Abstract :
Spatial modulation (SM) has been studied extensively to exploit multiple transmit antennas over a multiple-input multiple-output (MIMO) channel. Since one transmit antenna is used at a time in SM, there is no inter-channel interference (ICI), which results in a low detection complexity, while additional bits can be transmitted by the antenna selection. In this paper, we propose the signal dependent antenna (SDA) mapping approach for SM to achieve a mapping gain (at the cost of the throughput decrease) without any conventional channel coding schemes. Based on the performance analysis for SM, we derive design criteria for SDA mapping, and based on them, propose two specific mapping rules for 4 and 8 transmit antennas, which can provide asymptotic SNR gains of 4.77 and 6.98 dB, respectively.
Keywords :
MIMO communication; antenna arrays; modulation; signal detection; transmitting antennas; MIMO channel; SDA mapping approach; antenna selection; asymptotic SNR gains; detection complexity; mapping gain; multiple-input multiple-output channel; multiple-transmit antennas; signal-dependent antenna mapping; spatial modulation; Constellation diagram; Gain; Labeling; Signal to noise ratio; Transmitting antennas;
