An OFDM signal transmitted from an OFDM transmitter, the signal having a payload portion comprising a first number of data symbols and a second number of padding symbols such that the combined number of data symbols and padding symbols equates to an integer number of OFDM symbols and wherein the padding...http://www.google.com/patents/US20060268671?utm_source=gb-gplus-sharePatent US20060268671 - Efficient channel tracking in packet based OFDM systems
