Stopping-Free Dynamic Configuration of a Multi-ASIP Turbo Decoder

Abstract

The multiplication of wireless standards is introducing the need of flexible and reconfigurable multistandard base band receivers. At the physical layer, multiprocessor turbo decoders have been recently developed in order to provide an answer to the increasing throughput requirement of emerging standards. However these solutions do not sufficiently address reconfiguration performance issues which can be a limiting factor in the future. This work focuses on the design of a reconfigurable multiprocessor architecture for turbo decoding achieving very fast reconfiguration without compromising decoding performances. Dynamic reconfiguration can be performed within a single frame decoding duration opening new perspective for reconfigurable multistandard base band receivers. For that purpose, optimizations at the processing element level and a novel bus-based configuration infrastructure are proposed. Results show that up to 64 processings elements can be dynamically configured in 5.352 μs. This low configuration latency corresponds to a single frame decoding duration when performing 6 decoding iterations for a throughput up to 666 Mbps.