Receive Antenna Shift Keying
Source: Orange Labs
Wireless communication systems based on Time Reversal (TR) and a Single Tap Receiver (STR) are optimum at low Signal-to-Noise Ratio (SNR), while keeping low complexity at the receiver. Thus, they are interesting for low order Phase and Amplitude Modulations, such as Binary Phase Shift Keying (BPSK) or Quadrature Phase Shift Keying (QPSK). However, at higher Signal to Noise Ratio, Inter-Symbol Interference prevents from using higher order modulations such as 16 Quadrature Amplitude Modulation (16QAM) or 64QAM. This paper presents a new spatial modulation technique called Received Antenna Shift Keying (RASK), enabling the use of higher order modulation with TR and STR. Information is not conveyed by Phase and Amplitude Modulation (PAM).