network of the near future extremely high traffic densities have to be carried. The well-known GSM system is capable of handling a traffic density of typically 10 erlang/MHz/km2 among adverse channel conditions in the large, maximum 35 km diameter traffic cells. In the future global microcellular mobile network the initiated traffic densities can be as much as three orders of magnitude higher, whence extreme spectral efficiency is required. Also, the frequency reuse distances have to be reduced to enable handling of the initiated traffic. This results into a microcellular structure with favourable propagation characteristics. In this situation the channel can generally be described by a Rician model, although in the worst-case scenario the flat Rayleigh-fading model applies. As a consequence, low bit rate speech codecs with moderate error correction coding and multilevel modulation schemes without channel equalisers can be deployed to achieve the required bandwidth efficiency.
10/1-10/5
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Salami, R.
f75a385d-04ed-4cdb-a349-c94d8eb0adb1
Steele, R.
7035a3e5-8a4c-434b-a105-46fe2d63d5c3
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Salami, R.
f75a385d-04ed-4cdb-a349-c94d8eb0adb1
Steele, R.
7035a3e5-8a4c-434b-a105-46fe2d63d5c3

Hanzo, L., Salami, R. and Steele, R. (1989) A 2.1 kBd speech transmission system for Rayleigh-fading channels. IEE Colloquium on Speech Coding, Savoy Place, United Kingdom. 08 - 09 Oct 1989. 10/1-10/5 .

Record type: Conference or Workshop Item (Paper)

Abstract

In the global microcellular mobile network of the near future extremely high traffic densities have to be carried. The well-known GSM system is capable of handling a traffic density of typically 10 erlang/MHz/km2 among adverse channel conditions in the large, maximum 35 km diameter traffic cells. In the future global microcellular mobile network the initiated traffic densities can be as much as three orders of magnitude higher, whence extreme spectral efficiency is required. Also, the frequency reuse distances have to be reduced to enable handling of the initiated traffic. This results into a microcellular structure with favourable propagation characteristics. In this situation the channel can generally be described by a Rician model, although in the worst-case scenario the flat Rayleigh-fading model applies. As a consequence, low bit rate speech codecs with moderate error correction coding and multilevel modulation schemes without channel equalisers can be deployed to achieve the required bandwidth efficiency.

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More information

Published date: October 1989
Additional Information: Digest No. 1989/112
Venue - Dates: IEE Colloquium on Speech Coding, Savoy Place, United Kingdom, 1989-10-08 - 1989-10-09
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 257057
URI: http://eprints.soton.ac.uk/id/eprint/257057
PURE UUID: 8be899c9-9075-4ba2-aef9-7cbba7b083a7
ORCID for L. Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 11 Dec 2002
Last modified: 23 Sep 2020 01:31

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