Near Shannon Limit and Low Peak to Average Power Ratio Turbo Block Coded OFDM
Near Shannon Limit and Low Peak to Average Power Ratio Turbo Block Coded OFDM
复制标题
DOI：
10.1109/tcomm.2011.080111.090356
复制
发表时间：
2011-08
影响因子：
8.3
通讯作者：
M. Sabbaghian;Yongjun Kwak;B. Smida;V. Tarokh
中科院分区：
文献类型：
--
作者：
M. Sabbaghian;Yongjun Kwak;B. Smida;V. Tarokh
针对正交频分复用（OFDM）系统中峰均功率比（PAPR）大的问题，提出了一种改进的解决方案。虽然低PAPR码字的设计已经被广泛研究，并且具有低PAPR的渐近好码的存在也被证明，但是仍然没有构造出满足所有要求的码。本文的主要目标是开发一种编码方案，不仅产生低PAPR码字，但它也执行相对接近香农限。我们通过实现时频Turbo块编码OFDM来实现这一目标。在这个方案中，我们设计的频域组件有一个严格限制的峰均比。时域分量码的设计是为了获得良好的性能，而译码算法具有合理的复杂度。通过比较性能评估，我们表明，利用所提出的方法，我们实现了相当大的改善PAPR方面，而我们稍微宽松的性能相比，容量实现代码具有类似的整体块长度。
In this paper, we present an advanced solution for the long standing problem of large peak to average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. Although the design of low PAPR codewords has been extensively studied and the existence of asymptotically good codes with low PAPR is also proven, still no code has been constructed to satisfy all requirements. The main goal of the paper is to develop a coding scheme that not only generates low PAPR codewords, but it also performs relatively close to the Shannon limit. We achieve this goal by implementing a time-frequency turbo block coded OFDM. In this scheme, we design the frequency domain component to have a tightly bounded PAPR. The time domain component code is designed to obtain good performance while the decoding algorithm has reasonable complexity. Through comparative performance evaluation we show that utilizing the proposed method, we achieve considerable improvement in terms of PAPR while we slightly loose the performance compared to capacity achieving codes with similar overall block length.