Decision feedback scheme for spatial modulation

Spatial Modulation (SM) is a newly developed Multiple Input Multiple Output (MIMO) technique where the antenna/spatial constellation is used as an information carrying unit in addition to the modulation constellation. Traditional SM techniques rely on periodic insertion of the pilot symbols to estimate the channel state information; however, it reduces the effective throughput. A differential SM (DSM) technique was developed to circumvent the need of channel estimation altogether. However, the computational complexity of the DSM increases exponentially with the increase of antennas and becomes impractical even for a moderate antenna array. In this scenario a novel clustering based decision feedback (CB-DFB) scheme is proposed in this thesis which similar to DSM does not require any pilot symbols, and yet has a very low complexity. A generalized CB-DFB scheme is later proposed which further overcomes the constraints of traditional SM techniques and increases the overall throughput.