吉林大学学报(工学版) ›› 2011, Vol. 41 ›› Issue (4): 1146-1150.

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Optimal pilot spacing for adaptive orthogonal frequency division multiplexing systems

LU Ji1|XIAO Song1|WU Cheng-ke1|GUO Kai2   

  1. 1.National ISN Key Laboratory, Xidian University, Xi'an 710071, China|2.Aerospace Long March Launch Vehicle Technology Co.Ltd,Beijing 100076,China
  • Received:2009-09-23 Online:2011-07-01 Published:2011-07-01

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Abstract:

A pilot spacing design method is proposed, which can maximize the average spectral efficiency. Based on the adaptive Orthogonal Frequency Division Multiplexing (OFDM) systems, the impact of channel estimation on Bit-error Rate (BER) is analyzed. On the constraint of an instantaneous BER, a formula for average spectral efficiency as a function of pilot spacing is derived based on which the optimal pilot spacing is designed. Simulation results show that the optimal pilot spacing is related to Signal-to-Noise Ratio (SNR) and coherence bandwidth, and the validity of the proposed method is verified under different channel models.

Key words: communication, orthogonal frequency division multiplexing(OFDM), pilot design, adaptive modulation, channel estimation error, spectral efficiency

CLC Number: 

  • TN929.5
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