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Spline-based behavioural model for efficient analysis of large front-ends for W-CDMA systems

Spline-based behavioural model for efficient analysis of large front-ends for W-CDMA systems

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A new behavioural model suitable for the analysis of RF front-ends for W-CDMA systems is described. The model fully accounts for both linear and nonlinear dispersion effects, so that relatively broadband digitally modulated signals can be accurately dealt with. The linear front-end response is computed by means of the conversion admittance matrix. The relationship between the linear and nonlinear responses is characterised by a voltage and frequency-dependent describing function. The latter is evaluated by a cubic-spline-based two-dimensional interpolation scheme starting from a database generated by harmonic-balance analysis. In this way, front-end simulations that would require months of CPU time even by modern envelope-oriented techniques, can be performed in a matter of seconds without significant loss of accuracy.

Inspec keywords: nonlinear network analysis; radio receivers; code division multiple access; splines (mathematics); electric admittance; interpolation; two-port networks; circuit simulation; describing functions; broadband networks

Other keywords: nonlinear dispersion effects; broadband digitally modulated signals; two-port nonlinear network; efficient analysis; harmonic-balance analysis; conversion admittance matrix; frequency conversion; two-dimensional interpolation; Krylov-subspace technique; linear dispersion effects; W-CDMA systems; large front-ends; spectral regrowth; frequency-dependent describing function; circuit-level simulation; spline-based behavioural model

Subjects: Interpolation and function approximation (numerical analysis); Numerical analysis; Communications computing; Electronic engineering computing; Computer-aided circuit analysis and design; Radio links and equipment; Multiple access communication; Interpolation and function approximation (numerical analysis); Nonlinear network analysis and design

References

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