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A Digital Audio Broadcasting Scheme

A Digital Audio Broadcasting Scheme
A Digital Audio Broadcasting Scheme
The audio quality, robustness and complexity issues of a novel mobile digital audio broadcast (DAB) scheme are addressed. The audio codec is based on a combination of subband coding (SBC) and multipulse excited linear predictive coding (MPLPC), where the bit allocation is dynamically adapted according to both the signal power in different subbands and a perceptual hearing model. Typically a segmental signal to noise ratio (SEGSNR) in excess of 30 dB associated with high fidelity (HI-FI) subjective quality was achieved for 2.67 bits/sample transmissions at a mono bit rate of 86 kbits/s. Four different source-matched forward error correction (FEC) schemes were investigated in order to explore the complexity, bit rate and robustness trade-offs. When using 4 bit/symbol 16-level star-constellation - quadrature amplitude modulation (16-StQAM) the overall signalling rate became approximately 30 kBd, accommodating two stereo DAB channels in a conventional 200 kHz analogue FM channel's bandwidth. Our diversity assisted DAB scheme required a channel signal to noise ratio (SNR) of about 25 dB for unimpaired audio quality via the worst-case Rayleigh fading mobile channel, when the mobile speed was 30 mph and the propagation frequency was 1.5 GHz. In case of the stationary Gaussian scenario an SNR of about 20 dB was required.
1.6-1.8
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Lin, X.
723753d7-5afe-4a4b-8f53-28bff7912c16
Steele, R.
7b1e6d15-a296-43bc-8ff2-37fbeb71b0ae
Webb, W.
f371ee06-7993-4a3c-aec9-606996e198b4
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Lin, X.
723753d7-5afe-4a4b-8f53-28bff7912c16
Steele, R.
7b1e6d15-a296-43bc-8ff2-37fbeb71b0ae
Webb, W.
f371ee06-7993-4a3c-aec9-606996e198b4

Hanzo, L., Lin, X., Steele, R. and Webb, W. (1995) A Digital Audio Broadcasting Scheme At Proc. of 2nd International Workshop on Mobile Multimedia Communications, United Kingdom. 11 - 14 Apr 1995. , 1.6-1.8.

Record type: Conference or Workshop Item (Paper)

Abstract

The audio quality, robustness and complexity issues of a novel mobile digital audio broadcast (DAB) scheme are addressed. The audio codec is based on a combination of subband coding (SBC) and multipulse excited linear predictive coding (MPLPC), where the bit allocation is dynamically adapted according to both the signal power in different subbands and a perceptual hearing model. Typically a segmental signal to noise ratio (SEGSNR) in excess of 30 dB associated with high fidelity (HI-FI) subjective quality was achieved for 2.67 bits/sample transmissions at a mono bit rate of 86 kbits/s. Four different source-matched forward error correction (FEC) schemes were investigated in order to explore the complexity, bit rate and robustness trade-offs. When using 4 bit/symbol 16-level star-constellation - quadrature amplitude modulation (16-StQAM) the overall signalling rate became approximately 30 kBd, accommodating two stereo DAB channels in a conventional 200 kHz analogue FM channel's bandwidth. Our diversity assisted DAB scheme required a channel signal to noise ratio (SNR) of about 25 dB for unimpaired audio quality via the worst-case Rayleigh fading mobile channel, when the mobile speed was 30 mph and the propagation frequency was 1.5 GHz. In case of the stationary Gaussian scenario an SNR of about 20 dB was required.

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More information

Published date: April 1995
Additional Information: MoMuc-2 Event Dates: 11-14 April 1995 Address: Bristol, UK
Venue - Dates: Proc. of 2nd International Workshop on Mobile Multimedia Communications, United Kingdom, 1995-04-11 - 1995-04-14
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 251353
URI: http://eprints.soton.ac.uk/id/eprint/251353
PURE UUID: f0eb1d35-6004-476c-abc5-3d3ea04e08eb
ORCID for L. Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 28 Oct 1999
Last modified: 18 Jul 2017 10:10

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Contributors

Author: L. Hanzo ORCID iD
Author: X. Lin
Author: R. Steele
Author: W. Webb

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