A novel carrier frequency offset tracking scheme in MQAM-OFDM systems

  • Authors:

  • Lijun Ge;Yingxin Zhao;Yu'ang Jin;Wenqi Li;Hong Wu

  • Affiliations:

  • Department of Communication Engineering, College of Information Technical Science, Nankai University, Tianjin, China;Department of Communication Engineering, College of Information Technical Science, Nankai University, Tianjin, China;Department of Communication Engineering, College of Information Technical Science, Nankai University, Tianjin, China;Department of Communication Engineering, College of Information Technical Science, Nankai University, Tianjin, China;Department of Communication Engineering, College of Information Technical Science, Nankai University, Tianjin, China

  • Venue:
  • WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
  • Year:
  • 2009

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Abstract

A novel carrier frequency offset tracking scheme for Multilevel Quadrature Amplitude Modulation-Orthogonal Frequency Division Multiplexing (MQAM-OFDM) systems is proposed using a designed conjugate code composed of MQAM mapping values and their complex conjugates which can also reduce Peak-to-Average Power Ratio (PAPR). The peak power is reduced by phase cancellation in the conjugate pairs avoiding accumulation of too much same phase subcarriers. A likelihood function is deduced from the conjugate code to estimate the phase offset caused by Carrier Frequency Offset (CFO). A novel Multicarrier Phase Locked Loop (MPLL) is described tracking the frequency offset in time and frequency domain. The algorithm performance was investigated in a designed system showing that the proposed scheme can reduce the PAPR of the system effectively and track the frequency offset in high precision.