Abstract
In recent years, multi-input multi-output(MIMO) antenna is becoming a important wireless communication technology and several standard have incorporated MIMO technique such as LTE and Wi-Fi. Massive MIMO is a MIMO system with large-scale antenna which improves the scattering environment, spectral efficiency and the link reliability. To exploit the advantage of massive MIMO, Index Modulation (IM) becomes a potential scheme for the next generation communication system. Index Modulation (IM) improves the energy efficiency and provides flexible system parameter to meet different application demands. Spatial Modulation (SM) and orthogonal frequency division multiplexing-index modulation (OFDM-IM) are two kind of IM. The former applies “index” in dimension of antennas, and OFDM-IM is applied in dimension of subcarriers. We modify SM and combine the features of OFDM-IM, beamforming technology and MIMO systems to propose IM technologies named as “Bean-Frequency Index Modulation” (BFIM) and “Differential Bean- Frequency Index Modulation” (D-BFIM). We apply analysis of energy and spectral efficiency of BFIM scheme and compare the bit error rate (BER) performance with conventional MIMO. Our results show that BFIM and D-BFIM have a better energy efficiency, and have a good BER performance in the high SNR region. To make a flexible system, we also provide a design rule for BFIM to choose and meet the different requirements.