Title :
Nonlinear tapped delay line digital predistorter for power amplifiers with memory
Author :
Nizamuddin, Muhammad A. ; Balister, Philip J. ; Tranter, William H. ; Reed, Jeffrey H.
Author_Institution :
Mobile & Portable Radio Res. Group, Virginia Polytech. Inst. & State Univ., USA
Abstract :
Current bandwidth-efficient modulated signals are significantly distorted during nonlinear amplification. Memoryless digital predistortion is a cost-effective method to compensate for such distortion caused by a nonlinear amplifier. However, significant frequency-dependent effects in high power, wideband nonlinear amplifiers operating on signals such as multicarrier WCDMA reduce the effectiveness of memoryless predistortion and thus cancellation of memory effects is necessary. In this paper, we have presented a nonlinear tapped delay line (NTDL) predistorter structure with memory compensation as well as indirect learning capability, and demonstrated its performance for a 2-carrier WCDMA signal.
Keywords :
broadband networks; code division multiple access; compensation; delay lines; digital circuits; nonlinear distortion; power amplifiers; wideband amplifiers; 2-carrier WCDMA signal; bandwidth-efficient modulated signal; cost-effective method; frequency-dependent effect; indirect learning capability; memory compensation; memoryless digital predistortion; multicarrier WCDMA; nonlinear amplification; nonlinear amplifier; nonlinear tapped delay line digital predistorter; power amplifier; Bandwidth; Base stations; Broadband amplifiers; Delay lines; Digital modulation; Frequency; Multiaccess communication; Nonlinear distortion; Power amplifiers; Predistortion;
Conference_Titel :
Wireless Communications and Networking, 2003. WCNC 2003. 2003 IEEE
Conference_Location :
New Orleans, LA, USA
Print_ISBN :
0-7803-7700-1
DOI :
10.1109/WCNC.2003.1200419
