2 research outputs found
Spectrally Efficient FDM over Satellite Systems with Advanced Interference Cancellation
For high data rates satellite systems, where multiple carriers are frequency division multiplexed with a slight overlap,
the overall spectral efficiency is limited. This work applies highly overlapped carriers for satellite broadcast and broadband scenarios
to achieve higher spectral efficiency. Spectrally efficient frequency division multiplexing (SEFDM) compresses subcarrier
spacing to increase the spectral efficiency at the expense of orthogonality violation. SEFDM systems performance degrades compared
to orthogonal signals, unless efficient interference cancellation is used. Turbo equalisation with interference cancellation
is implemented to improve receiver performance for variable coding, compression and modulation/constellation proposals that
may be applied in satellite communications settings. Such parameters may be set to satisfy pre-defined spectral efficiency values
for a given quality index (QI) or associated application. Assuming LDPC coded data, the work proposes two approaches to
receiver design; a simple matched filter approach and an approach utilising an iterative interference cancellation structure specially
designed for SEFDM. Mathematical models and simulations studies are presented indicating promising gains to be achieved for
SEFDM transmission with advanced transceiver architectures at the cost of increased complexity at the receiver