NDLI: Average error rate analysis for pilot-aided OFDM receivers with frequency-domain interpolation

Content Provider	IEEE Xplore Digital Library
Author	Mostofi, Y. Cox, D.C.
Copyright Year	2004
Description	Author affiliation: Dept. of Electr. Eng., Stanford Univ., CA, USA (Mostofi, Y.)
Abstract	In OFDM receivers, pilot tones should be inserted among the sub-carriers in order to estimate the channel in high delay spread environments. To estimate the channel at all the sub-carriers, using the pilot tones, different frequency-domain interpolators can be used. For a given number of pilot tones, these interpolators will have different levels of complexity depending on the number of adjacent pilot tones that they use to estimate the channel at each sub-carrier. For high delay-spread channels, as the number of adjacent pilot tones used by an interpolator increases, channel estimation improves resulting in a tradeoff between performance and complexity. In this paper, we first find an analytical average error rate formula for a pilot-aided OFDM receiver in a delay spread fading environment. This analysis will provide a framework to evaluate the performance of different interpolators. As an example, we then evaluate and compare the performance of two interpolators with different levels of complexity: a trigonometric interpolator and a linear one. We derive the average error rate formulas of the interpolators and confirm that the former one has a considerably better performance as the delay spread increases. However, for flat fading channels, we show that the linear interpolator has a 3 dB gain. Finally, our simulation results support the mathematical analysis and comparison.
Starting Page	1421
Ending Page	1425
File Size	293452
Page Count	5
File Format	PDF
ISBN	0780383443
ISSN	15253511
DOI	10.1109/WCNC.2004.1311651
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-03-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Error analysis OFDM Frequency domain analysis Interpolation Delay estimation Fading Frequency estimation Channel estimation Performance analysis Gain
Content Type	Text
Resource Type	Article

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