Performance of a digital base-band predistorting amplifier linearizer implemented in fixed point DSPs

The application of digital predistortion in base-band signal is an extended method of amplifier linearization to reduce the adjacent channel interference (ACI) in those systems in which a varying envelope modulation scheme is used. This paper proposes a particular predistorter configuration and presents some design considerations and simulation results in relation to the use of fixed point digital signal processors (DSPs). Less than -60 dB out-of-band emission can be obtained for a narrow bandwidth system.

[1]  W. Struble,et al.  Understanding linearity in wireless communication amplifiers , 1996, GaAs IC Symposium IEEE Gallium Arsenide Integrated Circuit Symposium. 18th Annual Technical Digest 1996.

[2]  James K. Cavers,et al.  Simulation and analysis of an adaptive predistorter utilizing a complex spectral convolution , 1992 .

[3]  S. Kumar,et al.  Fast adaptive predistortion lineariser using polynomial functions , 1993 .

[4]  James K. Cavers.  Optimum indexing in predistorting amplifier linearizers , 1997, 1997 IEEE 47th Vehicular Technology Conference. Technology in Motion.

[5]  J. de Mingo,et al.  Amplifier linearization using a new digital predistorter for digital mobile radio systems , 1997, 1997 IEEE 47th Vehicular Technology Conference. Technology in Motion.

[6]  C. G. Englefield,et al.  Power amplifier linearization using cubic spline interpolation , 1993, IEEE 43rd Vehicular Technology Conference.

[7]  Shawn Patrick Stapleton,et al.  An adaptive predistorter for a power amplifier based on adjacent channel emissions (mobile communications) , 1992 .

[8]  J. Cavers,et al.  An adaptive direct conversion transmitter , 1992, [1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology.

[9]  Michael Faulkner,et al.  Adaptive linearization using predistortion-experimental results , 1994 .

[10]  Shawn Patrick Stapleton,et al.  An adaptive direct conversion transmitter , 1994 .

[11]  Y. Nagata,et al.  Linear amplification technique for digital mobile communications , 1989, IEEE 39th Vehicular Technology Conference.

[12]  James K. Cavers,et al.  Amplifier linearization using a digital predistorter with fast adaptation and low memory requirements , 1990 .

[13]  Michael Faulkner,et al.  Quantization analysis and design of a digital predistortion linearizer for RF power amplifiers , 1996 .

[14]  A. S. Wright,et al.  Experimental performance of an adaptive digital linearized power amplifier (for cellular telephony) , 1992 .

[15]  S. Maas.  Volterra analysis of spectral regrowth , 1997 .