Abstract
A burst-by-burst adaptive speech transceiver is proposed, which can drop its source coding rate and speech quality under transceiver control in order to invoke a more error resilient modem mode amongst less favourable channel conditions. The novel, high-quality, adaptive multi-rate (AMR) speech codec (see GSM 06.90, version 7.0.0, 1998), operated at bit rates of 4.75 and 10.2 kbps and combined with source-sensitivity-matched redundant residue number systems (RRNS) based channel codes. Burst-by-burst adaptive joint-detection based code division multiple access (JD-CDMA) is used for transmitting the dual-rate bitstream generated by the AMR speech codec.
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