ML estimation of time and frequency offset in OFDM systems
IEEE Transactions on Signal Processing
Filtered multitone modulation for very high-speed digital subscriber lines
IEEE Journal on Selected Areas in Communications
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In this paper we formulate OFDM signals based on explicit pulse shaping filtering. A rectangular pulse in time domain for shaping filtering is most often used, but it has SNR loss compared to a shaping filter with a brick-wall frequency domain filter since in practice both require guard time or guard band. Our formulation of OFDM signal based purely on shaping filter may provide a common platform, and both can be implemented efficiently using DFT and commutating polyphase filters.