Generalized Precoding-Aided Spatial Modulation via Receive Antenna Transition

Receive antenna transition, which implies the transition of the active receive antennas during a symbol period, is investigated in this letter to enhance the error performance of the generalized precoding-aided spatial modulation (GPSM). Specifically, the precoding at the transmitter alters once at the midpoint of a symbol duration such that one group of active receive antennas transfers to another group. The antenna transition pattern is then capable to deliver extra spatial information bits. The proposed GPSM scheme has two main advantages. First, the system reliability is remarkably improved. Second, it requires less receive antennas to achieve the same spectral efficiency compared with the existing precoding-aided spatial modulation (PSM) and GPSM schemes. An analytical upper bound on average bit error probability of the proposed scheme is derived by exploring the Wishart distribution feature of the channel matrix and the Gamma approximation. Numerical results validate our analysis and show that the proposed scheme outperforms the existing PSM and GPSM schemes in terms of system reliability.