Journal of Communications
For a Time-Hopping (TH) Pulse Position Modulation (PPM) based Ultra-WideBand (UWB) multi-antenna system, the authors propose four coherent Space-Time (ST) diversity schemes, corresponding to which the correlation template signals with blind channel estimation are also presented. First of all, the issue of channel identifiability based on first-order statistics is addressed, aspired by the single-antenna case. Then, they shed light on that the determination of space-time structure is related to both channel estimation and signal detection. After that, four ST diversity structures are presented to guarantee both the feasibility of blind channel estimation and no multi-antenna interference introduced into signal detection.