Patent ID: 6674810
Filing Date: 2004-01-06
Classification: H04B,H04L

Abstract:
In a discrete multi-tone transceiver, a method for reducing peak-to-average power ratio in a transmit signal, comprising the steps of:interpolating a discrete multi-tone signal to produce an interpolated discrete multi-tone signal; determining whether a peak magnitude exceeds a pre-determined magnitude parameter, wherein the peak magnitude is associated with either of the discrete multi-tone signal or the interpolated discrete multi-tone signal; adding a shaping signal to the interpolated discrete multi-tone signal to produce a modified signal, in response to determining that the peak magnitude exceeds the pre-determined magnitude parameter, wherein the shaping signal consists entirely of tones located outside a transmission band allocated to the discrete multi-tone signal; converting the modified signal to an analog transmit signal; and canceling feedback tones introduced to a receive signal within the discrete multi-tone transceiver, wherein the feedback tones are associated with the shaping signal.