A Re-configurable Cordless Telecommunications Scheme

Recently there has been a considerable effort devoted to intelligent joint speech coding and iorward error correction (FEC) coding [I] as well as to equal [2] and un-equal protection coded modulation [3]. In reference [4] Hagenauer introduced an intelligent framework for considering source significance-, channel stateand decoder reliability-information in order to achieve the best possible performance over fading channels. In this contribution we propose a complete re-configurable transceiver, which employs unequal protection pilot symbol assisted block coded modulation embedded in the source codec. A unique feature of the transceiver is that it can be reconfigured under network control as a lower speech quality, more robust or higher speech quality, less robust terminal in order to accommodate more benign or more hostiIe channel conditions, while using the same system bandwidth. Section 2 briefly describes the re-configurable transceiver scheme, Section 3 details the proposed dual-rate ACELP codec, followed by a short discussion on bit sensitivity issues in Section 4, on modulation as well as packet reservation multiple access (PRMA) in Section 5 and source-matched embedded error protection in Section 6. Finally, before concluding, the system performance is characterised in Section 7.