Ioannis Kanaras

Learn More
In this paper, we investigate the possibility of reliable and computationally efficient detection for spectrally efficient non-orthogonal Multiplexing (FDM) system, exhibiting varying levels of intercarrier interference. Optimum detection is based on the Maximum Likelihood (ML) principle. However, ML is impractical due to its computational complexity. On(More)
Non-orthogonal Spectrally Efficient Frequency Division Multiplexing (SEFDM) signals of a small dimensionality can be optimally detected using the Sphere Decoder (SD) algorithm. However, the employment of such detectors is restricted by two factors; the ill-conditioning of the SEFDM projections matrix in the system linear statistical model and the(More)
Spectrally Efficient Frequency Division Multiplexing (SEFDM) systems aim to reduce the utilized spectrum by multiplexing non-orthogonal overlapped carriers. Since the per carrier transmission rate is maintained, SEFDM yields higher spectral efficiency relative to an equivalent Orthogonal Frequency Division Multiplexing (OFDM) system. Yet, due to the loss of(More)
This paper investigates the secure transmission of Orthogonal Frequency Division Multiplexing (OFDM) signals, masked under non-orthogonal FDM signals of approximately the same overall bandwidth. Carrier orthogonality of traditional OFDM is intentionally violated in order to generate an encrypted signal at the physical layer, without any loss in bandwidth(More)
Spectral efficiency is a key design issue for all wireless communication systems. Orthogonal frequency division multiplexing (OFDM) is a very well-known technique for efficient data transmission over many carriers overlapped in frequency. Recently, several papers have appeared which describe spectrally efficient variations of multi-carrier systems where the(More)
  • 1