  Conventional wireless information transfer by modulating the amplitude, phase
or frequency leads to an inevitable Rate-Energy (RE) trade-off in the presence
of simultaneous Wireless Power Transfer (WPT). In echoing Varshney's seminal
concept of jointly transmitting both information and energy, we propose the
so-called Generalised Precoded Spatial Modulation (GPSM) aided Integrated
Wireless Information and Power Transfer (IWIPT) concept employing a power-split
receiver. The principle of GPSM is that a particular subset of Receive Antennas
(RA) is activated and the activation pattern itself conveys useful information.
Hence, the novelty of our GPSM aided IWIPT concept is that RA pattern-based
information transfer is used in addition to the conventional waveform-based
information carried by the classic M-ary modulation. Following the Radio
Frequency (RF) to Direct Current (DC) power conversion invoked for WPT at the
power-split receiver, the non-coherent detector simply compares the remaining
received power accumulated by each legitimate RA pattern for the sake of
identifying the most likely RA. This operation is then followed by
down-conversion and conventional Base Band (BB) M-ary detection. Both our
analysis and simulations show that the RA pattern based information transfer
represented in the Spatial Domain (SD) exhibits a beneficial immunity to any
potential power conversion induced performance degradation and hence improves
the overall RE trade-off when additionally the waveform-based information
transfer is also taken into account. Moreover, we investigate the impact of
realistic imperfect Channel State Information at the Transmitter (CSIT) as well
as that of the antenna correlations encountered. Finally, the system's
asymptotic performance is characterised in the context of large-scale Multiple
Input Multiple Output (MIMO) systems.
