Abstract
In this paper, we propose a novel codebook design scheme for orthogonal frequency-division multiplexing with index modulation (OFDM-IM) to improve system performance. The optimization process can be implemented efficiently by the lexicographic ordering principle. By applying the proposed codebook design, all subcarrier activation patterns with a fixed number of active subcarriers will be explored. Furthermore, as the number of active subcarriers is fixed, the computational complexity for estimation at the receiver is reduced and the zero-active subcarrier dilemma is solved without involving complex higher layer transmission protocols. It is found that the codebook design can potentially provide a tradeoff between diversity and transmission rate. We investigate the diversity mechanism and formulate three diversity-rate optimization problems for the proposed OFDM-IM system. Based on the genetic algorithm, the method of solving these formulated optimization problems is provided and verified to be effective. Then, we analyze the average block error rate and bit error rate of the OFDM-IM systems applying the codebook design. Finally, all analyses are numerically verified by the Monte Carlo simulations. In addition, a series of comparisons are provided, by which the superiority of the codebook design is confirmed.
Highlights
O RTHOGONAL frequency-division multiplexing (OFDM) has occupied a crucial position in modern wireless communication networks, since the popularization of fourth generation (4G) networks [1]
The contributions of this paper are listed as follows: 1) We propose a codebook design scheme for orthogonal frequency-division multiplexing with index modulation (OFDM-IM) based on the lexicographic ordering principle
NUMERICAL RESULTS we first check the effectiveness of the solutions to the optimization problems provided by the GA compared to the optimal results provided by the brute-force method
Summary
O RTHOGONAL frequency-division multiplexing (OFDM) has occupied a crucial position in modern wireless communication networks, since the popularization of fourth generation (4G) networks [1]. OFDM utilizes a set of subcarriers with different orthogonal frequencies to split a frequency-selective channel into a number of frequency-flat subchannels. Because of the orthogonality of subcarrier frequencies, the subchannels. Manuscript received April 4, 2018; revised October 2, 2018; accepted October 15, 2018. Date of publication November 1, 2018; date of current version December 10, 2018. The associate editor coordinating the review of this paper and approving it for publication was S.
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