Study of Turbo Codes and Extensions

小行星9415996 本项目研究了最近描述的差错控制编码技术，称为Turbo编码，它声称显着降低的信号噪声比所需的可靠通信的高斯噪声信道上，仍然合理的复杂性。 本研究将研究基线技术来证实初步的研究结果，并探讨对交织器设计和组成码复杂度等问题的敏感性。 正在研究减少延迟、存储器和计算要求的改进，目的是使这一概念在当代应用中真正实用，如分组无线网络。 也正在研究的基本编码思想（分量编码与迭代，相互作用的解码），以较低的速率计划的扩展，试图超越0 dB的障碍Eb/No。一个“对称”的形式，基本的迭代解码器已经开发出来，正在研究中。 更重要的是，这个概念将扩展到高斯信道的带宽有效的网格编码调制，并为瑞利衰落信道的代码。 ***

9415996 Wilson This project investigates a recently described error control coding technique, called Turbo coding, which claims to significantly lower the signal-to-noise ratio required for reliable communication on the Gaussian noise channel, for still reasonable complexity. The research will study the baseline technique to corroborate the initial findings, and explore the sensitivity to such issues as interleaver design and constituent code complexity. Improvements which lessen the delay, memory, and computational requirements are under study, with the aim of making this concept truly practical in contemporary applications such as packetized wireless networks. Also under study is the extension of the basic coding ideas (component coding with iterative, interacting decoding) to lower rate schemes, with an attempt to get beyond the 0 dB barrier on Eb/No. A 'symmetric' form for the basic iterative decoder has been developed and is under study. More importantly, the concept will be extended to bandwidth efficient trellis coded modulation for the Gaussian channel, and to codes for Rayleigh fading channels. ***