Overview
Viterbi Decoders are used in systems where data are transmitted and subject to errors before reception. Compatible with many common standards such as DVB, 3GPP2, IEEE802.16, HiperLAN, Intelsat IESS-308/309, the Viterbi Decoder LogiCORE™ IP, along with other forward error correction cores from Xilinx offers highly-flexible concatenated codecs. The Viterbi Decoder LogiCORE IP consists of two basic architectures: a fully parallel implementation which gives fast data throughput and a serial implementation which occupies a small area. The core also has a puncturing option, giving a large range of transmission rates and reducing the bandwidth requirement on the channel. Puncturing can also be carried out externally to the decoder and the erasure pins in the erasure bus ERASE can be asserted to indicate the presence of null-symbols.
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This paper covers some practical aspects of designing the LDPC decoder starting from comparison between different techniques, different decoders parameters or standards, the effect of those parameters on the LDPC performance, also it discusses the algorithm selection process, and floating point implementation process.
We describe our SoC implementation of a baseband subsystem for a high performance 4G terminal. Our architecture, called FAUST, is based on distributed synchronization and asynchronous communication. We highlight how we have actually implemented these two
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In this paper, a typical research case will be described on how to extend an existing SoC architecture of baseband processor on 3G terminal to the player on network multimedia compressed with MPEG-4, especially on how to build an effectively multi-layer a