Transmission of Subband-Coded Images via Mobile Channels


Stedman, R, Gharavi, H, Hanzo, L and Steele, R (1993) Transmission of Subband-Coded Images via Mobile Channels. IEEE Transactions on Circuits and Systems for Video Technology, 3, (1), 15-26.

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Description/Abstract

Abstract - The feasibility of a mobile video handset is investigated via Rayleigh-fading channels, where transmissions must be confined to the channel's coherence bandwidth to avoid the deployment of complex high-power-consumption channel equalizers. This necessitates the utilization of a low-bit-rate image codec error protected by embedded low-complexity Bose-Chaudhuri-Hoequenghem (BCH) codecs and spectrally efficient 16-level quadrature amplitude modulation (16-QAM). Motion-compensated onuniform 7-band subband coding (SBC) with subband-specific scanning, adaptive quantization (Q), run-length coding (RLO, and adaptive buffering to equalize bit-rate fluctuations offer good objective and subjective image quality at moderate complexity and a bit rate of 55 kbit/s. Using a twin-class embedded-BCH error protection as well as pilot symbol and diversity-assisted 16-QAM, our 22-kBd candidate system yields unimpaired image quality for average channel signal-to-noise ratios (SNR) in excess of about 16-18 dB, when the mobile speed is 4 mi/h, an SNR value readily maintained in personal-communications mobile systems characterized by small cells.

Item Type: Article
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Comms, Signal Processing & Control
ePrint ID: 251398
Date Deposited: 03 Apr 2001
Last Modified: 27 Mar 2014 19:52
Further Information:Google Scholar
ISI Citation Count:41
URI: http://eprints.soton.ac.uk/id/eprint/251398

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