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Transmission of Digitally Encoded Speech at 1.2 Kbaud for PCN

Transmission of Digitally Encoded Speech at 1.2 Kbaud for PCN
Transmission of Digitally Encoded Speech at 1.2 Kbaud for PCN
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.
437-447
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
Salami, R
f75a385d-04ed-4cdb-a349-c94d8eb0adb1
Steele, R
7035a3e5-8a4c-434b-a105-46fe2d63d5c3
Fortune, P M
be27830a-9602-44e5-8fe4-9449f4995236
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
Salami, R
f75a385d-04ed-4cdb-a349-c94d8eb0adb1
Steele, R
7035a3e5-8a4c-434b-a105-46fe2d63d5c3
Fortune, P M
be27830a-9602-44e5-8fe4-9449f4995236

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.

Record type: Article

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.

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Published date: August 1992
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 257021
URI: https://eprints.soton.ac.uk/id/eprint/257021
PURE UUID: f1964a6a-7a14-47d4-b39f-3c6640f77f09
ORCID for L Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 10 Dec 2002
Last modified: 06 Jun 2018 13:14

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