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A Subband Coding, BCH Coding, and 16-QAM System for Mobile Radio Speech Communications

A Subband Coding, BCH Coding, and 16-QAM System for Mobile Radio Speech Communications
A Subband Coding, BCH Coding, and 16-QAM System for Mobile Radio Speech Communications
Abstract-A combined subband speech coding (SBC), Bose- Chaudhuri-Hoequenghem (BCH) error-correction coding, and 16-level quadrature amplitude modulation (16-QAM) scheme with switched diversity and speech postenhancement is proposed. The system's performance is dramatically improved by deploying some degree of fade tracking capability over fading channels. Further quality enhancement accrues by using appropriate mapping between the SBC speech codec and the Gray coded QAM words. Various BCH codes are utilized to adequately match the error-correcting power to the perceptual importance of the 8BC bits. One of our proposed systems operates at 7 kBd and yields good communications-quality speech for channel signal-to-noise ratios (SNR's) in excess of 20 dB and encounters a maximum overall system delay of 55.125 ms. A more complex arrangement uses second-order switched diversity to reduce both the channel SNR required to around 16 dB and the transmission rate to 5 kBd, when the vehicular speed is 30 mi/h, while the system delay is unchanged at 55.125 ms.
0018-9545
327-339
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
Steele, R
7035a3e5-8a4c-434b-a105-46fe2d63d5c3
Fortune, P M
be27830a-9602-44e5-8fe4-9449f4995236
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
Steele, R
7035a3e5-8a4c-434b-a105-46fe2d63d5c3
Fortune, P M
be27830a-9602-44e5-8fe4-9449f4995236

Hanzo, L, Steele, R and Fortune, P M (1990) A Subband Coding, BCH Coding, and 16-QAM System for Mobile Radio Speech Communications IEEE Transactions on Vehicular Technology, 39, (4), pp. 327-339.

Record type: Article

Abstract

Abstract-A combined subband speech coding (SBC), Bose- Chaudhuri-Hoequenghem (BCH) error-correction coding, and 16-level quadrature amplitude modulation (16-QAM) scheme with switched diversity and speech postenhancement is proposed. The system's performance is dramatically improved by deploying some degree of fade tracking capability over fading channels. Further quality enhancement accrues by using appropriate mapping between the SBC speech codec and the Gray coded QAM words. Various BCH codes are utilized to adequately match the error-correcting power to the perceptual importance of the 8BC bits. One of our proposed systems operates at 7 kBd and yields good communications-quality speech for channel signal-to-noise ratios (SNR's) in excess of 20 dB and encounters a maximum overall system delay of 55.125 ms. A more complex arrangement uses second-order switched diversity to reduce both the channel SNR required to around 16 dB and the transmission rate to 5 kBd, when the vehicular speed is 30 mi/h, while the system delay is unchanged at 55.125 ms.

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Published date: November 1990
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 251410
URI: http://eprints.soton.ac.uk/id/eprint/251410
ISSN: 0018-9545
PURE UUID: 74ff749c-99ad-41c2-a742-83a615389293
ORCID for L Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 04 Apr 2001
Last modified: 18 Jul 2017 10:09

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Contributors

Author: L Hanzo ORCID iD
Author: R Steele
Author: P M Fortune

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