Linear phase interpolation in frequency domain for multicarrier CDMA systems using block-type pilot arrangement

Abstract

多载波CDMA系统结合了正交频分复用(OFDM)技术和CDMA技术的优点,自1993年提出以来就受到了广泛的重视。本文主要讨论载波频偏对连续OFDM符号的影响,提出了一种新的频域线性相位内插算法来估计信道响应,以对抗载波频偏对连续OFDM符号引起的相位旋转。理论分析和仿真试验都证明我们提出的算法能有效减少载波频偏对系统性能的影响。这种新算法适用于使用导频信号块状分布的多载波CDMA系统或OFDM系统。 A multicarrier CDMA system combines the advantages of an orthogonal frequency division multiplexing (OFDM) scheme with those of a CDMA scheme. Much attention has been paid to the MC-CDMA system since it was proposed in 1993. In this paper, effects caused by carrier frequency offset over successive OFDM symbols are investigated. A novel linear phase interpolation method is proposed to combat phase rotation problem when block-type pilot arrangement is used in a MC-CDMA system. Analysis and computer simulation show that the proposed scheme effectively reduces thenegative impact of carrier frequency offset on system performance.