Symbol Cyclic Shift Equalization PAM-OFDM-A Low Complexity CP-Free OFDM Scheme

Xi Qing Liu, Hsiao Hwa Chen, Bo Yu Lyu, Wei Xiao Meng

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


In traditional orthogonal frequency division multiplexing (OFDM) systems, a cyclic prefix (CP) must be used in every block for intersymbol interference (ISI) suppression in time-dispersive channels at a price of severely impaired spectrum efficiency. To deal with this issue, the symbol cyclic shift equalization (SCSE) algorithm was proposed to implement a CP-free OFDM system. In this paper, we aim to further reduce the computational complexity of the SCSE algorithm. In particular, a pulse amplitude modulation (PAM) is used at a transmitter to construct conjugate symmetric OFDM blocks, while only partial samples in an OFDM block are involved in the SCSE algorithm at the receiver side, leading to a significantly reduced implementation complexity if compared to an SCSE quadratic-amplitude modulation(QAM)/phase-shift keying (PSK)-OFDM system, where all samples in an OFDM block must be involved in the detection process. The performance of the proposed SCSE PAM-OFDM scheme is analyzed and compared to traditional OFDM systems. The results obtained from this paper verify the effectiveness of the proposed scheme.

Original languageEnglish
Article number7763883
Pages (from-to)5933-5946
Number of pages14
JournalIEEE Transactions on Vehicular Technology
Issue number7
Publication statusPublished - 2017 Jul

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics


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