Multirate systems and filter banks
Multirate systems and filter banks
Window designs for DFT-based multicarrier systems
IEEE Transactions on Signal Processing
Dynamic spectrum management for next-generation DSL systems
IEEE Communications Magazine
Electromagnetic coupling of twisted pair cables
IEEE Journal on Selected Areas in Communications
Receiver window design for multicarrier communication systems
IEEE Journal on Selected Areas in Communications
Pairwise subcarriers weighting for suppressing out-of-band radiation of OFDM
International Journal of Communication Systems
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Discrete multitone (DMT) uses an inverse discrete Fourier transform (IDFT) to modulate data on the carriers. The high sidelobes of the IDFT filter bank used can lead to spurious emissions (egress) in unauthorized frequency bands. Applying a window function within the DMT symbol can alleviate this. However, window functions either require additional redundancy or will introduce distortions that are generally not easy to compensate for. In this paper, a special class of window functions is constructed that corresponds to a precoding at the transmitter. These do not require any additional redundancy and need only a modest amount of additional processing at the receiver. The results can be used to increase the spectral containment of DMT-based wired communications such as ADSL and VDSL (i.e., asymmetric, resp., very-high-bitrate digital subscriber loop).