Patent ID: 6504862
Filing Date: 2003-01-07
Classification: H04B

Abstract:
A method of reducing the peak power probability of a spread spectrum baseband signal comprising clipping a first instance of the spread spectrum baseband signal to constrain it within error-shaped bounds by:a) generating a clipping threshold signal; b) generating a clipping error signal responsive to both the clipping threshold signal and the first instance of the spread spectrum baseband signal by: i) receiving a second instance of the baseband signal; ii) receiving a third instance of the baseband signal; iii) scaling the third instance of the baseband signal; and iv) subtracting the scaled third instance of the baseband signal from the second instance of the baseband signal; c) low pass filtering the clipping error signal to produce a shaped error signal; d) subtracting the shaped error signal from the first instance of the spread spectrum baseband signal; and e) delaying the first instance of the spread spectrum baseband signal to align its phase with the shaped error signal.