检索结果-内蒙古大学图书馆

Low-power state-parallel relaxed adaptive viterbi decoder

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS 2007年第5期54卷 1060-1068页

作者： Sun, Fei Zhang, Tong Rensselaer Polytech Inst Dept Elect Comp & Syst Engn Troy NY 12180 USA

Although it possesses reduced computational complexity and great power saving potential, conventional adaptive viterbi algorithm implementations contain a global best survivor path metric search operation that prevents it from being directly implemented in a high-throughput state-parallel decoder. This limitation also incurs power and silicon area overhead. This paper presents a modified adaptive viterbi algorithm, referred to as the relaxed adaptive viterbi algorithm, that completely eliminates the global best survivor path metric search operation. A state-parallel decoder VLSI architecture has been developed to implement the relaxed adaptive viterbi algorithm. Using convolutional code decoding as a test vehicle, we demonstrate that state-parallel relaxed adaptive viterbi decoders, versus viterbi counterparts, can achieve significant power savings and modest silicon area reduction, while maintaining almost the same decoding performance and very high throughput.

关键词： adaptive viterbi algorithm low power T-algorithm very large-scale integration (VLSI) architecture

来源：评论

学校读者我要写书评

暂无评论

Sequence detection for MPSK/MQAM with adaptive phase tracking

引用

Physical Communication 2009年第3期2卷 217-227页

作者： Li, Yan Kam, Pooi Yuen Chui, Chee-Cheon Department of Electrical and Computer Engineering National University of Singapore S117576 Singapore DSO National Laboratories S118230 20 Science Park Drive Singapore

In [P.Y. Kam, P. Sinha, A viterbi-type algorithm for efficient estimation of MPSK sequences over the Gaussian channel with unknown carrier phase, IEEE Trans. Commun. COM-43 (1995) 2429-2433], we developed a viterbi algorithm for efficient detection of M-ary phase-shift keyed (MPSK) sequences received over the additive, white, Gaussian noise (AWGN) channel with an unknown carrier phase. By assuming the carrier phase is constant over some L symbol intervals and using the sequence detection metric in [P.Y. Kam, Maximum-likelihood digital data sequence estimation over the Gaussian channel with unknown carrier phase, IEEE Trans. Commun. COM-35 (1987) 764-767] as the decoding metric, it approaches the performance of coherent detection, provided the observation interval L for forming the decoding metric is sufficiently long. However, this observation interval L is fixed, and chosen based on prior knowledge of the carrier phase characteristics. Thus, the metric is nonadaptive, and cannot be optimized when a priori statistical knowledge of the carrier phase is not available. The work here renders it adaptive by developing a recursive metric that is adapted on-line based on the received signals, without prior knowledge of the carrier phase characteristics. We first derive a metric for the maximum likelihood sequence detector for a general M-ary quadrature amplitude modulation (MQAM) sequence received in the presence of AWGN and an unknown, slowly- and randomly-varying carrier phase. To reduce the receiver complexity, a practical, suboptimal metric is obtained. A recursive form of the metric using adaptive reference estimation as in [P.Y. Kam, K.H. Chua, X. Yu, adaptive symbol-by-symbol reception of MPSK on the Gaussian channel with unknown carrier phase characteristics, IEEE Trans. Commun. COM-46 (1998) 1275-1279], is proposed. Comparison between the proposed adaptive, recursive metric and those in the literature is provided. Simulation results using a random-walk carrier pha

关键词： adaptive viterbi algorithm Maximum likelihood sequence detection Unknown carrier phase

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：