Abstract
Advanced wireless communications to support high vehicular speeds in the scenario of intelligent mobility have attracted considerable research attentions in both academia and industry. Multi-dimensional index modulation, which exploits transmission media resources for combining the concept of index modulation to achieve higher throughput with lower energy consumption, is regarded as a potential candidate for addressing the challenges in intelligent mobility communications. However, for the multi-dimensional index modulation system used in the mobile environment, the inter-carrier-interference (ICI) imposes a significant adverse impact on the system, especially in the context of multicarrier transmission. Therefore, by focusing on the two-dimensional index modulation system, the ICI impact on space-frequency index modulation is studied in this paper. Thanks to the grouping strategies and the Gaussian approximation to model the ICI, the approximate theoretical bounds for the error performance of the two dimensional systems are derived. Moreover, a novel robust space-frequency index modulation scheme is also developed. Finally, simulation results are presented to validate the system performances and the theoretical derivations.
Highlights
Future wireless communications are required to meet the needs of intelligent mobility, which requires high-volume and reliable data connections under high speed mobility
Extreme challenge, as the 3GPP members have agreed to inherit the legacy of 4G and continue to utilize the orthogonal frequency-division multiplexing (OFDM) as the modulation scheme [4], [5], which is sensitive to the carrier frequency offset (CFO) [6]–[9]
The results show that the MIMO-OFDM-index modulation (IM) system is able to improve the spectral efficiency compared to OFDM-IM systems and outperforms the conventional MIMO-OFDM system in terms of bit error rate (BER)
Summary
Future wireless communications are required to meet the needs of intelligent mobility, which requires high-volume and reliable data connections under high speed mobility. The CFO incurred by high mobility may degrade the system performance significantly and the situation would be even worse if mmWave technology is deployed with carrier frequencies as high as 100 GHz [10]–[13] How to address this challenge while utilizing existing wireless communication infrastructure is still an open issue. The MIMO-OFDM-IM system has not fully exploited the index resource across the spatial and frequency domains, since it only uses the indices on the frequency domain to carry additional information bits and treats the transmit antenna independently when designing the transmit patterns. Based on the analysis results, a novel index pattern generation scheme is proposed, which avoids activating the adjacent subcarriers in a group for each transmission, the theoretical and simulation results show that the proposed scheme can improve the error performance of the system under CFO effectively.
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