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Journal of Applied Sciences >

2012 , Vol. 30 >Issue 5: 441 - 447

DOI: https://doi.org/10.3969/j.issn.0255-8297.2012.05.001

Communication Engineering

Effect of Imperfect Frame Synchronization on Linear Interpolation of Amplititude and Phase

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  • 1. Key Laboratory of Universal Wireless Communications, Ministry of Education,
    Beijing University of Posts and Telecommunications, Beijing 100876, China
    2. School of Information Engineering, Zhengzhou University, Zhengzhou 450001, China

Received date: 2011-03-23

  Revised date: 2011-07-12

  Online published: 2012-09-25

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Abstract

In orthogonal frequency division multiplexing (OFDM) systems, a common interpolation method is the linear interpolation in in-phase and quadrature components (I-Q interpolation). Linear interpolation of amplitude and phase (A-P interpolation) is rarely used in practice since it is inferior to I-Q interpolation in terms of performance and computational complexity. For imperfect frame synchronization,  the effect of cyclic prefix (CP) removal prior to the A-P interpolation is studied and compared with I-Q interpolation. A universal expression of mean square error in A-P and I-Q interpolations is given. Analyses show that A-P interpolation mainly depends on frequency correlation of the channels, and is less affected by preact of CP removal, while
I-Q interpolation is affected by both frequency correlation of the channels and preact of CP removal. Thus, A-P interpolation can also be used when the synchronization performance is poor.

Key words： orthogonal frequency division multiplexing (OFDM); I-Q interpolation; A-P interpolation; cyclic prefix

Cite this article

SONG Lei1, LI Li-hua1, GAO Xiang-chuan2, PEI Yu-shan1, WANG Hua-lei1 . Effect of Imperfect Frame Synchronization on Linear Interpolation of Amplititude and Phase[J]. Journal of Applied Sciences, 2012 , 30(5) : 441 -447 . DOI: 10.3969/j.issn.0255-8297.2012.05.001

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