Journal of Applied Sciences ›› 2012, Vol. 30 ›› Issue (5): 441-447.doi: 10.3969/j.issn.0255-8297.2012.05.001

• Communication Engineering • Previous Articles     Next Articles

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

SONG Lei1, LI Li-hua1, GAO Xiang-chuan2, PEI Yu-shan1, WANG Hua-lei1     

  1. 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:2011-03-23 Revised:2011-07-12 Online:2012-09-24 Published:2012-09-25

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

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