TY - JOUR
T1 - Information Guided Precoding for OFDM
AU - Li, Qiang
AU - Wen, Miaowen
AU - Poor, H. Vincent
AU - Chen, Fangjiong
N1 - Funding Information:
This work was supported in part by the National Natural Science Foundation of China under Grant 61671211, in part by the Natural Science Foundation of Guangdong Province under Grant 2016A030311024, in part by the State Major Science and Technology Special Projects under Grant 2016ZX03001009 and Grant 2017ZX03001001, and in part by KAUST under Grant OSR-2016-CRG5-2958-02.
Publisher Copyright:
© 2013 IEEE.
PY - 2017/8/9
Y1 - 2017/8/9
N2 - In conventional orthogonal frequency division multiplexing with index modulation (OFDM-IM), the M-Ary modulated symbols are transmitted on a subset of subcarriers under the guidance of information bits. In this paper, a novel information guided precoding technique, called precoding aided (P-) OFDM-IM, is proposed to improve the spectral efficiency (SE) of OFDM-IM. In P-OFDM-IM, the information bits are jointly conveyed through the conventional M-Ary modulated symbols and the indices of precoding matrices and vectors. The P-OFDM-IM principle is embodied in two different implementations, P-OFDM-IM-I and P-OFDM-IM-II. Specifically, P-OFDM-IM-I divides all subcarriers into L groups and modulates them using $L distinguishable constellations. P-OFDM-IM-II partitions the set of all subcarriers into L overlapping layers and performs IM layer by layer, where distinguishable constellations are employed across layers. A practical precoding strategy is designed for P-OFDM-IM under the phase shift keying/quadrature amplitude modulation constraint. A low-complexity log-likelihood ratio detector is proposed to ease the computational burden on the receiver. To evaluate the performance of P-OFDM-IM analytically, an upper bound on the bit error rate and the achievable rate is studied. Computer simulation results show that P-OFDM-IM-I outperforms the existing OFDM-IM-related schemes at high SE, while P-OFDM-IM-II performs the best at low SE.
AB - In conventional orthogonal frequency division multiplexing with index modulation (OFDM-IM), the M-Ary modulated symbols are transmitted on a subset of subcarriers under the guidance of information bits. In this paper, a novel information guided precoding technique, called precoding aided (P-) OFDM-IM, is proposed to improve the spectral efficiency (SE) of OFDM-IM. In P-OFDM-IM, the information bits are jointly conveyed through the conventional M-Ary modulated symbols and the indices of precoding matrices and vectors. The P-OFDM-IM principle is embodied in two different implementations, P-OFDM-IM-I and P-OFDM-IM-II. Specifically, P-OFDM-IM-I divides all subcarriers into L groups and modulates them using $L distinguishable constellations. P-OFDM-IM-II partitions the set of all subcarriers into L overlapping layers and performs IM layer by layer, where distinguishable constellations are employed across layers. A practical precoding strategy is designed for P-OFDM-IM under the phase shift keying/quadrature amplitude modulation constraint. A low-complexity log-likelihood ratio detector is proposed to ease the computational burden on the receiver. To evaluate the performance of P-OFDM-IM analytically, an upper bound on the bit error rate and the achievable rate is studied. Computer simulation results show that P-OFDM-IM-I outperforms the existing OFDM-IM-related schemes at high SE, while P-OFDM-IM-II performs the best at low SE.
KW - OFDM
KW - index modulation
KW - log-likelihood ratio (LLR)
KW - maximum-likelihood (ML)
KW - precoding
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U2 - 10.1109/ACCESS.2017.2737640
DO - 10.1109/ACCESS.2017.2737640
M3 - Article
AN - SCOPUS:85028967694
SN - 2169-3536
VL - 5
SP - 19644
EP - 19656
JO - IEEE Access
JF - IEEE Access
M1 - 8006223
ER -