Nonlinear system identification: an effective framework based on the Karhunen-Loève transform
IEEE Transactions on Signal Processing
Digital predistorters sensitivity to delay alignment resolution
RWS'09 Proceedings of the 4th international conference on Radio and wireless symposium
Look-up-table predistortion technique based on polynomial nonlinearity compensation in OFDM systems
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Adaptive order-decision method for memory polynomial based predistorters
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
On the numerical stability of RF power amplifier's digital predistortion
APCC'09 Proceedings of the 15th Asia-Pacific conference on Communications
A new power amplifier predistortion architecture based on memory polynomial model
ICICS'09 Proceedings of the 7th international conference on Information, communications and signal processing
Multichannel fast QR-decomposition algorithms: weight extraction method and its applications
IEEE Transactions on Signal Processing
RWS'10 Proceedings of the 2010 IEEE conference on Radio and wireless symposium
RWS'10 Proceedings of the 2010 IEEE conference on Radio and wireless symposium
Digital predistortion for power amplifiers using separable functions
IEEE Transactions on Signal Processing
A new approach to pruning volterra models for power amplifiers
IEEE Transactions on Signal Processing
A stochastic conjugate gradient method for the approximation of functions
Journal of Computational and Applied Mathematics
EUROCAST'11 Proceedings of the 13th international conference on Computer Aided Systems Theory - Volume Part II
Software-programmable digital pre-distortion on new generation FPGAs
Analog Integrated Circuits and Signal Processing
NSDI'14 Proceedings of the 11th USENIX Conference on Networked Systems Design and Implementation
Hi-index | 35.70 |
Conventional radio-frequency (RF) power amplifiers operating with wideband signals, such as wideband code-division multiple access (WCDMA) in the Universal Mobile Telecommunications System (UMTS) must be backed off considerably from their peak power level in order to control out-of-band spurious emissions, also known as "spectral regrowth." Adapting these amplifiers to wideband operation therefore entails larger size and higher cost than would otherwise be required for the same power output. An alternative solution, which is gaining widespread popularity, is to employ digital baseband predistortion ahead of the amplifier to compensate for the nonlinearity effects, hence allowing it to run closer to its maximum output power while maintaining low spectral regrowth. Recent improvements to the technique have included memory effects in the predistortion model, which are essential as the bandwidth increases. In this paper, we relate the general Volterra representation to the classical Wiener, Hammerstein, Wiener-Hammerstein, and parallel Wiener structures, and go on to describe some state-of-the-art predistortion models based on memory polynomials. We then propose a new generalized memory polynomial that achieves the best performance to date, as demonstrated herein with experimental results obtained from a testbed using an actual 30-W, 2-GHz power amplifier