Patent ID: 7295509

Claim:
A communication device for use in a communications system that uses multiple tones distributed over a predetermined bandwidth to communicate data, the device comprising: a mapping circuit that receives data symbols and maps the symbols to prescribed time instants in a predetermined time interval to generate a discrete signal including mapped symbols, each mapped symbol corresponding to a discrete point in time; an interpolation circuit that receives the discrete signal and generates a continuous signal by applying an interpolation function to the discrete signal, the interpolation function operating on the discrete signal such that a frequency response of the continuous signal includes sinusoids having non-zero values at a first set of tones, the first set of tones being a subset of said multiple tones, the non-zero value at each of said first set of tones being a function of a plurality of mapped symbols corresponding to different discrete points in time, the frequency response of the continuous signal also including zero values at a second set of tones, the second set of tones being different from said first set of tones and being another subset of said multiple tones; and a cyclic prefix circuit located after the interpolation circuit to prepend a cyclic prefix.