TY - JOUR
T1 - Symbol Cyclic Shift Equalization PAM-OFDM-A Low Complexity CP-Free OFDM Scheme
AU - Liu, Xi Qing
AU - Chen, Hsiao Hwa
AU - Lyu, Bo Yu
AU - Meng, Wei Xiao
N1 - Funding Information:
Manuscript received June 11, 2016; revised September 29, 2016 and November 10, 2016; accepted November 28, 2016. Date of publication December 1, 2016; date of current version July 14, 2017. This work was supported in part by the National Natural Science Foundation of China (No. 61671186 and No. 61471143) and in part by Taiwan Ministry of Science and Technology (No. 99-2221-E-006-016-MY3 and No. 104-2221-E-006-081-MY2). The review of this paper was coordinated by Dr. D. Marabissi.
Publisher Copyright:
© 1967-2012 IEEE.
PY - 2017/7
Y1 - 2017/7
N2 - 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.
AB - 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.
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U2 - 10.1109/TVT.2016.2635032
DO - 10.1109/TVT.2016.2635032
M3 - Article
AN - SCOPUS:85029607849
VL - 66
SP - 5933
EP - 5946
JO - IEEE Transactions on Vehicular Communications
JF - IEEE Transactions on Vehicular Communications
SN - 0018-9545
IS - 7
M1 - 7763883
ER -