An overview of OFDM and related techniques towards development of future wireless multimedia communications

Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI:10.1109/RAWCON.2002.1030107

F. B. Frederiksen, R. Prasad

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引用次数: 84

Abstract

In future wireless broadband communication systems, to meet demands, data rates are expected to exceed several Mbps. Consequently, the delay time of the delayed waves can typically become greater than the duration of one symbol and delay spread handling by traditional adaptive equalization is not an easy task. OFDM (orthogonal frequency division multiplexing) is a spectrum efficient kind of multicarrier transmission. Using OFDM-techniques makes it possible to reduce the effects of multipath fading and thus complex equalizers at the receiver side can be avoided. The principles, technology and limits of OFDM are introduced and discussed. Special attention is given to SNR-problems and to synchronization in time and frequency at the receiver. OFDM is a strong candidate for the future generation of wireless communications. The performance of an OFDM-based system is limited by the system speed and the synchronization-ability and also by the given antenna concept. Thus the required future communication performance is not obtained only by improvements of the OFDM-concept but also by advanced diversity techniques and adaptive antenna technology.

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概述了OFDM及其对未来无线多媒体通信发展的相关技术

在未来的无线宽带通信系统中，为了满足需求，数据速率有望超过几Mbps。因此，延迟波的延迟时间通常会大于一个符号的持续时间，传统的自适应均衡处理延迟扩展不是一件容易的事情。正交频分复用是一种频谱高效的多载波传输方式。使用ofdm技术可以减少多径衰落的影响，从而可以避免在接收端使用复杂的均衡器。介绍并讨论了OFDM的原理、技术和局限性。特别注意的是信噪比问题和同步的时间和频率在接收机。OFDM是未来一代无线通信的有力候选。基于ofdm的系统的性能受到系统速度和同步能力以及给定天线概念的限制。因此，未来所需的通信性能不仅需要改进ofdm概念，还需要采用先进的分集技术和自适应天线技术。

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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Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)

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