Paper Info
Title
Layered Orthogonal Frequency Division Multiplexing With Index Modulation
Abstract
In this paper, we propose a novel scheme termed layered orthogonal frequency division multiplexing with index modulation (L-OFDM-IM) to increase the spectral efficiency (SE) of OFDM-IM systems. In L-OFDM-IM, all subcarriers are first divided into multiple layers, each determining the active subcarriers and their modulated symbols. The index modulation (IM) bits are carried on the indices of the active subcarriers of all layers, which are overlapped and distinguishable with different signal constellations so that the number of the IM bits is larger than that in traditional OFDM-IM. A low-complexity detection is proposed to alleviate the high burden of the optimal maximum-likelihood detection at the receiver side. A closed-form upper bound on the bit error rate, the achievable rate, and diversity order are derived to characterize the performance of L-OFDM-IM. To enhance the diversity performance of L-OFDM-IM, we further propose coordinate interleaving L-OFDM-IM (CI-L-OFDM-IM), which interleaves the real and imaginary parts of the modulated symbols over two different subchannels. Computer simulations verify the theoretical analysis, and results show that L-OFDM-IM outperforms the conventional OFDM-IM scheme. Moreover, it is also confirmed that CI-L-OFDM-IM obtains an additional diversity order in comparison with L-OFDM-IM.
Year
DOI
Venue
2019
10.1109/JSYST.2019.2918068
IEEE Systems Journal
Keywords
Field
DocType
OFDM,Modulation,Indexes,Bit error rate,Transmitting antennas,Upper bound
Computer science,Electronic engineering,Real-time computing,Modulation,Orthogonal frequency-division multiplexing
Journal
Volume
Issue
ISSN
13
4
1932-8184
Citations 
PageRank 
References 
6
0.47
0
Authors
6
Name
Order
Citations
PageRank
Jun Li111712.58
Shuping Dang27712.76
Miaowen Wen386681.12
Xueqin Jiang413333.57
Yuyang Peng5244.19
Han Hai6152.97