  Spin torque nano-oscillators (STNO) are nanoscale devices with wide band
frequency tunability. Their multifunctional RF properties are well suited to
define novel schemes for wireless communications that use basic protocols for
data transmission such as amplitude, frequency and phase shift keying (ASK,
FSK, PSK). In contrast to ASK and FSK, implementation of PSK is more
challenging for STNOs because of their relatively high phase noise. Here we
introduce a special PSK technique by combining their modulation and injection
locking functionality. The concept is validated using magnetic tunnel junction
based vortex STNOs for injection locking at 2f and f/2 showing phase shifts up
to 2.1rad and data transmission rates up to 4Mbit/s. Quadrature phase shift
keying and analog phase modulation are also implemented, where the latter is
employed for voice transmission over a distance of 10 meters. This demonstrates
that STNO phase noise and output power meet the requested performances for
operation in existing communication schemes.
