Front end processor for data receiver and nonlinear...

Details Front end processor for data receiver and nonlinear... Front end processor for data receiver and nonlinear...

2006-11-28

2006-11-28

Ha, Dac (Department: 2634)

Pulse or digital communications

Receivers

C375S264000

Reexamination Certificate

active

07142616

ABSTRACT:
An OFDM baseband signal that has undergone a synchronization carrier modulation or a differential carrier modulation is inputted to a complex signal converter for nonlinear distortion equalization so as to be converted according to the N-th order function conversion characteristics (N>1). Then, nonlinear distortion in the OFDM baseband signal is compensated for. At this time, the following is used as a conversion equation:in-line-formulae description="In-line Formulae" end="lead"?y(n)=x(n)+Σam(n)xm(n)(m>1)in-line-formulae description="In-line Formulae" end="tail"?wherein the values of the input signal, the output signal and the coefficient for m-th order distortion equalization at time n are, respectively, x(n), y(n) and am(n).

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Nishijima et al., “A Sub-Optimum Non-Linear Distortion Compensation Scheme for Orthogonal Multi-Carrier Modulation Systems”, Personal, Indoor and Mobile Radio Communications, Seventh IEEE International Symposium on Taipei, Taiwan, Oct. 15-18, 1996, pp. 45-48, vol. 1, IEEE, New York, USA.

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