The impact of FFT size on the performance of a combined OFDM-equalization radio modem

Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI:10.1109/VETECF.1999.801545

S. Armour, A. Nix, D. Bull

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引用次数: 1

Abstract

Conventional OFDM systems employ a guard interval to combat delay spread distortion of transmitted data. This reduces the efficiency of the OFDM transmission. A combined OFDM-equalization transmission strategy is presented in this paper. This strategy employs an adaptive equalizer to combat delay spread distortion instead of a guard interval. This facilitates the use of very short guard intervals and thus the efficiency of the OFDM transmission is improved. This paper presents the combined OFDM-equalization techique and demonstrates the efficiency improvement that it offers over conventional OFDM. The performance of the pre-FFT equalizer is sensitive to time variation of the mobile radio channel's impulse response. Software simulation is employed to analyze this sensitivity and a relationship is determined between performance and FFT size. The results are considered in the context of application to existing and future mobile radio systems.

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FFT大小对组合式ofdm均衡无线电调制解调器性能的影响

传统的OFDM系统采用保护间隔来对抗传输数据的延迟扩展失真。这降低了OFDM传输的效率。提出了一种组合式ofdm均衡传输策略。该策略采用自适应均衡器来对抗延迟扩展失真，而不是采用保护间隔。这有利于使用非常短的保护间隔，从而提高了OFDM传输的效率。本文提出了一种组合式OFDM均衡技术，并论证了其相对于传统OFDM的效率提高。预fft均衡器的性能对移动无线信道脉冲响应的时变非常敏感。采用软件仿真来分析这种敏感性，并确定了性能与FFT大小之间的关系。研究结果将应用于现有和未来的移动无线电系统。

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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Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)

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