A coded frequency-domain link adaptation scheme for OFDM transmission in TDD mode

2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754) Pub Date : 2004-09-05 DOI:10.1109/PIMRC.2004.1368365

M. Lei, H. Harada, H. Wakana, Ping Zhang

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引用次数: 1

Abstract

The link adaptation scheme in the current orthogonal frequency division multiplexing (OFDM) systems such as IEEE802.11a only consider the channel variation in the time-domain, and assume all the data subcarriers use the same modulation mode and transmit power once the data rate is determined. However, in the frequency-selective fading environments, the error probability performance of OFDM is severely degraded by the subcarriers where the deep fading occurs. In order to deal with this issue, we propose a coded frequency-domain link adaptation scheme for OFDM packet transmission in the time division duplex (TDD) mode. This scheme is based on the concatenation of the channel coding and the adaptive bit and power loading. The simulation results show the proposed scheme can significantly improve the packet error rate (PER) performance compared with other schemes. Further investigations also show that it can contribute to large performance gain even in the challenging high-speed environments.

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一种在TDD模式下OFDM传输的编码频域链路自适应方案

当前IEEE802.11a等正交频分复用(OFDM)系统中的链路自适应方案只考虑信道在时域上的变化，并假设所有数据子载波在数据速率确定后使用相同的调制方式和发射功率。然而，在频率选择性衰落环境下，OFDM的误码率性能受到子载波深度衰落的严重影响。为了解决这一问题，提出了一种时分双工(TDD)模式下OFDM分组传输的编码频域链路自适应方案。该方案基于信道编码的级联以及自适应的比特和功率负载。仿真结果表明，与其他方案相比，该方案能显著提高包错误率(PER)性能。进一步的研究还表明，即使在具有挑战性的高速环境中，它也可以大大提高性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)

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