| A family of waveforms for spectrally efficient serial concatenated
continuous phase modulation in frequency hopping systems is presented.
The proposed waveforms focus on narrowband tactical communication
systems and are shown to meet stringent spectral emission masks of
-40dBc at the band edges for terrestrial communications whilst
maintaining data rates up to 64Kbit/sec, in 25KHz bandwidth, compared
to 16Kbits/sec, typical of legacy systems. In addition, a design
approach is outlined enabling near-constant envelope waveforms for a
variety of user defined information rates thus enabling greater
efficiencies in transmitter power amplifier designs.
The receiver design incorporates a low complexity iterative
non-coherent detector accommodating multiple phase discontinuous hops
over an interleaver duration. Simulation results show that a family
of narrowband waveforms covering a variety of user data rates can be
generated whilst achieving good performance and spectral efficiency
for both tactical data and low latency voice communications.
Furthermore, channel sounding results illustrate the robustness of the
iterative receiver in measurement-based channel environments in the
VHF band.
|