Abstract
Recently, a novel spatial modulation (SM) scheme; termed Mid-symbol Antenna transition (MAT) spatial modulation, was developed to reduce the number of utilized transmitting antennas and improve the average bit error rate (ABER) performance. In this paper, the structure of the original MAT is extended to adapt Double-antenna transitions (DAT) during the symbol's transmission duration. Compared to the mid-symbol antenna-transition (MAT), the DAT scheme allows more reduction in the number of required transmitter antennas (TAs) and more enhancement of ABER performance, while achieving the same spectral efficiency (SE). DAT scheme reduces receiver complexity in comparison with generic SM, generalized SM (GSM), variable generalized SM (VGSM), and MAT schemes. The detailed DAT system design is presented. Furthermore, the theoretical closed-form of the ABER upper bound of the DAT system is quantified. The validity of the derived ABER upper bound is proved by contrasting it with the simulated ABER. Monte-Carlo simulations are utilized to evaluate the ABER of the DAT scheme over nakagami-m fading channels with respect to competing schemes. Furthermore, we study the impact of the spatial correlation on the considered schemes and the impact of varying nakagami-m factor on the performance of the DAT scheme. Our simulations demonstrate that DAT significantly outperforms the aforementioned rival schemes in terms of the average bit error rate (ABER) performance.
Highlights
Future wireless networks are required to provide a significant capacity increase compared to the already existing wireless networks so as to cope with the expected tremendous growth of data traffic
The impact of mnk ; the factor of the nakagami-m fading channel, on the average bit error rate (ABER) performance of the Double-antenna transitions (DAT) scheme over correlated and uncorrelated nakagami-m channels is studied at different values
The DAT scheme introduces reductions in receiver complexity compared to mid-symbol antenna-transition (MAT), spatial modulation (SM), generalized SM (GSM), and variable generalized SM (VGSM) schemes
Summary
Future wireless networks are required to provide a significant capacity increase compared to the already existing wireless networks so as to cope with the expected tremendous growth of data traffic. The VGSM scheme introduces more reduction in the number of utilized TAs, its ABER performance is degraded as compared to SM and GSM. The spatial information is carried on the transition of the active TA rather than the indices of active TAs. The MAT scheme performs better than SM, GSM, and VGSM in terms of ABER performance. It is worthy to mention that DAT provides a reduced number of utilized TAs and improved ABER performance better than SM without a need for a two-stage decoding process at the receiver compared to ESM. The DAT scheme reduces the required number of transmitter antennas and improves the ABER performance compared to MAT, SM, GSM, and VGSM schemes. The ABER performance of the DAT scheme over nakagami-m fading channels is evaluated by benchmarking it against MAT, SM, GSM, and VGSM schemes using Monte-Carlo simulations.
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