Online Publication Date2017-08-09
Print Publication Date2017
Permanent link to this recordhttp://hdl.handle.net/10754/625801
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AbstractIn the 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, called precoding aided (P-)OFDMIM, is proposed to improve the spectral efficiency (SE) of OFDMIM. 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. Then, the principle of P-OFDM-IM is embodied in two different implementation types, including P-OFDM-IM-I and P-OFDM-IM-II. Specifically, P-OFDM-IM-I divides all subcarriers into L groups and modulates them by L distinguishable constellations. P-OFDM-IM-II partitions the total subcarriers into L overlapped 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 theoretically, an upper bound on the bit error rate and the achievable rate are 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.
CitationLi Q, Wen M, Poor HV, Chen F (2017) Information Guided Precoding for OFDM. IEEE Access: 1–1. Available: http://dx.doi.org/10.1109/access.2017.2737640.
SponsorsThis work was supported in part by the National Natural Science Foundation of China under Grants 61501190 and 61671211, and by the Natural Science Foundation of Guangdong Province under Grants 2014A030310389 and 2016A030311024. The work of H. V. Poor was supported by KAUST Grant No. OSR-2016-CRG5-2958-02.