An efficient crest factor reduction technique for wideband applications

Abstract

This paper describes a new efficient crest factor reduction technique for wideband applications. The technique is based on using peak cancellation to reduce the peak-to-average power ratio (PAPR) of the input signal. Conventional iterative peak cancellation requires several iterations so as to converge into the targeted PAPR, since filtering causes peak re-growth. The proposed algorithm is able to eliminate several iterations, which subsequently saves hardware resources. In numerical simulations using four WCDMA carriers, it achieves a PAPR of 5.7 dB with a fixed EVM of 10%. A 240 W PEP Class AB power amplifier was utilized to verify the performance of the proposed technique and demonstrate the efficiency gains. The measured results demonstrate that this algorithm can enhance the efficiency of our PA by up to 6.6%, when compared to the efficiency without the PAPR technique.

An Upgraded Dual-Band Digital Predistorter Model for Power Amplifiers Linearization

“…The dual-band probing signal was composed by two orthogonal frequency division multiplexing (OFDM) signals according to the 5G-NR standard, each with 20 MHz bandwidth and 30 kHz separation between subcarriers, and both bands had a separation of 80 MHz. It is worth mentioning that the original PAPR of the combined signal was lowered to 10 dB using CFR techniques in order not to exceed the measurement setup restrictions [16]. The average output power was 27.7 dBm and the normalized mean squared error (NMSE) between the input and output signals without predistortion presented a value of −20.9 dB.…”

Preparing Linearity and Efficiency for 5G: Digital Predistortion for Dual-Band Doherty Power Amplifiers with Mixed-Mode Carrier Aggregation

“…To control the PAPR and ensure stable performance across the range of possible input signals we employ a two stage PAPR reduction solution based on the scaled peak cancellation method (SPC) outlined in [20]. Figure 7 illustrates the basic operation of SPC, the signal is composed of all components of the input that are greater than the chosen clipping threshold.…”

Amping Up, Saving Power: Digital Predistortion Linearization Strategies for Power Amplifiers Under Wideband 4G\/5G Burst-Like Waveform Operation

“…CFR has been used as protection to minimize the effects of having a signal with PAPR larger than the statistical mean value at which the predistorter has been previously trained during final tests (to avoid highly penalizing ACPR degradation). The peak cancellation (PC) technique described in [17] has been chosen as a clipping and filtering CFR method.…”